Embibe Experts Solutions for Chapter: Mole Concept - 2, Exercise 1: EXERCISE

Determine the oxidation number of iron in ${\mathrm{Na}}_2\left[\mathrm{Fe}(\mathrm{CN}{)}_5\left({\mathrm{NO}}^{+}\right)\right]$.

What volume (in litres) of hydrogen gas at $273 \mathrm{K}$ and $1 \mathrm{atm}$ pressure, will be consumed in obtaining $21.6 \mathrm{g}$ of elemental boron (atomic mass $=10.8$), from the reduction of boron trichloride by hydrogen? ($0.672/ 6.72/ 67.2$)

A mixture of $0.02$ mole of ${\mathrm{KBrO}}_3$ and $0.01$ mole of $\mathrm{KBr}$ was treated with excess of $\mathrm{KI}$ and acidified. Determine the volume of $0.1 \mathrm{M} {\mathrm{Na}}_2 {\mathrm{S}}_2{\mathrm{O}}_3$ solution required to consume the liberated iodine.

Determine the oxidation state of $\mathrm{Cr}$ in ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]}^{+}$:

Determine the oxidation state of chromium in the final product formed by the reaction between $\mathrm{KI}$ and acidified potassium dichromate solution.

$35 \mathrm{mL}$ sample of hydrogen peroxide gives off $500 \mathrm{mL}$ of ${\mathrm{O}}_2$ at ${27}^{\circ }\mathrm{C}$ and $1$ $\mathrm{atm}$ pressure. Determine volume strength of ${\mathrm{H}}_2{\mathrm{O}}_2$ sample.

$29.5 \mathrm{mg}$ of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in $20 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{HCl}$ solution. The excess of the acid required $15 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$ solution for complete neutralization. Determine the percentage of nitrogen in the compound.

A metal oxide has the formula ${\mathrm{Z}}_2{\mathrm{O}}_3$. It can be reduced by hydrogen to give free metal and water. $0.32 \mathrm{g}$ of the metal oxide requires $12 \mathrm{mg}$ of hydrogen for complete reduction. Determine the atomic weight of the metal.