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Chemistry M.C.Q (1 Marks)

The s-block Elements · MP Board (MPBSE) STD 11 Science (Madhya Pradesh - English Medium). 191 questions.

Questions · Page 3 of 4

M.C.Q (1 Marks)

MCQ 1011 Mark
Colour of solution prepared by dissolution of alkaline earth metal in ammonia solution, is :
  • A
    Blue.
  • ✓
    Deep blue black.
  • C
    Bbronze.
  • D
    Brown.
Answer
Correct option: B.
Deep blue black.
$\text{M}+(\text{x}+\text{y})\text{NH}_3\xrightarrow{ \ \ \ \ \ \ \ }[\text{M(NH}_3)_\text{x}]^{2+}+2[\text{e(NH}_3)_\text{y}]^-$
Alkaline earth metals dissolve in liquid ammonia to give deep blue black coloured solution.
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MCQ 1031 Mark
The addition of limited amount of water breaks the lump of lime. This process is called :
  • A
    Electrolysis of lime.
  • B
    Hydrolysis of lime.
  • ✓
    Slaking of lime.
  • D
    None of the above.
Answer
Correct option: C.
Slaking of lime.
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MCQ 1041 Mark
A chemical $A$ is used for the preparation of washing soda to recover ammonia. When $\ce{CO_2}$ is bubbled through an aqueous solution of $A$, the solution tons milky. It is used in white washing due to disinfectant nature. What is the chemical formula of $A$?
  • A
    $\ce{Ca(CO_3)_2}$
  • B
    $\ce{CaO}$
  • ✓
    $\ce{Ca(OH)_2}$
  • D
    $\ce{CaCO_3}$
Answer
Correct option: C.
$\ce{Ca(OH)_2}$
$2\text{NH}_4\text{Cl}+\text{Ca}(\text{OH})_2\xrightarrow{\ \ \ \ }2\text{NH}_3+\text{CaCl}_2+2\text{H}_2\text{O}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(Recovery of NH}_3)$
$\text{CO}_2+\text{Ca}(\text{OH})_2\xrightarrow{\ \ \ \ \ }\text{CaCO}_3+\text{H}_2\text{O}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(Milky)}$
It is used in white washing due to its disinfectant nature.
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MCQ 1051 Mark
Which mineral is neccessary for blood clotting?
  • ✓
    Calcium
  • B
    Magnese
  • C
    Phosphorus
  • D
    Iron
Answer
Correct option: A.
Calcium
Calcium plays an important role in the coagulation of blood $($blood clotting$)$. An increased concentration of calcium in the platelets helps in activating various proteins important for blood clotting and thus, results in the formation of a blood clot. It helps in the binding of clotting enzymes to phospholipids in platelets and tissue and accelerates the reaction.
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MCQ 1061 Mark
On heating in air, sodium burns violently with golden yellow flame forming:
  • A
    monoxide and hydroxide
  • ✓
    monoxide and carbonate
  • C
    peroxide and hydroxide
  • D
    monoxide and peroxide
Answer
Correct option: B.
monoxide and carbonate
Reaction of process:
$\mathrm{Na}+$ air $\rightarrow \mathrm{Na}_2 \mathrm{O}+\mathrm{Na}_2 \mathrm{O}_2 ($pale yellow$)$
$2 \mathrm{Na}_2 \mathrm{O}_2+2 \mathrm{CO}_2 \rightarrow \mathrm{Na}_2 \mathrm{CO}_3+\mathrm{O}_2$
 
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MCQ 1071 Mark
Some of the Group $2$ metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is:
  • ✓
    $\ce{BeCl_2}$
  • B
    $\ce{MgCl_2}$
  • C
    $\ce{CaCl_2}$
  • D
    $\ce{SrCl_2}$
Answer
Correct option: A.
