A sample of $0.125 \mathrm{~g}$ of an organic compound when analyzed by Duma's method yields $22.78 \mathrm{~mL}$ of nitrogen gas collected over $\mathrm{KOH}$ solution at and . The percentage of nitrogen in the given organic compound is __________. (Nearest integer)

A metal M forms hexagonal close-packed structure. The total number of voids in 0.02 mol of it is _________ $\times$ $10^{21}$ (Nearest integer).

(Given $\mathrm{N_A=6.02\times10^{23}}$)

$20 \mathrm{~mL}$ of $0.02\, \mathrm{M}$ hypo solution is used for the titration of $10 \mathrm{~mL}$ of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of is found to be ____________ . [nearest integer]

The normality of $\mathrm{H}_{2} \mathrm{SO}_{4}$ in the solution obtained on mixing of with of is _______________ . (Nearest Integer)

20 mL of $0.1 ~\mathrm{M} ~\mathrm{NaOH}$ is added to $50 \mathrm{~mL}$ of $0.1 ~\mathrm{M}$ acetic acid solution. The of the resulting solution is ___________ (Nearest integer)

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

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)

2.0 g of H₂ gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram of the adsorbent is __________ mL.

(Given : R = 0.083 L bar K^$-$1 mol^$-$1)

$25.0 \mathrm{~mL}$ of $0.050 ~\mathrm{M} ~\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}$ is mixed with of of is at . The ratio of and is ___________.

Consider the dissociation of the weak acid HX as given below

$\mathrm{HX}(\mathrm{aq}) \rightleftharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{X}^{-}(\mathrm{aq}), \mathrm{Ka}=1.2 \times 10^{-5}$

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 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 _________.