(X) KOH → (Y) (gas turns red litmus blue) + (Z) Zn + KOH → (Y) (gas) . (X) Δ → gas (does not support combustion) Identify (X) to (Z):

Correct answer: A. cases X = NH _ 4 NO _ 2 & Y = NH _ 3 & Z = KNO _ 2 cases NH _ 4 NO _ 2 _ X + KOH → NH _ 3 ↑ _ Y + KNO _ 2 _ Z + H _ 2 O NO _ 2 ^ - _ Z + 3 Zn + 5 OH ^ - + 5 H _ 2 O → 3 [Zn (OH) _ 4 ] ^ 2 - _ soluble + NH _ 3 ↑ _ Y cases NH _ 4 NO _ 2 & Δ → & N _ 2 ↑ & + & 2 H _ 2 O (X) & & (Does not support & & & & combustion) & & cases

JEE Main

Exam: JEE Main
Subject: Chemistry
Chapter: Practical Chemistry

JEE Main · Chemistry · Practical Chemistry

(X) KOH → (Y) (gas turns red litmus blue) + (Z) Zn + KOH → (Y)...

\left(\text{X}\right) \overset{KOH}{→} \left(\text{Y}\right) (gas turns red litmus blue) + \left(\text{Z}\right) \overset{\text{Zn} + \text{KOH}}{→} \left(\text{Y}\right) (gas) .

<br/> <br/> \left(\text{X}\right) \overset{Δ}{→} \text{gas} (does not support combustion)

Identify (X) to (Z):

Options

A $\begin{cases}\text{X} = {NH}_{4} {NO}_{2} & \text{Y} = {NH}_{3} & \text{Z} = {KNO}_{2}\end{cases}$
B $\begin{cases}\text{X} = {( \text{NH}}_{4} {)}_{2} {Cr}_{2} {O}_{7} & \text{Y} = {NH}_{3} & \text{Z} = {Cr}_{2} {O}_{3}\end{cases}$
C $\begin{cases}\text{X} = {( \text{NH}}_{4} {)}_{2} {SO}_{4} & \text{Y} = {NH}_{3} & \text{Z} = {K}_{2} {SO}_{4}\end{cases}$
D $\begin{cases}\text{X} = {NH}_{4} {NO}_{3} & \text{Y} = {NH}_{3} & \text{Z} = {KNO}_{3}\end{cases}$

Correct answer

A. $\begin{cases}\text{X} = {NH}_{4} {NO}_{2} & \text{Y} = {NH}_{3} & \text{Z} = {KNO}_{2}\end{cases}$

Step-by-step solution

\mathop{{NH}_{4} {NO}_{2}}_{\text{X}} + \text{KOH} \to \mathop{{NH}_{3} ↑}_{\text{Y}} + \mathop{{KNO}_{2}}_{\text{Z}} + {H}_{2} \text{O}

\mathop{{NO}_{2}^{-}}_{\text{Z}} + 3 \text{Zn} + 5 {OH}^{-} + 5 {H}_{2} \text{O} \to \mathop{3 {\left[\text{Zn} {\left(\text{OH}\right)}_{4}\right]}^{2 -}}_{soluble} + \mathop{{NH}_{3} ↑}_{\text{Y}}

\begin{cases}{NH}_{4} {NO}_{2} & \overset{Δ}{→} & {N}_{2} ↑ & + & 2 {H}_{2} \text{O} \\ \left(\text{X}\right) & & \text{(Does not support} & & \\ & & \text{combustion)} & & \end{cases}

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