$\ce{BeCl_2}$
$\ce{BeCl_2}$ has covalent character because of small size and high effective nuclear charge. Being covalent in nature it is dissolved in ethanol.
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MCQ 1081 Mark
The ionic mobility is lowest in which of the following?
  • A
    $k$
  • B
    $Rb$
  • ✓
    $Li$
  • D
    $Na$
Answer
Correct option: C.
$Li$
$Li^{+}$ has lowest mobility because it is most hydrated.
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MCQ 1091 Mark
Identify the elements having same valence shell.
  • ✓
    $P$ and $Q$
  • B
    $Q$ and $R$
  • C
    $P$ and $R$
  • D
    $P, Q$ and $R$
Answer
Correct option: A.
$P$ and $Q$
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MCQ 1101 Mark
Which of the following can form a super oxide very easily?
  • A
    Sodium
  • B
    Potassium
  • ✓
    Caesium
  • D
    Lithium
Answer
Correct option: C.
Caesium
The size of the atoms increases as we move down the group from lithium to caesium. Caesium cation has a large ionic size.
Similarly, the superoxide ion has a large ionic size. These ions form a stable lattice by efficient packing of ions.
Hence, caesium can form superoxide very easily.
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MCQ 1111 Mark
Alkali metals are kept in kerosene oil. Which of the following reason$(s)$ is$/$ are correct regarding this statement?
  • ✓
    Due to high reactivity of alkali metal.
  • B
    Due to high ionisation enthalpy of alkali metals.
  • C
    Due to large size of alkali metals.
  • D
    Both $(a)$ and $(b)$.
Answer
Correct option: A.
Due to high reactivity of alkali metal.
Because of their high reactivity towards air and water, alkali metals are kept in kerosene oil.
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MCQ 1121 Mark
Calcium oxide is prepared by heating :
  • A
    $\ce{CaCO_3}$ in Castner$-$Kellner cell.
  • ✓
    $\ce{CaCO_3}$ in rotary kiln.
  • C
    $\ce{Ca(HCO_3)_2}$ in rotary kiln.
  • D
    $\ce{Ca(HCO_3)_2}$ in Castner$-$Kellner cell.
Answer
Correct option: B.
$\ce{CaCO_3}$ in rotary kiln.
Calcium oxide is prepared on a commercial scale by heating $\ce{CaCO_3}$ in a rotary kiln at $1070$ to $1270K.$
$\text{CaCO}_3\xrightarrow[1070-1270^\circ\text{C}]{ \ \ \ \ \text{Heat} \ \ \ \ }\text{CaO}+\text{CO}_2$
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MCQ 1131 Mark
$Li$ and $Mg$ resembles each other because
  • A
    both are $s-$block elements
  • B
    both are metals
  • ✓
    both have almost same periodic properties
  • D
    they have same electronic configuration
Answer
Correct option: C.
both have almost same periodic properties
Due to its small size, lithium differs from other alkali metals but resembles with $Mg$ as its size and other periodic properties are closer to $Mg$. Its resemblance with $Mg$ is known as diagonal relationship.
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MCQ 1141 Mark
Molten sodium is used in nuclear reactors to:
  • A
    Absorb neutrons in order to control the chain reaction
  • B
    Slow down the fast neutrons
  • ✓
    Absorb the heat generated by nuclear fission
  • D
    Extract radio$-$isotopes produced in the reactor
Answer
Correct option: C.
Absorb the heat generated by nuclear fission
Molten sodium is used in nuclear reactors due to its high thermal conductivity properties, it is used as a coolant i.e. to absorb the heat produced during nuclear fission.
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MCQ 1151 Mark
Beryllium and aluminum exhibit many properties which are similar. But the two elements differ in :
  • ✓
    Maximum covalency in compounds
  • B
    Exhibiting amphoteric nature in their oxides
  • C
    Forming covalent halides
  • D
    Forming polymeric hydrides
Answer
Correct option: A.
