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.
what option is correct from the above pic...
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Answer 1

Answer:

Explanation:Dear student,

Assertion : Brown fumes are produced when lead nitrate is heated.

This is true.

When lead nitrate is heated strongly, NO2 and O2 are given out.

In this decomposition reaction, the colourless compound lead nitrate forms a yellow compound, lead monoxide, and brown fumes of nitrogen dioxide gas are evolved.

Reason: Nitrogen dioxide is produced as a by product due to the decomposition of lead nitrate.

This is true.

2 Pb(NO3)2 → 2 PbO  + 4 NO2 + O2

Both Assertion and Reason are correct and Reason explains the assertion.

Option A is correct.

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Answer 2

Brown fumes are produced when Lead Nitrate is heated. Nitrogen dioxide gas is produced as a byproduct due to the decomposition of Lead Nitrate. Therefore, both the assertion and reason are correct and the reason is the correct explanation of assertion. Thus, the correct option is (a).

Explanation:

• The reaction in which a compound undergoes decomposition on heating is called a decomposition reaction.
• When lead nitrate is heated, it gets decomposed into lead oxide, nitrogen dioxide and oxygen.
• Nitrogen oxide gas is brown in colour. Therefore, brown fumes are evolved during the reaction.
• The reaction can be given as:

        $\[2Pb{(N{O_3})_2}\xrightarrow{\Delta }2PbO + 4N{O_2} + {O_2}\]$