Download App

The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements1 Mark
Question
A gaseous substance dissolves in water giving a pale blue solution which decolourises $\mathrm{KMnO}_4$ and oxides KI to $\mathrm{I}_2$. Identify the gaseous substance.
✓

Answer

$\mathrm{N}_2 \mathrm{O}_3$ is gaseous substance.
$\mathrm{N}_2 \mathrm{O}_3+\mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{HNO}_2$ (pale blue solution)
It decolouries $\mathrm{KM}_{\mathrm{n}} \mathrm{O}_4$ oxidises $\mathrm{HNO}_2$ to $\mathrm{HNO}_3$ and gets reduced to $\mathrm{M}_{\mathrm{n}^{2+}}$ which is colourless.
$\mathrm{HNO}_2$ oxidises $\mathrm{KI}$ to $\mathrm{I}_2$ because $\mathrm{I}^{-}$is good reducing agent.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "1 Marks Question" from The p-Block Elements→The p-Block Elements — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

How will you separate a mixture of o-nitrophenol and p-nitrophenol?
→
$\text{E}^\circ_\frac{\text{Zn}^{2+}}{\text{Zn}}=-0.76\text{V}$
$\text{E}^\circ_\frac{\text{Cr}^{2+}}{\text{Cr}}=-0.74$
$\text{E}^\circ_\frac{\text{H}^+}{\text{H}_2}=0$
$\text{E}^\circ_\frac{\text{Fe}^{3+}}{\text{Fe}^{3+}}=0.77\text{V}$
Which is the strongest oxidising agent out of them?
→
Write the resonance structures for
$\mathrm{SO}_3$
→
Why alkanes are known as paraffins?
→
Ozone gas is heavier than air. Why does ozone layer not settle down near the earth?
→
Which one of the following is not extensive state function?
Enthalpy change, Internal energy change and Pressure.
→
A sample of hard water is allowed to pass through an anion exchanger. Will it produce lather will soap easily?
→
Complete the following equations:
$\text{CO(g)}+2\text{H}_2\text{(g)}\xrightarrow[\text{Catalyst}]{\text{Cobalt}}$
→
Chlorination of calcium hydroxide produces bleaching powder. Write its chemical equation.
→
Arrange $\mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Ca}^{2+}$ in the increasing order of their atomic size.
→