Some Basic Concepts of Chemistry

Calculate molarity of $63 \% \mathrm{w} / \mathrm{w} \mathrm{HNO}_3$ solution if density is $1.4 \mathrm{~g} / \mathrm{mL}$?

In a chemical reaction, $A+B \longrightarrow A B$, if $B$ is acting as a limiting reagent, then choose the correct option.

Mixture of two bivalent metals $A$ and $B$ having mass $2 \mathrm{~g}$ when dissolved in $\mathrm{HCl}$ at STP, $2.24 \mathrm{~L}$ $\mathrm{H}_2$ is evolved. What is the mass of $A$ present in mixture? (Atomic mass of…

Assertion : One mole of $\mathrm{NaCl}$ contains $6.023 \times 10^{23}$ formula units of sodium chloride. Reason : $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ formula units of…

The normality of $10 \% \mathrm{H}_2 \mathrm{SO}_4$ solution having density $1.1 \mathrm{~g} / \mathrm{cc}$ is

$10 \mathrm{~mL}$ of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.

Assertion: One mole of $\mathrm{NaCl}$ contains $6.023 \times 10^{23}$ molecules of sodium chloride. Reason : $58.5 \mathrm{~g}$ of $\mathrm{NaCl}$ also contains $6.023 \times 10^{23}$ molecules of $\mathrm{NaCl}$.

How many significant figures are present in 0.0000135 ?

The amount of $\mathrm{BaSO}_4$ precipitated on mixing $\mathrm{BaCl}_2(0.5 \mathrm{M})$ with $\mathrm{H}_2 \mathrm{SO}_4(1 \mathrm{M})$ will correspond to

The number of atoms in $52 \mathrm{~g}$ of $\mathrm{He}$ is

Strength of $\mathrm{H}_2 \mathrm{O}_2$ is $15.18 \mathrm{~g} \mathrm{~L}^{-1}$, then it is equal to

Assertion : The molality of the solution does not change with change in tempe-rature. Reason : The molality is expressed in units of moles per $1000 \mathrm{~g}$ of solvent.