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Science M.C.Q

Metals and Non-Metals · Maharashtra Board STD 10 (MSBSHSE - Semi English Medium). 75 questions.

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MCQ 11 Mark
The atomic numbers of four elements $\ce{A, B, C}$ and $\ce{D}$ are $6, 8, 10$ and $12$ respectively. The two elements which can react to form ionic bonds $($or ionic compound$)$ are:
  • A
    $A$ and $D$
  • B
    $B$ and $C$
  • C
    $A$ and $C$
  • ✓
    $B$ and $D$
Answer
Correct option: D.
$B$ and $D$
Element $B$ has the electronic configuration of $2, 6.$ It requires $2$ electrons to complete its octet. On the other hand, element $D$ has the electronic configuration of $2, 8, 2.$ It requires to release $2$ electrons to complete its octet.
Thus, both atoms react to form ionic bonds by transfer of electrons.
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MCQ 21 Mark
An important ore of zinc metal is:
  • ✓
    Calamine.
  • B
    Cuprite.
  • C
    Hyrolusite.
  • D
    Haematite.
Answer
Correct option: A.
Calamine.
Calamine is an ore of zinc and the compound is zinc carbonate $\ce{(ZnCO_3)}$.
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MCQ 31 Mark
The number of protons in one atom of an element $X$ is $8$. What will be the number of electrons in its ion $x^{2-}$
  • A
    $8$
  • B
    $9$
  • ✓
    $10$
  • D
    $11$
Answer
Correct option: C.
$10$
Number of protons is equal to the number of electrons in an atom. It is given that one atom of an element $X$ contains $8$ electrons.
Therefore, number of electrons in its ion $x^{2-}=10+2=12$
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MCQ 41 Mark
Which of the following non$-$metal is a liquid?
  • A
    Carbon.
  • B
    Sulphur.
  • ✓
    Bromine.
  • D
    Iodine.
Answer
Correct option: C.
Bromine.
Bromine is the non$-$metal that is a liquid.
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MCQ 51 Mark
The noble gas having only two electrons in its valence shell is:
  • A
    $Ar$
  • B
    $Ne$
  • ✓
    $He$
  • D
    $Kr$
Answer
Correct option: C.
$He$
Atomic number of helium is $2.$ It contains $2$ electrons in its atom.
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MCQ 61 Mark
In stainless steel alloy, iron metal is mixed with:
  • A
    $Cu$ and $Cr$
  • ✓
    $Cr$ and $Ni$
  • C
    $Cr$ and $Sn$
  • D
    $Cu$ and $Ni$
Answer
Correct option: B.
$Cr$ and $Ni$
Stainless steel is an alloy of iron, chromium and nickel. It is extremely strong and tough and does not corrode at all.
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MCQ 71 Mark
Which of the following is an ore of mercury metal?
  • A
    Rock salt.
  • ✓
    Cinnabar.
  • C
    Calamine.
  • D
    Haematite.
Answer
Correct option: B.
Cinnabar.
Cinnabar is an important ore of mercury. Its compound is mercury $(II)$ sulphide $\ce{(HgS)}.$
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MCQ 81 Mark
Element $X$ reacts with element $Y$ to form a compound $Z.$ During the formation of compound $Z,$ atoms of $X$ lose one electron each whereas atoms of $Y$ gain one electron each. Which of the following property is not shown by compound $Z?$
  • A
    High melting point.
  • ✓
    Low melting point.
  • C
    Occurrence as solid.
  • D
    Conduction of electricity in molten state.
Answer
Correct option: B.
Low melting point.
Compound $Z$ is an ionic compound formed by transfer of electrons. Ionic compounds have high melting points.
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MCQ 91 Mark
The two metals which can be extracted just by heating their sulphides in air are:
  • A
    Sodium and copper.
  • B
    Copper and aluminium.
  • C
    Potassium and zinc.
  • ✓
    Mercury and copper.
Answer
Correct option: D.
Mercury and copper.
Both mercury and copper are less reactive metals and are placed low in the reactivity series.
Hence, they can be extracted by heating their sulphides in air and further reducing their oxides by heating.
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MCQ 101 Mark
An ore of manganese metal is:
  • A
    Bauxite.
  • B
    Haematite.
  • C
    Cuprite.
