Some basic concepts of chemistry practice · Mixed difficulty

A quantity of $2.3 \mathrm{~g}$ of a mixture of $\mathrm{NO}_2$ and $\mathrm{N}_2 \mathrm{O}_4$ has a pressure of $0.82 \mathrm{~atm}$, at temperature $\text{T K}$ in a container of volume $\text{V}$ litres such that the ratio, $\text{T : V}$ is $300: 1$ in magnitude. What is the degree of dissociation of $\mathrm{N}_2 \mathrm{O}_4?$

Statement I : Values of R can be used to convert one energy parameter into another
Statement II : R has the dimension of work ${\text{mo}}{{\text{l}}^{{\text{ - 1}}}}\,\,{{\text{K}}^{{\text{ - 1}}}}$.
Which statement(s) is/are correct?

$\mathrm{NaClO}$ solution reacts with ${\mathrm{H}_2}\mathrm{S}{\mathrm{O}_3},as,\mathrm{NaClO} + {\mathrm{H}_2}\mathrm{S}{\mathrm{O}_3} \to \mathrm{NaCl} + {\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}$ A solution of $\mathrm{NaClO}$ used in the above reaction contained 15 g of $\mathrm{NaClO}$ per litre. The normality of the solution would be :

The prefix ${10^{18}}$ is

Which of the following is not a disproportion atom reaction

Assertion (A): Laboratory reagents are usually made up to a specific molarity rather than a given molality.

Reason (R): The volume of a liquid is more easily measured than its mass.

If $N_A$ is Avogadro's number then number of valence electrons in $4.2 \mathrm{~g}$ of nitride ions $\left(\mathrm{N}^{3-}\right)$ is

A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 mL of $C{O_2}$ at T = 298.15 K and $p = 1$ bar. If molar volume of $C{O_2}$ is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet?
[Molar mass of $NaHC{O_3} = \,84\,\,g\,\,mo{l^{ - 1}}]$

Number of significant figures in the answer of following will be:

$\frac{(29.2-20.2)\left(1.79 \times 10^5\right)}{1.39}$

How much $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2,$ in $\mathrm{mg},$ must be present in $50 \mathrm{~ml}$ of a solution with $2.35 \mathrm{~ppm}$ of $\mathrm{Ca}?$

A volume of $500 \mathrm{~ml}$ of a $0.1 \mathrm{~M}$ solution of ${AgNO}_3$ is added to $500 \mathrm{~ml}$ of $0.1 \mathrm{~M}$ solution of ${KCl}.$ The concentration of nitrate ion in the resulting solution is

Common salt obtained from sea-water contains $8.775 \% \mathrm{NaCl}$ by mass. The number of formula units of $\mathrm{NaCl}$ present in $25 \mathrm{~g}$ of this salt is :

What volume of 0.40 $M$ $\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}$ would be required to react with the ${\mathrm{I}_2}$ liberated by adding excess of KI to 50 mL of 0.20 $M$ $\mathrm{CuS}{\mathrm{O}_4}$ solution?

The chloride of a metal contains $52.8 \%$ chlorine by mass. The equivalent weight of metal is

What is the percentage of 'free $\mathrm{SO}_3$' in a sample of oleum labelled as $104.5 \%?$

Hydrazine ${N}_2 {H}_4$ (used as a fuel in rocket system) can be produced according to the following reaction.

${ClNH}_2+2 {NH}_3 \rightarrow {N}_2 {H}_4+{NH}_4 {Cl}$

When $1.0 \mathrm{~kg} \, {ClNH}_2$ is reacted with excess of ${NH}_3,$ $473 \mathrm{~g}$ of ${N}_2 {H}_4$ is produced. What is the percentage yield?

A closed vessel contains equal numbers of ${O_2}$ and ${H_2}$ molecules at same $T$. Which of the following is not true?

Volume of $\mathrm{O}_2$ required at STP to completely burn $3 \mathrm{~g}$ of ethane is

When $\mathrm{BrO}_3^{-}$ion reacts with $\mathrm{Br}^{-}$in acid medium, $\mathrm{Br}_2$ is liberated. The equivalent weight of $\mathrm{Br}_2$ in this reaction is:

$30 \mathrm{~mL}$ of $0.2 \mathrm{N} \mathrm{~BaC}{l}$ is mixed with $40 \mathrm{~mL}$ of $0.3 \mathrm{N} \mathrm{~A}{l}_2\left(\mathrm{SO}_4\right)_3$. How many $\mathrm{g}$ of $\mathrm{BaSO}_4$ are formed?

The weight of $1 \times 10^{22}$ molecules of ${CuSO}_4 \cdot 5 {H}_2 {O}$ is

The quantity which changes with temperature is 

Volume of $\mathrm{N}_2$ required at STP to produce 10 moles of $\mathrm{NH}_3$ through Haber's process is

Volume of one molecule of oxygen gas at S.T.P. is

Select the option having maximum number of carbon atoms among the following

A mixture contains $\mathrm{FeSO}_4$ and $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3.$ If both $\mathrm{FeSO}_4$ and $\mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3$ provide equal number of sulphate ions then, the ratio of $\mathrm{Fe}^{2+}$ and $\mathrm{Fe}^{3+}$ ions in mixture is

If 6.3 g of $NaHC{O_3}$ are added to 15.0 g $\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}$ solution, the residue is found to weight 18.0 g. what is the mass of $C{O_2}$ released in the reaction?

What is the percentage of carbon in calcium carbide $(Ca{C_2})$

Statement-I: Molarity of a solution does not depend upon temperature whereas molality depends.

Statement-II: Molarity and molality both depend only on the number of moles of solute particles.

If air contains ${\mathrm{N}_2}$ and ${\mathrm{O}_2}$ in volume ratio $4:1$. The average vapour density of air is: