MCQ 11 Mark
Assertion: Rusting of Iron is endothermic in nature.
Reason: As the reaction is slow, the release of heat is barely evident.
- A
Both A and R are true, and R is the correct explanation of A.
- B
Both A and R are true, and R is not the correct explanation of A
- C
A is true but R is false.
- ✓
A is false but R is true.
AnswerCorrect option: D. A is false but R is true.
(D) A is false but R is true.
View full question & answer→MCQ 21 Mark
On adding dilute sulphuric acid to a test tube containing a metal ' $X$ ', a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal ' $X$ '?
View full question & answer→MCQ 31 Mark
Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked $\ce{I, II}$ and $\ce{III}$ respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observed in
- A
$\ce{I}$ and $\ce{II}$
- B
$\ce{II}$ and $\ce{III}$
- C
$\ce{III}$ and $\ce{I}$
- ✓
AnswerAluminium is highly reactive as compared to Copper, Iron and Zinc.
Therefore Aluminium will displace all the metals from its salt. Thus aluminum will appear in all the three solution.
View full question & answer→MCQ 41 Mark
The aqueous solutions of copper sulphate and zinc sulphate appear:
- A
Blue and green respectively.
- B
Green and colourless respectively.
- C
Blue and brown respectively.
- ✓
Blue and colourless respectively.
AnswerCorrect option: D. Blue and colourless respectively.
The solution of Copper sulphate is Blue in color and that of Zinc sulphate is colorless because zinc is more reactive than copper and displaces copper from copper sulphate solution.
View full question & answer→MCQ 51 Mark
Acetic acid reacts with solid sodium hydrogen carbonate :
- A
- ✓
Vigorously with effervescence.
- C
Slowly without effervescence.
- D
Vigorously without gas formation.
AnswerCorrect option: B. Vigorously with effervescence.
When acetic acid reacts with sodium hydrogen carbonates then brisk effervescence are observed.
These effervescence are evolved due to the release of carbon dioxide from sodium hydrogen carbonate.
View full question & answer→MCQ 61 Mark
A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after $15$ minutes, its surface was found to be coated with a silvery grey deposit. From the above observation it can be concluded that
- ✓
Aluminium is more reactive than zinc.
- B
Zinc is more reactive than aluminium.
- C
Zinc and aluminium both are equally reactive.
- D
Zinc and aluminium both are non-reactive.
AnswerCorrect option: A. Aluminium is more reactive than zinc.
View full question & answer→MCQ 71 Mark
A student prepared an aqueous solution of $\text{CuSO}_4$ in beaker $X$ and an aqueous solution of $\text{FeSO}_4$ in beaker $Y$. He then dropped some iron pieces m beaker $X$ and some zinc pieces in beaker $Y$. After about $10$ hours he observed that the solutions in $X$ and $Y$ respectively appear:
- A
- B
Colourless and pale green.
- C
Colourless and light blue.
- ✓
View full question & answer→MCQ 81 Mark
The colours of aqueous solution of $\text{CuSO}_{4}$ and $\text{FeSO}_{4}$ as observed in the laboratory are:
- A
Pale green and light blue respectively.
- B
Light blue and dark green respectively.
- C
Dark blue and dark green respectively.
- ✓
Dark blue and pale green respectively.
AnswerCorrect option: D. Dark blue and pale green respectively.
View full question & answer→MCQ 91 Mark
To show that zinc is a more active metal than copper, the correct procedure is to :
- A
Add dilute nitric acid on strips of both the metals.
- B
Observe transmission of heat through strips of zinc and copper.
- C
Prepare solution of zinc sulphate and hang strip of copper into it.
- ✓
Prepare e solution of copper sulphate and hang strip of zinc into it.
AnswerCorrect option: D. Prepare e solution of copper sulphate and hang strip of zinc into it.
View full question & answer→MCQ 101 Mark
An element $'X\ '$ reacts with $\mathrm{O}_2$ to give a compound with a high melting point. This compound is also soluble in water. The element $'X\ '$ is likely to be :
AnswerCalcium Oxide is formed when Calcium reacts with Oxygen.