Maximum covalency in compounds
Be exhibits maximum covalency of four whereas $Al$ shows maximum covalency of six.
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MCQ 1161 Mark
Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is :
  • ✓
    Both form basic carbonates.
  • B
    Both form soluble bicarbonates.
  • C
    Both form nitrides.
  • D
    Nitrates of both $Li$ and $Mg$ yield $\ce{NO_2}$​ and $O_2$​ on heating.
Answer
Correct option: A.
Both form basic carbonates.
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MCQ 1171 Mark
Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?
  • A
    $ \mathrm{MgCO}_3 $
  • B
    $ \mathrm{CaCO}_3 $
  • C
    $ \mathrm{SrCO}_3 $
  • ✓
    $ \mathrm{BaCO}_3 $
Answer
Correct option: D.
$ \mathrm{BaCO}_3 $
Thermal stability of $\ce{MCO_3}$ group depends on the $MO$. If $MO$ is stable $\ce{MCO_3}$ is thermally unstable and vice versa.
$\text{MCO}_3\xrightarrow{}\text{MO}+\text{CO}_2.$ Thermal stability of $MO$ decreases as the size of $M$ increases.
Therefore, $\ce{BaO}$ is least stable and $ \mathrm{BaCO}_3 $ is most stable.
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MCQ 1181 Mark
Potassium ions are most abundant in the cell fluid. Which of the following reaction is performed by the potassium ion present in them?
  • A
    They perform oxidation of glucose to $\ce{ATP}$.
  • B
    They perform nerve signals transmission.
  • ✓
    Both $(a)$ and $(b)$ are true.
  • D
    None of the above.
Answer
Correct option: C.
Both $(a)$ and $(b)$ are true.
$K^+$ ions present in fluid of cell are used in the oxidation of glucose to produce $\text{ATP}$ and transmission of nerve signals.
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MCQ 1191 Mark
In the following, the element with the highest electropositivity is :
  • A
    copper
  • ✓
    caesium
  • C
    barium
  • D
    chromium
Answer
Correct option: B.
caesium
Caesium $(Cs)$ is most electropositive in character, as it has the highest tendency to loose an electron from its outermost shell to achieve a stable fully filled configuration.
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MCQ 1201 Mark
Which of the following metal does not react with water?
  • ✓
    Beryllium
  • B
    Copper
  • C
    Iron
  • D
    Potassium
Answer
Correct option: A.
Beryllium
Beryllium $(Be)$ is the only alkaline earth metal that does not react with water. This is due to its small size and high ionization energy in relation to the other elements in the group.
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MCQ 1211 Mark
Which of the following property of alkali metals increases with increase in atomic number?
  • ✓
    Ionic radius
  • B
    Electronegativity
  • C
    Melting point
  • D
    First ionisation potential
Answer
Correct option: A.
Ionic radius
With the increase in the atomic number of alkali metals, the ionic radius increases due to the increase in the number of the shell, whereas the electronegativity, melting point and first ionization potential decrease.
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MCQ 1221 Mark
Which of the following has lowest melting point?
  • A
    $\ce{CaCl_2}$
  • B
    $\ce{CaBr_2}$
  • ✓
    $\ce{Cal_2}$
  • D
    $\ce{CaF_2}$
Answer
Correct option: C.
$\ce{Cal_2}$
It is due large 'I' atom, least lattice enthalpy.
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MCQ 1231 Mark
Which element is present in blood plasma in larger quantity?
  • ✓
    Sodium
  • B
    Potassium
  • C
    Iron
  • D
    Copper
Answer
Correct option: A.
Sodium
Sodium is present in blood plasma in larger quantity. It is present in extracellular fluid and interstitial fluids.
Hence, even though sodium diffuses into the cell due to the concentration gradient, there is a sodium pump which pushes it back again.
