In chloro-alkali industries,during the Solvay ammonia process,a redox change occurs during:

Which one of the following reactions does not take place?

The colour of an iodine solution is discharged by shaking it with an aqueous solution of:

Which of the following combinations of reagents does not undergo a redox reaction in an aqueous medium?

When $10 \, mL$ of an aqueous solution of $KMnO_{4}$ was titrated in acidic medium,an equal volume of $0.1 \, M$ aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of $KMnO_{4}$ in grams per litre is $...... \times 10^{-2}$. (Nearest integer)
[Atomic mass of $K=39, Mn=55, O=16$]

Assign $A, B, C, D$ from the given type of reaction.
$2KI + HgI_2 \downarrow \longrightarrow K_2[HgI_4]$