  • ✓
    Pyrolusite.
Answer
Correct option: D.
Pyrolusite.
Pyrolusite is an ore of manganese and the compound is manganese dioxide $\ce{(MnO_2)}$.
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MCQ 111 Mark
A covalent molecule having a double bond between its atoms is:
  • A
    Hydrogen.
  • ✓
    Oxygen.
  • C
    Water.
  • D
    Ammonia.
Answer
Correct option: B.
Oxygen.
In an oxygen molecule, each oxygen atom shares its $2$ electrons to complete its octet and forms double covalent bond between them.
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MCQ 121 Mark
Calamine ore can be converted into zinc oxide by the process of:
  • A
    Dehydration.
  • B
    Roasting.
  • ✓
    Calcination.
  • D
    Sulphonation.
Answer
Correct option: C.
Calcination.
Calamine $(\ce{ZnCO_3}$, zinc carbonate$)$ is a carbonate ore of zinc. Carbonate ores are converted to metal oxides by calcination $($heating in the absence of air$)$. When calamine ore $($zinc carbonate$)$ is heated in the absence of air, it is converted into zinc oxide.
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MCQ 131 Mark
Which of the following metals can be obtained from haematite ore?
  • A
    Copper.
  • B
    Sodium.
  • C
    Zinc.
  • ✓
    Iron.
Answer
Correct option: D.
Iron.
Iron can be obtained from hematite ore. Hematite ore contains the compound iron $(III)$ oxide $\ce{(Fe_2O_3)}$.
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MCQ 141 Mark
The metal which can be extracted simply by heating the cinnabar ore in air is:
  • A
    $Zn$
  • B
    $Cu$
  • C
    $Al$
  • ✓
    $Hg$
Answer
Correct option: D.
$Hg$
Mercury is a low reactive metal. Thus, it can be extracted from its ore cinnabar, $\ce{HgS},$ by heating it in air.
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MCQ 151 Mark
Rock salt is an ore of one of the following metals. This metal is:
  • A
    $Mn$
  • ✓
    $Na$
  • C
    $Fe$
  • D
    $Cu$
Answer
Correct option: B.
$Na$
Rock salt is a chloride ore of sodium. The name of the compound in the ore is sodium chloride with chemical formula $\ce{NaCl}.$
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MCQ 161 Mark
The rechargeable battery used in a mobile phone hand set is usually:
  • A
    Lead ion battery.
  • B
    Sodium ion battery.
  • C
    Hydrogen ion battery.
  • ✓
    Lithium ion battery.
Answer
Correct option: D.
Lithium ion battery.
Because lithium ion is a good conductor of electricity.
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MCQ 171 Mark
An element $E$ reacts with water to form a solution which turns phenolphthalein solution pink. The element $E$ is most likely to be:
  • A
    $S$
  • ✓
    $Ca$
  • C
    $C$
  • D
    $Ag$
Answer
Correct option: B.
$Ca$
Calcium is the metal that can react with water to form calcium hydroxide, which is basic in nature.
Hence it turns phenolphthalein solution pink.
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MCQ 181 Mark
One of the following contains a double bond as well as single bonds. This is:
  • A
    $CO_2$
  • B
    $O_2$
  • ✓
    $C_2H_4$
  • D
    $C_2H_2$
Answer
Correct option: C.
$C_2H_4$
An ethene molecule $\ce{(C_2H_4)}$ contains one double bond between two carbon atoms and four single bonds between carbon and hydrogen atoms.
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MCQ 191 Mark
The elements whose oxides can turn litmus solution blue are:
  • A
    Carbon and sulphur.
  • B
    Sodium and carbon.
  • ✓
    Potassium and magnesium.
  • D
    Magnesium and sulphur.
Answer
Correct option: C.
Potassium and magnesium.
Potassium and magnesium are metals whose oxides are basic in nature. These oxides turn red litmus solution to blue.
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MCQ 201 Mark
An element $X$ reacts with hydrogen, when heated, to form a covalent hydride $\ce{H_2X}$. If $\ce{H_2X}$ has a smell of rotten eggs, the element $X$ is likely to be:
  • A
    Carbon.
  • ✓
    Sulphur.
  • C
    Chlorine.
  • D
    Phosphorus.
Answer
Correct option: B.
Sulphur.