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MCQ 1241 Mark
Pick out the false statement :
  • A
    the electropostive character of alkali metals decreases with increases in atomic number
  • B
    lithium is a hard metal and cannot be cut with a knife
  • C
    Alkali metals are strong reducing agents
  • ✓
    the electro$-$negativities of all alkali metals remain the same.
Answer
Correct option: D.
the electro$-$negativities of all alkali metals remain the same.
With increase in the atomic number, the electropositive character increases in alkali metals.
Thus $Li$ is least electropositve and $Cs$ is most electropositive among alkali metals.
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MCQ 1251 Mark
Which of the following metal sulphide is water soluble?
  • ✓
    $\ce{CaS}$
  • B
    $\ce{ZnS}$
  • C
    $\ce{HgS}$
  • D
    $\ce{CdS}$
Answer
Correct option: A.
$\ce{CaS}$
Calcium sulphide, $\ce{CaS}$ and zinc sulphide $\ce{ZnS}$ are slightly soluble in water.
Cadmium sulphide $\ce{CdS}$ and mercury $(II)$ sulfide are insoluble in water.
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MCQ 1261 Mark
Which of the following exist as decahydrate?
  • A
    Caustic soda.
  • ✓
    Washing soda.
  • C
    Baking soda.
  • D
    Both $(b)$ and $(c).$
Answer
Correct option: B.
Washing soda.
Washing soda occurs as decahydrate. Molecular formula of washing soda is $\ce{Na_2CO_3 .10H_2O}$.
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MCQ 1271 Mark
The lightest metal among the following is:
  • A
    $Cs$
  • B
    $Be$
  • C
    $Na$
  • ✓
    $Li$
Answer
Correct option: D.
$Li$
$Li$ is the lightest metal because it is placed in first group of periodic table i.e. in alkali metal group and it has the lowest atomic number.
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MCQ 1281 Mark
Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?
  • A
    $\ce{MgCO_3}$
  • B
    $\ce{CaCO_3}$
  • C
    $\ce{SrCO_3}$
  • ✓
    $\ce{BaCO_3}$
Answer
Correct option: D.
$\ce{BaCO_3}$
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MCQ 1291 Mark
he most active metal is:
  • A
    $Be$
  • B
    $Ca$
  • ✓
    $Ba$
  • D
    $Mg$
Answer
Correct option: C.
$Ba$
On moving down the group, the electropositive character increases. Hence, the chemical reactivity also increases from $Be$ to $Ba$.
Therefore, the most active metal in alkaline earth metal is barium $(Ba)$.
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MCQ 1301 Mark
Which of the following is commonly known as washing soda?
  • ✓
    $\ce{Na_2CO_3 .10H_2O}$
  • B
    $\ce{Na_2CO_3.7H_2O}$
  • C
    $\ce{NaHCO_3.10H_2O}$
  • D
    $\ce{NaHCO_3.7H_2O}$
Answer
Correct option: A.
$\ce{Na_2CO_3 .10H_2O}$
Molecular formula of washing soda is $\ce{Na_2CO_3 .10H_2O}$.
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MCQ 1311 Mark
Property of all the alkaline earth metals that increases with their atomic number is:
  • A
    solubility of their carbonates
  • ✓
    thermal stability of their sulphates
  • C
    ionisation energy
  • D
    electronegativity
Answer
Correct option: B.
thermal stability of their sulphates
Down the group, the thermal stability of group $2$ sulphates increases with their atomic number. This is due to the fact that higher the atomic number, larger the ionic radius and lesser the charge density. So it causes less distortion to nearby negative charge, so the bond formed between the cation and anion will be strong and stable.
Rest all the given properties decreases while going down the group.
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MCQ 1321 Mark
The properties of $Li$ are similar to those of $Mg$. This is because:
  • A
    both have nearly the same size.
  • ✓
    both has their charge to size ratio nearly the same.
  • C
    both have similar electronic configurations.
  • D
    both are found together in nature.
Answer
Correct option: B.
both has their charge to size ratio nearly the same.