But In certain cases, Silicon Dioxide may also be possible $($Because its solubility depends on its crystalline structure$).$
View full question & answer→MCQ 111 Mark
Beakers $A, B$ and $C$ contain zinc sulphate, silver nitrate and iron $\ce{(II)}$ sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of:
- A
Beaker $A$
- ✓
Beaker $B$
- C
Beaker $C$
- D
AnswerCorrect option: B. Beaker $B$
View full question & answer→MCQ 121 Mark
The atomic numbers of four elements $\ce{A, B, C}$ and $D$ 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 $D$
AnswerCorrect 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.
View full question & answer→MCQ 131 Mark
The conduction of electricity through a solution involves the movement of $............ $ particles.
AnswerThe aqueous solution of ionic compounds contains charged particles and these particles or ions help in the conduction of electricity.
View full question & answer→MCQ 141 Mark
Stainless steel is very useful material for our life. In stainless steel, iron is mixed with :
- ✓
$\ce{Ni}$ and $\ce{Cr.}$
- B
$\ce{Cu}$ and $\ce{Cr}.$
- C
$\ce{Ni}$ and $\ce{Cu}.$
- D
$\ce{Cu}$ and $\ce{Au}$.
AnswerCorrect option: A. $\ce{Ni}$ and $\ce{Cr.}$
Stainless steels are formed with the addition of high proportion of chromium and nickel to iron.
View full question & answer→MCQ 151 Mark
Which of the following pairs of substances, on reaction, will not evolve $\mathrm{H}_2$ gas?
AnswerCorrect option: C. Copper and $\ce{HCl(g)}$
As per the reactivity series, Copper falls below Hydrogen which means its reactivity is lower than that of hydrogen, so it cannot displace hydrogen from hydrochloric acid.
View full question & answer→MCQ 161 Mark
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
- $\ce{Na}$
- $\ce{Ca}$
- $\ce{Fe}$
- $\ce{Cu}$
- A
$1$ and $4$
- B
$3$ and $4$
- C
$1$ and $3$
- ✓
$1$ and $2$
AnswerCorrect option: D. $1$ and $2$
Usually alkali and alkaline earth metals can be extracted by electrolysis of their salts in molten state.
View full question & answer→MCQ 171 Mark
A basic lining is given to a furnace by using :
MCQ 181 Mark
An important ore of zinc metal is :
AnswerCalamine is an ore of zinc and the compound is zinc carbonate $(\mathrm{ZnCO}_3).$
View full question & answer→MCQ 191 Mark
The number of protons in one atom of an element $X$ is $8$ . What will be the number of electrons in its ion $X^{2-}\ ?$
AnswerNumber 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 $\mathrm{X}^{2-}=10+2=12$
View full question & answer→MCQ 201 Mark
During extraction of metals, electrolytic refining is used to obtain pure metals. Material which will be used as anode, for refining of silver metal by this process, is :
AnswerIn the electrolytic refining process, the impure metal is made the anode and a thin strip of pure metal is made the cathode.
Thus, for refining silver, impure silver would be used as the anode.
View full question & answer→MCQ 211 Mark
Heating pyrites to remove sulphur is called :
MCQ 221 Mark
A metal which reacts with cold water vigorously producing hydrogen is :
AnswerMetals like zinc, tungsten, and mercury do not readily react with cold water.
On the other hand, alkali metals are the most reactive metals in the periodic table so, when sodium is brought in contact with cold water, it reacts vigorously.
The reaction is violent and exothermic.
$2 \mathrm{Na}(\mathrm{s})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2(\mathrm{g})$
View full question & answer→MCQ 231 Mark
Which of the following non $-$ metal is a liquid?
AnswerBromine is the non $-$ metal that is a liquid.
View full question & answer→MCQ 241 Mark
Which of the following non $-$ metal is lustrous?
View full question & answer→MCQ 251 Mark
Which $3$ metals are magnetic?