Because sulphur reacts with hydrogen to form a covalent hydride, $\ce{H_2S}$ that has the smell of rotten eggs.
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MCQ 211 Mark
A common metal which is highly resistant to corrosion is:
  • A
    Iron.
  • B
    Copper.
  • ✓
    Aluminium.
  • D
    Magnesium.
Answer
Correct option: C.
Aluminium.
Aluminium is resistant to corrosion due to the formation of a thin oxide layer $($aluminium oxide or $\ce{Al_2O_3).}$ This prevents further corrosion by creating a strong protective layer over the surface of the metal.
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MCQ 221 Mark
The electronic configurations of three elements $X, Y$ and $Z$ are:
$X : 2$
$Y : 2, 8, 7$
$Z : 2, 8, 2$
Which of the following is correct regarding these elements?
  • A
    $X$ is a metal.
  • B
    $Y$ is a metal.
  • C
    $Z$ is a non$-$metal.
  • ✓
    $Y$ is a non$-$metal and $Z$ is a metal.
Answer
Correct option: D.
$Y$ is a non$-$metal and $Z$ is a metal.
Element $Y$ has $1$ less electron to complete its octet which is a property of non$-$metals. On the other hand, element ​$Z$ has $2$ extra electrons to become stabilised which is a property of metals.
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MCQ 231 Mark
Which of the following alloys contains mercury as one of the constituents?
  • A
    Stainless steel.
  • B
    Solder.
  • C
    Duralumin.
  • ✓
    Zinc amalgam.
Answer
Correct option: D.
Zinc amalgam.
Generally, alloys containing mercury as one of its constituents are known as amalgam. Zinc amalgam is an alloy of zinc and liquid mercury.
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MCQ 241 Mark
Which of the following pair of metals exists in their native state in nature?
  • A
    $Ag$ and $Hg.$
  • B
    $Ag$ and $Zn.$
  • C
    $Au$ and $Hg.$
  • ✓
    $Au$ and $Ag.$
Answer
Correct option: D.
$Au$ and $Ag.$
Gold $(Au)$ and silver $(Ag)$ are highly non$-$reactive. Hence, they are available in native state in nature and do not react with oxygen or any other element in the atmosphere.
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MCQ 251 Mark
The elements whose oxides can turn litmus solution red are:
  • A
    Lithium and sodium.
  • B
    Copper and potassium.
  • C
    Carbon and hydrogen.
  • ✓
    Phosphorus and sulphur.
Answer
Correct option: D.
Phosphorus and sulphur.
Phosphorus and sulphur are non$-$metals whose oxides are acidic in nature. These oxides turn blue litmus solution to red.
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MCQ 261 Mark
Which of the following has a triple bond as well as single bonds?
  • A
    Ethene.
  • B
    Methane.
  • ✓
    Ethyne.
  • D
    Nitrogen.
Answer
Correct option: C.
Ethyne.
An ethyne molecule $(H - C ≡ C - H)$ contains a triple bond between two carbon atoms and two single bonds between carbon and hydrogen atoms.
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MCQ 271 Mark
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
  • A
    An acidic oxide.
  • B
    A basic oxide.
  • ✓
    An amphoteric oxide.
  • D
    A neutral oxide.
Answer
Correct option: C.
An amphoteric oxide.
Zinc oxide can react with both acids and bases to form salt and water.
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MCQ 281 Mark
A sulphide ore is converted into metal oxide by the process of:
  • A
    Carbonation.
  • ✓
    Roasting.
  • C
    Calcination.
  • D
    Anodising.
Answer
Correct option: B.
Roasting.
Sulphide ores are transformed into oxides by the process of roasting. In this process, concentrated ore is heated in the presence of surplus air. Example: Zinc blende, $\ce{ZnS},$ a sulphide ore of zinc, is roasted in the presence of air. On roasting​, zinc sulphide gets transformed into zinc oxide.
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MCQ 291 Mark
The major ore of aluminium is known as:
  • A
    Cinnabar.
  • B
    Calamine.
  • ✓
    Bauxite.
  • D
    Pyrolusite.
Answer
Correct option: C.
Bauxite.
Bauxite is one of the major ores of aluminium. Its compound is aluminium oxide $\ce{(Al_2O_3.2H_2O)}$.
