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Assertion : Lead is a metal with a high ...

Assertion : Lead is a metal with a high density . It readily dissolves in moderately concentrated nitric acid giving colourless fumes which turn red in contact with air .
Reason : Nitric oxide (NO) is a colourless oxide of nitrogen while `NO_(2)` is coloured oxide of nitrogen .

A

If both the assertion and reason are true statement and reason is correct explanation of the assertion .

B

If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .

C

If the assertion is true but the reason is a false statement.

D

If both assertion and reason are false statements.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that lead is a metal with a high density and that it dissolves in moderately concentrated nitric acid to produce colorless fumes that turn red upon contact with air. - This is true. Lead (Pb) is indeed a dense metal, and when it reacts with nitric acid, it produces nitrogen oxides. 2. **Chemical Reaction**: - When lead reacts with nitric acid, the reaction can be represented as: \[ \text{Pb} + 4 \text{HNO}_3 \rightarrow \text{Pb(NO}_3\text{)}_2 + 2 \text{NO} + 2 \text{H}_2\text{O} \] - Here, nitrogen monoxide (NO) is produced, which is a colorless gas. 3. **Behavior of Gases**: - The colorless fumes (NO) produced will react with oxygen in the air to form nitrogen dioxide (NO₂), which is a reddish-brown gas: \[ 2 \text{NO} + \text{O}_2 \rightarrow 2 \text{NO}_2 \] - This explains why the fumes turn red when they come into contact with air. 4. **Understanding the Reason**: - The reason states that nitric oxide (NO) is a colorless oxide of nitrogen, while nitrogen dioxide (NO₂) is a colored oxide of nitrogen. - This is also true. NO is indeed colorless, while NO₂ is reddish-brown due to its paramagnetic nature. 5. **Conclusion**: - Both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason correctly explains the assertion. ### Final Answer: Both the assertion and the reason are correct, and the reason explains the assertion.
To solve the given question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that lead is a metal with a high density and that it dissolves in moderately concentrated nitric acid to produce colorless fumes that turn red upon contact with air. - This is true. Lead (Pb) is indeed a dense metal, and when it reacts with nitric acid, it produces nitrogen oxides. ...
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