JEE Advanced 2017 · Paper 2 · Chemistry Q16

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ChemistrySingle correct+3Question 34 of 54

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Upon heating $\ce{KClO3}$ in the presence of catalytic amount of $\ce{MnO2}$ , a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure $\ce{HNO3}$ gives Y and Z.

Y and Z are, respectively

\ce{N2O3}

and

\ce{H3PO4}

\ce{N2O5}

and

\ce{HPO3}

\ce{N2O4}

and

\ce{HPO3}

\ce{N2O4}

and

\ce{H3PO3}

Answer and worked solution

Official answer: B

$\ce{P4O10}$ is a powerful dehydrating agent. It strips water from nitric acid:
$\ce{P4O10 + 4HNO3 -> 4HPO3 + 2N2O5}.$
So Y is $\ce{N2O5}$ and Z is $\ce{HPO3}$ .

(B)

Topics:Group 15 Oxoacids

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JEE Advanced 2017 · Paper 2, Chemistry question 16