0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of N₂ evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is _________. [nearest integer]

(Given : Molar mass of N₂ is 28 g mol^$-$1. Molar volume of N₂ at STP : 22.4 L)

In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________

The sum of oxidation state of the metals in $\mathrm{Fe}(\mathrm{CO})_{5}, \mathrm{VO}^{2+}$ and is ___________.

Sum of oxidation states of bromine in bromic acid and perbromic acid is ___________.

0.01 M KMnO₄ solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of KMnO₄ solution left in the burette after the end point is _____________ mL. (nearest integer)

See the following chemical reaction:

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mathrm{~F}_{e}^{3+}+\mathrm{Z} \mathrm{H}_{2} \mathrm{O}$

$2 \mathrm{MnO}_4^{-}+\mathrm{bI}^{-}+\mathrm{cH}_2 \mathrm{O} \rightarrow x \mathrm{I}_2+y \mathrm{MnO}_2+z \overline{\mathrm{O}} \mathrm{H}$

Number of moles of $\mathrm{H}^{+}$ ions required by $1 \mathrm{~mole}$ of to oxidise oxalate ion to is _________.

$0.400 \mathrm{~g}$ of an organic compound $(\mathrm{X})$ gave $0.376 \mathrm{~g}$ of in Carius method for estimation of bromine. of bromine in the compound is ___________.

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

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 M H₂SO₄ solution. The percentage of nitrogen in the 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 $\mathrm{N_A=6.02\times10^{23}}$)

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)