The properties of lithium are similar to those of $Mg$ because they are having diagonal relationship.
The elements having diagonal relationship show similar properties and the reason is because the both of them will have similar electronegativity and polarising power i.e. charge per size ratio of both the elements are nearly the same.
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MCQ 1331 Mark
Which of the following is a covalent oxide?
  • ✓
    $\ce{BeO}$
  • B
    $\ce{CaO}$
  • C
    $\ce{SrO}$
  • D
    $\ce{BaO}$
Answer
Correct option: A.
$\ce{BeO}$
$\ce{BeO}$ is a covalent oxide because of the small size of beryllium and electronegativity difference between $Be$ and $O$.
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MCQ 1341 Mark
Which among the following elements of group$-2$ exhibit anomalous properties?
  • ✓
    $Be$
  • B
    $Mg$
  • C
    $Ca$
  • D
    $Ba$
Answer
Correct option: A.
$Be$
Be exhibit anomalous properties. This is due to smaller atomic and ionic radii of beryllium as compared to other group members.
It is also due to the higher electronegativity of $Be$.
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MCQ 1351 Mark
Which among the following statements is incorrect for magnesium metal?
  • A
    It burns in oxygen with a dazzling white flame
  • ✓
    It reacts with cold water to form magnesium oxide and evolves hydrogen gas
  • C
    It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas
  • D
    It reacts with steam to form magnesium hydroxide and evolves hydrogen gas
Answer
Correct option: B.
It reacts with cold water to form magnesium oxide and evolves hydrogen gas
Magnesium never reacts with cold water. It only reacts with hot water or steam to form its hydroxide and hydrogen gas is evolved.
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MCQ 1361 Mark
The low solubility of $\ce{LiF}$ and $\ce{Css}$ is due to:
  • A
    Smaller lattice enthalpy, high hydration enthalpy.
  • B
    High lattice enthalpy, smaller hydration enthalpy.
  • ✓
    High lattice enthalpy, high hydration enthalpy.
  • D
    Low lattice enthalpy, low hydration enthalpy.
Answer
Correct option: C.
High lattice enthalpy, high hydration enthalpy.
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MCQ 1371 Mark
Among the following which can form ions with $a2^+$ charge?
  • A
    Alkali metal
  • ✓
    Alkaline earth metal
  • C
    Halogen
  • D
    Noble gas
Answer
Correct option: B.
Alkaline earth metal
Alkaline earth metals have $2$ electron in their outermost orbital,after donating these two electron stable state can be achieved with fully occupied outermost orbital. so Alkaline earth metals can form ions with a $2^+$ charge.
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MCQ 1381 Mark
Bones and teeth contain:
  • ✓
    Calcium dihydrogen phosphate
  • B
    Apatite
  • C
    Calcium phosphide
  • D
    None of the above
Answer
Correct option: A.
Calcium dihydrogen phosphate
Bones and teeth contains Apatite which is a group of phosphate minerals and contains calcium.
Its formula can be represented as $\ce{Ca_5 (PO_4 ​)_3 (F, Cl, OH).}$
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MCQ 1391 Mark
Which member of $\ce{IIA}$ group shows covalency?
  • A
    $Ba$
  • ✓
    $Be$
  • C
    $Sr$
  • D
    $Mg$
Answer
Correct option: B.
$Be$
$Be$ shows covalency. Due to small size, can't ionize easily and high charge density on $Be$, its polarizing power is maximum, since $Be^{2+}$ essentially pull the electrons cloud with other elements rather than lose electrons.
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MCQ 1401 Mark
Both lithium and magnesium display similar properties due to the diagonal relationship; however, the one which is incorrect, is:
  • A
    Both form nitrides
  • B
    Nitrates of both $Li$ and $Mg$ yield $\ce{NO_2}$  and $\ce{O_2}$  on heating
  • ✓
    Both from basic carbonates
  • D
    Both form soluble bicarbonates
Answer
Correct option: C.