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MCQ 301 Mark
Which one of the following property is generally not exhibited by ionic compounds?
  • A
    Solubility in water.
  • ✓
    Electrical conductivity in solid state.
  • C
    High melting and boiling points.
  • D
    Electrical conductivity in molten state.
Answer
Correct option: B.
Electrical conductivity in solid state.
Because ionic compounds conduct electricity only in molten state or when dissolved in water to form aqueous solution.
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MCQ 311 Mark
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
  • A
    $Zn$
  • ✓
    $Ag$
  • C
    $Cu$
  • D
    $Mg$
Answer
Correct option: B.
$Ag$
$Ag$ will be replaced from the solution of its salt by the other three metals.
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MCQ 321 Mark
The metal which is always present in an amalgam is:
  • A
    Iron.
  • B
    Aluminium.
  • ✓
    Mercury.
  • D
    Magnesium.
Answer
Correct option: C.
Mercury.
An amalgam is an alloy of mercury with one or more metals. The combination of sodium with liquid mercury is called sodium amalgam. Amalgam of mercury with gold, silver or zinc is widely used for dental fillings.
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MCQ 331 Mark
An element $X$ forms two oxides $\ce{XO}$ and $\ce{XO_2}$. The oxide $\ce{XO}$ is neutral but $\ce{XO_2​​​​​​​}$​​​​​​​ is acidic in nature. The element $X$ is most likely to be:
  • A
    Sulphur.
  • ✓
    Carbon.
  • C
    Calcium.
  • D
    Hydrogen.
Answer
Correct option: B.
Carbon.
Carbon forms two oxides, $\ce{CO}$ and $\ce{CO_2}$. The oxide $\ce{CO}$ is neutral and $\ce{CO_2​​​​​​​}$​​​​​​​ is acidic in nature.
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MCQ 341 Mark
The metals which can produce amphoteric oxides are:
  • A
    Sodium and aluminium.
  • B
    Zinc and potassium.
  • C
    Calcium and sodium.
  • ✓
    Aluminium and zinc.
Answer
Correct option: D.
Aluminium and zinc.
Both aluminium and zinc oxides react with acids and bases to form salt and water.
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MCQ 351 Mark
Brass is an alloy of:
  • A
    $Cu$ and $Sn.$
  • B
    $Cu$ and $Pb.$
  • C
    $Pb$ and $Sn.$
  • ✓
    $Zn$ and $Cu.$
Answer
Correct option: D.
$Zn$ and $Cu.$
Brass is an alloy of copper and zinc. It comprises of $80$ percent copper and $20$ percent zinc.
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MCQ 361 Mark
Out of $\ce{KCl, HCl, CCl_4}$ and $\ce{NaCl}$, the compounds which are not ionic are:
  • A
    $\ce{KCl}$ and $\ce{HCl}$.
  • ✓
    $\ce{HCl}$ and $\ce{CCl_4}$.
  • C
    $\ce{CCl_4}$ and $\ce{NaCl}$.
  • D
    $\ce{KCl}$ and $\ce{CCl_4}$.
Answer
Correct option: B.
$\ce{HCl}$ and $\ce{CCl_4}$.
Both these compounds are formed by sharing of electrons and hence, they form covalent bonds and not ionic bonds.
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MCQ 371 Mark
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
  • A
    Chromium.
  • B
    Tin.
  • ✓
    Zinc.
  • D
    Copper.
Answer
Correct option: C.
Zinc.
Galvanisation is a process that involves dipping of iron objects into melted zinc. This gives a thin coating of zinc layer on the iron object that protects it from corrosion. Zinc, being a highly reactive metal, forms a thin layer of zinc oxide, which prevents iron from getting exposed to the atmospheric air.
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MCQ 381 Mark
The solution of one of the following compounds will not conduct electricity. This compounds is:
  • A
    $\ce{NaCl}$
  • ✓
    $\ce{CCl_4}$
  • C
    $\ce{MgCl_2}$
  • D
    $\ce{CaCl_2}$
Answer
Correct option: B.
$\ce{CCl_4}$
Because it is a covalent compound.
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MCQ 391 Mark
The metal which is always present in an amalgam is:
  • A
    Iron.
  • B
    Aluminium.
  • ✓
    Mercury.
  • D
    Magnesium.
