Exercise-2

Match Column-$\mathrm{I}$ with column-$\mathrm{II}$ and select the correct answer with respect to the name given below.

Code:

Which statement is/are incorrect?

An element having electronic configuration $1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^6 4{\mathrm{s}}^1$ will form _______.

A substance $\left(\mathrm{P}\right)$ releases a gas $\left(\mathrm{Q}\right)$ on reaction with ${\mathrm{H}}_2\mathrm{O}.\left(\mathrm{Q}\right)$ decolourises ${\mathrm{Br}}_2$ water. $\left(\mathrm{P}\right)$ may be:

Nitrate can be converted into metal oxide on heating not above $500°\mathrm{C}$ in case of:

A substance (P), when heated in a dry test tube, liberated a colourless odourless gas that rekindled a glowing splinter. It may be:

Sodium thiosulphate is used in photography because of its:

Alkali metal salt $"\mathrm{X}"$ gives a pale violet colour in flame test $"\mathrm{X}"$ is: