$\mathrm{KMnO}_{4}$ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$. Number of water molecules produced for 2 molecules of is ___________.

The pressure of a moist gas at $27^{\circ} \mathrm{C}$ is $4 \mathrm{~atm}$. The volume of the container is doubled at the same temperature. The new pressure of the moist gas is ________________ . (Nearest integer)

At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is __________ mm Hg. (Nearest integer)

The solubility product of $\mathrm{BaSO}_{4}$ is $1 \times 10^{-10}$ at . The solubility of in solution is ___________ (nearest integer).

At $600 \mathrm{~K}$, the root mean square (rms) speed of gas $\mathrm{X}$ (molar mass $=40$ ) is equal to the most probable speed of gas at . The molar mass of the gas is ___________ . (Nearest integer)

A $300 \mathrm{~mL}$ bottle of soft drink has $0.2 ~\mathrm{M}~ \mathrm{CO}_{2}$ dissolved in it. Assuming behaves as an ideal gas, the volume of the dissolved at is ____________ . (Nearest integer)

The total pressure of a mixture of non-reacting gases $\mathrm{X}(0.6 \mathrm{~g})$ and $\mathrm{Y}(0.45 \mathrm{~g})$ in a vessel is of .

'x' g of molecular oxygen $\left(\mathrm{O}_{2}\right)$ is mixed with $200 \mathrm{~g}$ of neon (Ne). The total pressure of the non-reactive mixture of and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of 'x' is _________.

The hydrogen electrode is dipped in a solution of $\mathrm{pH}=3$ at $25^{\circ} \mathrm{C}$. The potential of the electrode will be _________ .

$\text{FeO}_4^{2-} \xrightarrow{+2.2\text{V}} \text{Fe}^{3+} \xrightarrow{+0.70\text{V}} \text{Fe}^{2+} \xrightarrow{-0.45\text{V}} \text{Fe}^0$