Answer
Correct option: C.
Mercury.
An amalgam is an alloy of mercury with one or more metals. The combination of sodium with liquid mercury is called sodium amalgam. Amalgam of mercury with gold, silver or zinc is widely used for dental fillings.
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MCQ 401 Mark
The metal which can be extracted from pyrolusite ore is:
  • A
    Mercury.
  • ✓
    Manganese.
  • C
    Aluminium.
  • D
    Magnesium.
Answer
Correct option: B.
Manganese.
Manganese is extracted from its oxide ore, pyrolusite. The name of the compound in the ore is manganese dioxide having chemical formula $\ce{MnO_2}$.
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MCQ 411 Mark
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
  • A
    Magnesium and manganese.
  • B
    Iron and aluminium.
  • C
    Zinc and magnesium.
  • ✓
    Magnesium and aluminium.
Answer
Correct option: D.
Magnesium and aluminium.
This is because magnesium and aluminium are highly reactive metals and are placed high in the reactivity series. This is also due to the fact that their oxides are very stable and cannot be reduced easily.
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MCQ 421 Mark
Which of the following is an iron ore?
  • A
    Cinnabar.
  • B
    Calamine.
  • ✓
    Haematite.
  • D
    Rock salt.
Answer
Correct option: C.
Haematite.
Haematite is an iron ore and the compound is iron $(III)$ oxide $\ce{(Fe_2O_3)}$.
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MCQ 431 Mark
Which of the following metal exists in the liquid state?
  • A
    $Na$
  • B
    $Ag$
  • C
    $Cr$
  • ✓
    $Hg$
Answer
Correct option: D.
$Hg$
Mercury $(Hg)$ is the metal that exists in liquid state at room temperature.
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MCQ 441 Mark
A basic oxide will be formed by the element:
  • ✓
    $K$
  • B
    $S$
  • C
    $P$
  • D
    $Kr$
Answer
Correct option: A.
$K$
Because $K$ is a metal, its oxide $\ce{K_2O}$ is a basic oxide.
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MCQ 451 Mark
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
  • A
    $Mg$
  • B
    $S$
  • C
    $P$
  • ✓
    $Na$
Answer
Correct option: D.
$Na$
$Na$ is soft and can be cut with a knife. It is very reactive and cannot be kept in open air. It reacts vigorously with water.
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MCQ 461 Mark
Zinc blende ore can be converted into zinc oxide by the process of:
  • ✓
    Roasting.
  • B
    Hydrogenation.
  • C
    Chlorination.
  • D
    Calcination.
Answer
Correct option: A.
Roasting.
Roasting.
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MCQ 471 Mark
The atomic number of an element $X$ is $19$. The number of electrons in its ion $X^+$ will be:
  • ✓
    $18$
  • B
    $19$
  • C
    $20$
  • D
    $21$
Answer
Correct option: A.
$18$
Because $X^+$ ion contains one less electron than $X$.
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MCQ 481 Mark
Out of the following oxides, the amphoteric oxide is:
  • A
    $\ce{Fe_2O_3}$
  • ✓
    $\ce{Al_2O_3}$
  • C
    $\ce{P_2O_5}$
  • D
    $\ce{N_2O}$
Answer
Correct option: B.
$\ce{Al_2O_3}$
$\ce{Al_2O_3}$​​​​​​​ can react with acids as well as bases to form salt and water.
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MCQ 491 Mark
The electrons present in the valence shell of a noble gas atom can be:
  • A
    $8$ only.
  • B
    $2$ only.
  • ✓
    $8$ or $2.$
  • D
    $8$ or $4.$
Answer
Correct option: C.
$8$ or $2.$
Helium is the only noble gas that has $2$ electrons in its valence shell. Other noble gases have $8$ electrons in their valence shells.
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MCQ 501 Mark
The atomic numbers of four elements $P, Q, R$ and $S$ are $6, 10, 12$ and $17$ respectively. Which two elements can combine to form a covalent compound?
  • A
    $P$ and $R$
  • B
    $Q$ and $S$
  • ✓
    $P$ and $S$
  • D
    $R$ and $S$
Answer
Correct option: C.
$P$ and $S$
Element $P$ needs $4$ electrons to complete its octet. They can be shared with element $S,$ which needs only $1$ electron to complete its octet.
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