JEE Main 20204 SeptemberMorning Shift

Exam: JEE Main
Year: 2020
Date: 4 September
Shift: Morning Shift
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2020 · 4 September · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)

On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on...

On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is:

Options

A $+ 5$
B $+ 2$
C $+ 3$
D $+ 4$

Correct answer

C. $+ 3$

Step-by-step solution

$Pb{\left({NO}_{3}\right)}_{2}\overset{\Delta}{\to}PbO + 2{NO}_{2}\left(A\right)$ (brown gas)

$\mathop{2{NO}_{2}}_{\left(A\right)}\left(g\right)\overset{cooling}{\to}\mathop{{N}_{2}{O}_{4}}_{\left(B\right)}$

$+ 3{NO}_{2}\left(g\right) + NO\left(g\right) \to \mathop{{N}_{2}{O}_{3}}_{'}\left(C\right)$

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