Question

Assertion : Brown fumes are produced when lead nitrate is heated. Reason : Nitrogen dioxide gas is produced as a byproduct due to the decomposition of lead nitrate.
1 point
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect
(d) If Assertion and Reason both are incorrect
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Answer 1

Required Answer:-

Assertion :

• Brown fumes are produced when lead nitrate is heated.

- The assertion is true because when lead nitrate is decomposed by heating, we get lead oxide (yellow), nitrogen dioxide (brown fumes) and oxygen gas.

${ \boxed{ \rm{2Pb(NO_3)_2 \longrightarrow 2PbO + 4NO_2 + O_2}}}$

Reason :

• Nitrogen dioxide gas is produced as a byproduct due to the decomposition of lead nitrate.

- The reason is also true because nitrogen dioxide gas is released as represented above in the reaction. They are brown in colour and are released as fumes.

Hence:-

Assertion and Reason both are true and Reason is the correct explanation of Assertion because it is describing about why brown fumes are produced.

$\therefore$ Option A is the correct option.

Answer 2

Required Answer:-

Assertion :

• Brown fumes are produced when lead nitrate is heated.

⟶ The given assertion is true because when lead nitrate is heated then it forms lead oxide and nitrogen dioxide and oxygen gas.

Reaction:

$\red{\underline{\boxed{\sf 2Pb(NO_3)_2 \longrightarrow 2PbO + 4NO_2 + O_2}}}$

Reason:

• Nitrogen dioxide gas is produced as a byproduct due to the decomposition of lead nitrate.

⟶ The reason is also true because in the above reaction, the nitrogen gas is released. It releases as fumes and is brown in colour.

Therefore:-

Assertion and Reason both are true and Reason is the correct explanation of Assertion.

• Option (A) is the correct answer.