- A
Nickle, Chromium and gold
- B
- C
- ✓
View full question & answer→MCQ 261 Mark
Zone refining is used for the :
MCQ 271 Mark
Non $-$ metals form covalent chlorides because :
- A
They can give electrons to chlorine.
- ✓
They can share electrons with chlorine.
- C
They can give electrons to chlorine atoms to form chloride ions.
- D
They cannot share electrons with chlorine atoms.
AnswerCorrect option: B. They can share electrons with chlorine.
View full question & answer→MCQ 281 Mark
The noble gas having only two electrons in its valence shell is :
- A
$\ce{Ar}$
- B
$\ce{Ne}$
- ✓
$\ce{He}$
- D
$\ce{Kr}$
AnswerCorrect option: C. $\ce{He}$
Atomic number of helium is $2$. It contains $2$ electrons in its atom.
View full question & answer→MCQ 291 Mark
During electrolytic refining of zinc, it gets:
- ✓
- B
- C
Deposited on cathode as well as anode.
- D
AnswerZinc is positively charged and hence is deposited at negatively charged cathode.
View full question & answer→MCQ 301 Mark
The only liquid metal at the room temperature :
MCQ 311 Mark
Which metal does not react with water?
- A
$\ce{Cu}$
- B
$\ce{Au}$
- ✓
Both $A$ and $B$
- D
$\ce{Fe}$
AnswerCorrect option: C. Both $A$ and $B$
Metals such as lead, copper, silver and gold do not react with water at all.
View full question & answer→MCQ 321 Mark
In stainless steel alloy, iron metal is mixed with:
- A
$Cu$ and $Cr$
- ✓
$Cr$ and $Ni$
- C
$Cr $ and $Sn$
- D
$Cu$ and $Ni$
AnswerCorrect 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.
View full question & answer→MCQ 331 Mark
Which of the following is an ore of mercury metal?
AnswerCinnabar is an important ore of mercury. Its compound is mercury $\ce{(II)}$ sulphide $\ce{(HgS)}.$
View full question & answer→MCQ 341 Mark
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals $($except $\ce{Mn}$ and $\ce{Mg})\ ?$
AnswerCorrect option: C. $\mathrm{HNO}_3$
$\mathrm{HNO}_3$ is a strong oxidising agent. It oxidises metals to metal oxides and then to metal nitrates and itself is reduced to either nitric oxide $(\mathrm{NO})$, nitruos oxide $\left(\mathrm{N}_2 \mathrm{O}\right)$ or nitrogen dioxide $\left(\mathrm{NO}_2\right)$.
However, both $\ce{Mg}$ and $\ce{Mn}$ evolve hydrogen on reacting with the acid.
View full question & answer→MCQ 351 Mark
$E$ is an element that's ore is rich in $\mathrm{E}_2 \mathrm{O}_3 \cdot \mathrm{E}_2 \mathrm{O}_3$ is not affected by water. It forms two chlorides, $\mathrm{ECl}_2$ and $\mathrm{ECl}_3$ The element $E$ is :
View full question & answer→MCQ 361 Mark
A mineral is known as ore if metal :
- A
Cannot be produced from it.
- B
- ✓
Can be extracted from it profitably.
- D
AnswerCorrect option: C. Can be extracted from it profitably.
View full question & answer→MCQ 371 Mark
Which of the following metals gives hydrogen with dil. $\mathrm{HNO}_3\ ?$
- ✓
$\ce{Mg}$
- B
$\ce{Zn}$
- C
$\ce{Al}$
- D
$\ce{Sn}$
AnswerCorrect option: A. $\ce{Mg}$
Magnesium $\ce{(Mg)}$ reacts with very dilute $\mathrm{HNO}_3$ to evolve $\mathrm{H}_2$ gas.
$\mathrm{Mg}+2 \mathrm{HNO}_3 \rightarrow \mathrm{Mg}\left(\mathrm{NO}_3\right)_2+\mathrm{H}_2$
View full question & answer→MCQ 381 Mark
Setting of Plaster of Paris takes place due to :
MCQ 391 Mark
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
- A
$\ce{Na}$
- B
$\ce{Fe}$
- C
$\ce{Cr}$
- ✓
$\ce{Hg}$
AnswerCorrect option: D. $\ce{Hg}$
Mercury $\ce{(Hg)}$ is a liquid at room temperature.
