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Chemistry NEET Questions — Free MCQ Practice

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Which of the following acts as an oxidizing as well as a reducing agent?

A.

${Na}_{2} O$

B.

${NaO}_{3}$

C.

$NaNO$

D.

${NaNO}_{2}$

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Explanation

(D)

${NaNO}_{2}$ (sodium nitrite) acts both as an oxidizing agent and reducing agent because the nitrogen

atom in it is in +3 oxidation state (+3 intermediate oxidation state for nitrogen)

Oxidizing property : $2 {NaNO}_{2} + 2 Kl + 2 H_{2} {SO}_{4} \overset{}{\to} {NaSO}_{4} + K_{2} {SO}_{4} + 2 NO + 2 H_{2} O + l_{2}$

Reducing property : ${NaNO}_{2} + H_{2} O_{2} \overset{}{\to} {NaNO}_{3} + H_{2} O .$

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Alkaline earth metal nitrates on heating decompose to give:

A.

$M {({NO}_{2})}_{2} and O_{2} only$

B.

$MO, N_{2} and O_{2}$

C.

$MO, {NO}_{2} and O_{2}$

D.

$MO and {NO}_{2} only$

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Explanation

(C) $2 M {({NO}_{3})}_{2} \overset{∆}{\to} 2 MO + 4 {NO}_{2} + O_{2} (M = Be, Mg, Ca, Sr, Ba)$

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Consider the following statements and pick out the correct one.

A.

The solubility, thermal stability, and the basic character of the hydroxides of alkaline earth

metals increases from $Mg {(OH)}_{2} to Ba {(OH)}_{2} .$

B.

The dehydration of hydrated chlorides, bromides, bromides and iodides of Ca, Sr and Ba can be

achieved on heating.

C.

The chlorides of both beryllium and aluminium are soluble in organic solvents and are strong

Lewis acids.

(A) (1) and (2) only

(B) (1) and (3) only

(C) (1), (2) and (3)

D.

none

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Explanation

(C)

(1) The solubility increases down the group because the change in lattice energy is more as compared

to hydration energy. Thermal stability and the basic character both increase down the group as

metallic character increases.

(2) It is a correct statement.

(3) Beryllium and aluminium are diagonally related. Chlorides of both are covalent in nature and

thus are soluble in organic solvents. Chlorides of both are electron deficient and thus act as

strong Lewis acids.

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Assertion : The lithium ion itself, and also its compounds, are more heavily hydrated
than those of the rest of the group members.

Reason : The $L i^{+}$ is smallest among alkali metals and polarizes water molecules more easily than the other alkali metal ions.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

Assertion and reason are correct statements and reason is the correct explanation of assertion.

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Assertion : Beryllium resembles aluminium.

Reason : : Charge / radius of $B e^{2 +}$ ion is nearly the same as that of the $A l^{3 +}$ ion.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) Beryllium and aluminium have diagonal relationship.

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Assertion : Alkali metals dissolve in liquid ammonia and produce solvated cations and
solvated electrons

Reason : In concentrated solutions, the blue colour of the solutions of alkali metals in liquid ammonia, changes to bronze colour.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) $M + (x + y) N H_{3} \to {[M {(N H_{3})}_{x}]}^{+} + {[e {(N H_{3})}_{y}]}^{-}$

Above 3M concentration, the solutions are no longer blue but are bronze/copper-bronze
coloured with a metallic luster due to formation of metal ion clusters.

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Assertion : As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases.

Reason : Lithium carbonates is not so stable to heat ; lithium being very small in size polarizes a large $C O_{3}^{2 -}$ ion leading to the formation of more stable $L i_{2} O$ and $C O_{2}$ .

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) (i) Bigger cation stabilises bigger anions and vice-versa.

(ii) Alkali metal carbonates and their bicarbonates stabilities depend on their metallic character.
Stability of carbonates and bicarbonates $\propto$ Metallic character of their i.e. electropositive character.

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In the reaction $M + O_{2} \to M O_{2}$ (super oxide) the metal is -

A.

Li

B.

Na

C.

K

D.

Ba

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Explanation

(C) Among alkali metals super oxides are formed only by K, Rb and Cs.

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The reaction of sodium with water is highly exothermic. The rate of reaction can be lowered by-

A.

Decreasing the temperature

B.

Mixing with alcohol

C.

Mixing with acetic acid

D.

Making an amalgam

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Explanation

(D) Sodium amalgam is less reactive than sodium metal.

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Pearl ash and caustic potash are chemically-

A.

$K_{2} C O_{3}$ and KOH

B.

KOH and $K_{2} C O_{3}$

C.

$N a_{2} C O_{3}$ and KOH

D.

$N a_{2} C O_{3}$ and NaOH

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Explanation

(A) Pearl ash is $K_{2} C O_{3}$ ; caustic potash is KOH.

Chemistry MCQs for NEET — Practice Questions with Answers

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