Embibe Experts Solutions for Chapter: Mole Concept - 1, Exercise 2: KVPY PROBLEMS (PREVIOUS YEARS)

If Avogadro's number is ${\mathrm{A}}_0,$ the number of sulphur atoms present in $200 \mathrm{mL}$ of $1 \mathrm{N} {\mathrm{H}}_2{\mathrm{SO}}_4$ is:

When $22.4 \mathrm{L}$ of ${\mathrm{C}}_4{\mathrm{H}}_8$ at $\mathrm{STP}$ is burnt completely, $89.6 \mathrm{L}$ of ${\mathrm{CO}}_2$ gas at $\mathrm{STP}$ and $72 \mathrm{g}$ of water are produced. The volume of the oxygen gas at $\mathrm{STP}$ consumed in the reaction is the closest to:

One mole of the sodium salts listed below, having carbon content close to$14.3\%$, produces $1$ mole of carbon dioxide upon heating $($Atomic mass$\mathrm{Na}=23, \mathrm{H}=1, \mathrm{C}=12, \mathrm{O}=16)$. The salt is:
 

$\mathrm{LiOH}$ reacts with ${\mathrm{CO}}_2$ to form ${\mathrm{Li}}_2{\mathrm{CO}}_3$ $($Atomic mass of$\mathrm{Li}=7)$. The amount of ${\mathrm{CO}}_2$ (in $\mathrm{g}$) consumed by $1 \mathrm{g}$ of $\mathrm{LiOH}$ is the closest to

The oxidation number of sulphur is $+4$ in

A redox reaction among the following is:

(i) ${\mathrm{CdCl}}_2+2\mathrm{KOH}\to \mathrm{Cd}(\mathrm{OH}{)}_2+2\mathrm{KCl}$

(ii) ${\mathrm{BaCl}}_{2 }+{\mathrm{K}}_2{\mathrm{SO}}_4\to {\mathrm{BaSO}}_4+2\mathrm{KCI}$

(iii) ${\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2$

(iv) $2\mathrm{Ca}+{\mathrm{O}}_2\to 2\mathrm{CaO}$

The amount (in $\mathrm{mol}$) of bromoform $\left({\mathrm{CHBr}}_3\right)$produced when $1.0 \mathrm{mol}$ of acetone reacts completely with $1.0 \mathrm{mol}$ of bromine in the presence of aqueous $\mathrm{NaOH}$ is:

The number of water molecules in $250 \mathrm{mL}$ of water is closest to [Given: Density of water is$1.0 \mathrm{g} {\mathrm{mL}}^{-1};$ Avogadro's number $=6.023\times {10}^{23}$]