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Standard XII

Chemistry

Limiting Reagent or Reactant

Assertion :Co...

Question

Assertion :Conc. $H_{2} S O_{4}$ cannot be used to prepare pure $H B r$ from $N a B r$ . Reason: It reacts slowly with $N a B r$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Conc. $H_{2} S O_{4}$ cannot be used to prepare pure HBr from NaBr because NaBr and $H_{2} S O_{4}$ produces nearly all $B r_{2}$ , relatively little HBr.

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :Conc.H2SO4 cannot be used to prepare pure HBr from NaBr. Reason: It reacts slowly with NaBr.

The correct option is C Assertion is correct but Reason is incorrectConc. H2SO4 cannot be used to prepare pure HBr from NaBr because NaBr and H2SO4 produces nearly all Br2, relatively little HBr.

Assertion :Conc. $H_{2} S O_{4}$ cannot be used to prepare pure $H B r$ from $N a B r$ . Reason: It reacts slowly with $N a B r$ .

The correct option is C Assertion is correct but Reason is incorrect
Conc. $H_{2} S O_{4}$ cannot be used to prepare pure HBr from NaBr because NaBr and $H_{2} S O_{4}$ produces nearly all $B r_{2}$ , relatively little HBr.