Both from basic carbonates
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MCQ 1411 Mark
What happens when too much of sodium is in your diet?
  • A
    Cancer
  • B
    Damage nerve function
  • ✓
    Risk factor for heart disease
  • D
    Digestio
Answer
Correct option: C.
Risk factor for heart disease
As sodium accumulates, the body holds onto water to dilute the sodium. This increases both the amount of fluid surrounding cells and the volume of blood in the bloodstream. Increased blood volume means more work for the heart and more pressure on blood vessels. Over time, the extra work and pressure can stiffen blood vessels, leading to high blood pressure, heart attack, and stroke. It can also lead to heart failure.
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MCQ 1421 Mark
Which element has highest concentration in $\ce{RBC}$ ?
  • ✓
    Iron
  • B
    Potassium
  • C
    Sodium
  • D
    Copper
Answer
Correct option: A.
Iron
$\ce{RBCs}$ contain hemoglobin which is red in colour due to presence of Iron.
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MCQ 1431 Mark
What supports proper nerve functioning?
  • ✓
    Sodium
  • B
    Magnesium
  • C
    Calcium
  • D
    Iron
Answer
Correct option: A.
Sodium
Sodium performs a lot of important functions for our body. One of them to aid proper nerve functioning. Thus, the right answer is sodium.
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MCQ 1441 Mark
The hydration enthalpies of alkali metal ions decrease with increase-in ionic size. Which of the following ions has maximum degree of hydration?
  • A
    $Na^+$
  • B
    $K^+$
  • ✓
    $Li^+$
  • D
    $Cs^+$
Answer
Correct option: C.
$Li^+$
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MCQ 1451 Mark
Alkali metals show regular trend in their physical and chemical properties with the:
  • ✓
    Increasing atomic number.
  • B
    Increasing $s-$electrons.
  • C
    Decreasing atomic number.
  • D
    None of the above.
Answer
Correct option: A.
Increasing atomic number.
The alkali metals show regular trend in their physical and chemical properties with the increasing atomic number.
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MCQ 1461 Mark
Which of the following is used as antacid in medicine?
  • A
    Suspension of magnesium carbonate in water.
  • ✓
    Suspension of hydroxide of magnesium in water.
  • C
    Suspension of hydroxide of calcium in water
  • D
    Suspension of calcium carbonate in water.
Answer
Correct option: B.
Suspension of hydroxide of magnesium in water.
Magnesium hydroxide dissolved in water is known as milk of magnesia. It is used as an antacid in medicine.
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MCQ 1471 Mark
In context of $Be$, which one of the following statement is incorrect?
  • A
    It is rendered passive be $\ce{HNO_3}$.
  • B
    It form $\ce{Be_2C}$.
  • ✓
    Its salts rarely hydrolyse.
  • D
    Its hydride is electron deficient and polymeric.
Answer
Correct option: C.
Its salts rarely hydrolyse.
Its salts are covalent and get easily hydrolysed.
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MCQ 1491 Mark
Which of the following is$/$ are present as impurity in crude sodium chloride?
  • A
    Magnesium chloride.
  • B
    Calcium chloride.
  • C
    Sodium sulphate.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
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MCQ 1501 Mark
The softness of group $IA$ metals increases down the group because:
  • ✓
    The metallic bond strength decreases with increase in atomic size
  • B
    Ionisation potential decreases from $Li$ to $Cs$
  • C
    Electronegativity increases from $Li$ to $Cs$
  • D
    Atomic size decreases from $Li$ to $Cs$
Answer
Correct option: A.
The metallic bond strength decreases with increase in atomic size
Alkali metals have large atomic size. The close packing of atoms is weak. Hence, they are soft. As the atomic size increases on moving down the group, the strength of the metallic bonds decreases.
Hence, the softness of alkali metals increases on moving down the group.
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