View full question & answer→MCQ 401 Mark
The common method for extraction of metals from the oxide ore is :
MCQ 411 Mark
Silver articles become black on prolonged exposure to air. This is due to the formation of :
- A
$\mathrm{Ag}_3 \mathrm{~N}$
- B
$\mathrm{Ag}_2 \mathrm{O}$
- ✓
$\mathrm{Ag}_2 \mathrm{~S}$
- D
$\mathrm{Ag}_2 \mathrm{~S} $ and $ \mathrm{Ag}_3 \mathrm{~N}$
AnswerCorrect option: C. $\mathrm{Ag}_2 \mathrm{~S}$
Air contains traces of hydrogen sulphide $\left(\mathrm{H}_2 \mathrm{~S}\right)$ gas which reacts with silver $(\mathrm{Ag})$ to form $\mathrm{Ag}_2 \mathrm{~S}$ black in colour.
View full question & answer→MCQ 421 Mark
Which of the following pairs will give displacement reactions?
- A
$\ce{NaCl}$ solution and copper metal.
- B
$\mathrm{MgCl}_2$ solution and aluminium metal.
- C
$\mathrm{FeSO}_4$ solution and silver metal.
- ✓
$\mathrm{AgNO}_3$ solution and copper metal.
AnswerCorrect option: D. $\mathrm{AgNO}_3$ solution and copper metal.
View full question & answer→MCQ 431 Mark
Which of the following property is generally not shown by metals?
AnswerMetals have shining lustre and they mostly do not show any dullness.
View full question & answer→MCQ 441 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
- ✓
- C
- D
Conduction of electricity in molten state.
AnswerCompound $Z$ is an ionic compound formed by transfer of electrons. Ionic compounds have high melting points.
View full question & answer→MCQ 451 Mark
The slag obtained during the extraction of copper pyrites is composed mainly of :
AnswerCorrect option: B. $\mathrm{FeSiO}_3$
View full question & answer→MCQ 461 Mark
The two metals which can be extracted just by heating their sulphides in air are :
AnswerBoth 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.
View full question & answer→MCQ 471 Mark
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
- $\ce{Au}$
- $\ce{Cu}$
- $\ce{Na}$
- $\ce{K}$
- ✓
$1$ and $2$
- B
$1$ and $3$
- C
$2$ and $3$
- D
$2$ and $4$
AnswerCorrect option: A. $1$ and $2$
Alkali metals are very reactive so cannot refine with the help of electrolytic refining process.
Electrolytic refining is used for metals like $\ce{Cu, Zn, Ag, Au}$ etc. The method to be used for refining an impure metal depends on the nature of the metals well as on the nature of impurities present in it. So, metals $\ce{Au}\ ($gold$)$ and $\ce{Cu}\ ($copper$)$ are refined by electrolytic refining.
View full question & answer→MCQ 481 Mark
An ore of manganese metal is :
AnswerPyrolusite is an ore of manganese and the compound is manganese dioxide $(\mathrm{MnO}_2).$
View full question & answer→MCQ 491 Mark
Reaction of metals with sulphuric acid produced :
- A
$\mathrm{SO}_2$ gas
- ✓
$\mathrm{H}_2$ gas
- C
$\mathrm{O}_2$ gas
- D
$\mathrm{SO}_3$ gas
AnswerCorrect option: B. $\mathrm{H}_2$ gas
Metals react with acids to give a salt and hydrogen gas.
Reaction : $2 \mathrm{M}+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{M}_2 \mathrm{SO}_4+\mathrm{H}_2$
View full question & answer→MCQ 501 Mark
The lustre of a metal is due to :
- A
- B
- C
- ✓
Presence of free electrons.
AnswerCorrect option: D. Presence of free electrons.
View full question & answer→