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Chemistry MCQs for NEET — Practice Questions with Answers

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Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is –

PbO, $F e_{3} O_{4}$

CaO, $K_{2} O$

$C u_{2} O, S n O_{2}$

$F e_{2} O_{3}, Z n O$

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Explanation

(B). Alkali and alkaline earth metals are strong reducing agents. Hence they can not be prepared by the reduction of their oxides.

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Which of the following statement is false regarding saline hydrides –

They conduct electricity in molten state

They dissolve in water and liberate $H_{2}$

They are used as reducing agents

They are covalent in nature

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Explanation

(D). They are not covalent, but ionic in nature.

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Which of the following is an amphoteric oxide-

CaO

SrO

BeO

MgO

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Explanation

(C). BeO, because it is least electropositive in its group. Therefore, instead of basic oxide, it forms amphoteric oxide.

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Which one of the following about compounds of lithium is false –

The hydroxide, carbonate, nitrate decomposed to give the oxide on heating

It is the most electronegative element of group IA

The hydrogen carbonate cannot be isolated as a stable solid

It forms a superoxide

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Explanation

(D). Lithium forms an oxide $L i_{2} O$ , but not the peroxide or super oxide, because strong polarising power of small sized $L i^{+}$ ion is strong enough to restrict the oxidation of an oxide ion $O^{2 -}$ to the peroxide ion, $O_{2}^{2 -}$ .

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Which one of the following is most stable in ether-

$B e C l_{2}$

$C a C l_{2}$

$S r C l_{2}$

None of these

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Explanation

(A). Due to smaller cation $B e C l_{2}$ is most covalent and is most stable in ether.

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Which of the following will have the largest value of $K_{s p}$

$B e S O_{4}$

$M g S O_{4}$

$C a S O_{4}$

$B a S O_{4}$

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Explanation

(A). Because it is most soluble in water and solubility decreases as

$B e S O_{4}$ > $M g S O_{4}$ > $C a S O_{4}$ > $B a S O_{4}$

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What are $α$ , $β$ and $γ$ in the following equation

$α K_{4} [F e {(C N)}_{6}] + β K_{2} C O_{3} + γ S \overset{h e a t}{\to}$ Products ?

the products are Fe, $C O_{2},$ KCNO and KSCN.

1, 2, 3

2, 1, 5

1, 1, 5

2, 2, 3

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Explanation

(C). $K_{4} [F e {(C N)}_{6}] + K_{2} C O_{3} + 5 S \to F e + C O_{2} + K C N O + 5 K C N S$

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The correct order of increasing ionic character is –

$B e C l_{2} < M g C l_{2} < C a C l_{2} < B a C l_{2}$

$B e C l_{2} < M g C l_{2} < B a C l_{2} < C a C l_{2}$

$B e C l_{2} < B a C l_{2} < M g C l < C a C l_{2}$

$B a C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$

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Explanation

(A). The ionic character of the halides increases on moving down the group.

$B e C l_{2} < M g C l_{2} < C a C l_{2} < B a C l_{2}$

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Sodium metal cannot be stored under-

Benzene

Kerosene

Alcohol

Toluene

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Explanation

(C). Na reacts with alcohol

$N a + C_{2} H_{5} O H \to C_{2} H_{5} O N a + \frac{1}{2} H_{2}$

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$B e F_{2}$ is soluble in water whereas fluorides of other alkaline earth metals are insoluble because of–

Ionisation nature of $B e F_{2}$

Covalent nature of $B e F_{2}$

Greater hydration energy of $B e^{2 +}$ ion as compared to its lattice energy

None of these

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Explanation

(C). An ionic compound is soluble in water if its hydration energy > lattice energy.

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