Question

Assertion :The amount of $CO$ in a gas sample can be determined by using the reaction:
$I_2{O}_5+5CO\to I_2+5C{O}_2.$
If gas sample liberates $127.0g$ of $I_2$, then $70g$ of $CO$ were present in the sample. Reason: $CO$ gas is absorbed in ammonical $CuCl$ solution.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

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

The reaction is as follows:
$I_2{O}_5+5CO\to I_2+5C{O}_2.$
Moles of $I_2=\frac{127}{254}=\frac{1}{2}$ mol.

1 mole of $I_2{O}_5$ requires 5 moles of CO.
Therefore, 0.5 moles of $I_2{O}_5$ requires $=\frac{5}{2}$.
Weight of $CO=\frac{5}{2}\times 28=70.0g$.
Both $\left(A\right)$ and $\left(R\right)$ are correct but $\left(R\right)$ is not the correct explanation of $\left(A\right)$.