Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 4: EXERCISE-III (Analytical Questions)

Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer (Atomic masses:$\mathrm{O}=16, \mathrm{Cu}=63$ and $\mathrm{N}=14)$
$\mathrm{I}. 1$ molecule of oxygen.
$\mathrm{II}. 1$ atom of nitrogen.
$\mathrm{III}.$ $1\times {10}^{-10} \mathrm{g}$ molecular weight of oxygen.
$\mathrm{IV}.$ $1\times {10}^{-10} \mathrm{g}$ atomic weight of copper.

How many moles of magnesium phosphate, $\mathrm{Mg}{\left({\mathrm{PO}}_4\right)}_2$ will contain $0.25$mole of oxygen atoms? 

$1\mathrm{L}$ of a hydrocarbon weighs as much as $1\mathrm{L}$ of ${\mathrm{CO}}_2$ under similar conditions. Then the molecular formula of the hydrocarbon is:

There are two oxides of sulphur. They contain $50\%$ and $60\%$ of oxygen respectively by weight. The weight of sulphur which combines with $1 \mathrm{g}$ of oxygen is in the ratio of:

A litre of air containing $1\% \mathrm{Ar}$ is repeatedly passed over hot $\mathrm{Cu}$ and hot $\mathrm{Mg}$ till no reduction of volume takes place. The final volume of $\mathrm{Ar}$ shall be:

$10\mathrm{mL}$ concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4\left(18\mathrm{molar}\right)$ is diluted to $1$ litre. Concentration of diluted acid is:-

The molality of a urea solution in which $0.0100 \mathrm{g}$ of urea, $\left[{\left({\mathrm{NH}}_2\right)}_2\mathrm{CO}\right]$ is added to $0.3000 {\mathrm{dm}}^3$ of water at $\mathrm{STP}$ is: