Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 1: EXERCISE-1

An ideal gaseous mixture of ethane $\left({\mathrm{C}}_2{\mathrm{H}}_6\right)$ and ethene $\left({\mathrm{C}}_2{\mathrm{H}}_4\right)$ occupies $28$ litre at $1 \mathrm{atm}, 0°\mathrm{C}.$ The mixture reacts completely with $128 \mathrm{gm} {\mathrm{O}}_2$ to produce ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2\mathrm{O}.$ Mole fraction at ${\mathrm{C}}_2{\mathrm{H}}_6$ in the mixture is-

If molecules of the gas are spherical of radius $1 \stackrel{\mathrm{o}}{\mathrm{A}}$, the volume occupied by the molecules in $1$ mol of a gas is :

In the reaction ${\mathrm{CrO}}_5+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$; $2$ moles of ${\mathrm{CrO}}_5$ will liberate how many moles of ${\mathrm{O}}_2:-$

Temporary hardness is due to ${\mathrm{HCO}}_3^{-}$ of ${\mathrm{Mg}}^{2+}$ and ${\mathrm{Ca}}^{2+}.$ It is removed by addition of $\mathrm{CaO}.$

$\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2+\mathrm{CaO}\to 2{\mathrm{CaCO}}_3+{\mathrm{H}}_2\mathrm{O}$

Mass of $\mathrm{CaO}$ required to precipitate $2 \mathrm{g} {\mathrm{CaCO}}_3$is :-

$2 \mathrm{gm}$ of an impure mixture of ${\mathrm{MgCO}}_3$ was dissolved in $50 \mathrm{ml}$ of $0.8\mathrm{M} \mathrm{HCl}$ The excess of acid required $20 \mathrm{ml}$ of $0.2\mathrm{M} \mathrm{NaOH}$ for complete neutralization. The percentage of ${\mathrm{MgCO}}_3$ in the sample will be

The number of moles present in $2$ litre of $0.5 \mathrm{moles} \mathrm{NaOH}$ is:

The density of ${\mathrm{NH}}_4\mathrm{OH}$ solution is $0.6 \mathrm{g} {\mathrm{mL}}^{-1}$. It contains $34\%$ by weight of ${\mathrm{NH}}_4\mathrm{OH}$. Calculate the normality of the solution:

Out of molarity $\left(\mathrm{M}\right)$, molality $\left(\mathrm{m}\right)$, formality $\left(\mathrm{F}\right)$ and mole fraction $\left(\mathrm{x}\right)$ those independent of temperature are: