Some basic concepts of chemistry practice · Mixed difficulty

Which of the following is not a disproportion atom reaction

$3.92 \mathrm{~g}$ of ferrous ammonium sulphate react completely with $50 \mathrm{~mL} \frac{\mathrm{N}}{10} \mathrm{KMnO}_4$ solution. The percentage purity of the sample is

What volume of ${\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}$ solution is required to oxidise (in acid solution) a solution containing 10 g of $\mathrm{FeS}{\mathrm{O}_4}$? (mol.wt.of $\mathrm{FeS}{\mathrm{O}_4}$ = 152)

Which one of the following is the lightest?

Two oxides of a metal contain 50% and 40% metal (M) respectively. If the formula of fist oxide is $M{O_2}$, the formula of second oxide will be

An aqueous solution has urea and glucose in mass ratio $3: 1.$ If the mass ratio of water and glucose in the solution is $10: 1,$ then the mole fraction of glucose in the solution is

Which one of these is not a pure compound?

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

A 0.518 g sample of lime stone is dissolved in $HCl$ and then the calcium is precipitated as $\mathrm{Ca}{\mathrm{C}_2}{\mathrm{O}_4}$. After filtering and washing the precipitate, it requires 40.0 mL of $0.250N\mathrm{KMn}{\mathrm{O}_4},$, solution acidified with ${\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}$ to titrate is as, $\mathrm{MnO}_4^ - + {\mathrm{H}^ + } + {\mathrm{C}_2}\mathrm{O}_4^{2 - } \to \mathrm{M}{\mathrm{n}^{2 + }} + \mathrm{C}{\mathrm{O}_2} + 2{\mathrm{H}_2}\mathrm{O}$. The percentage of $\mathrm{CaO}$ in the sample is :

5 moles of $A{B_2}$ weight $125 \times {10^{ - 3}}kg$ and 10 moles of ${A_2}{B_2}$ weight $300 \times {10^{ - 3}}kg$. The molar mass of $A\left( {{M_A}} \right)$ and molar mass of $B\left( {{M_B}} \right)$ in kg $\mathrm{mo}{\mathrm{l}^{ - 1}}$ are

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(i) Gay-Lussac’s law of gaseous volumes is actually the law of definite proportion by volume.
(ii) Law of conservation of mass is true for physical change, but not for chemical change.
(iii) The percentage of oxygen in $H_2O_2$ is different from that in $H_2O.$ Hence, it violates law of definite proportions.
(iv) Fixed mass of A reacts with two different masses of B (say x and y), then the ratio of x/y can be any positive integer.
(v) At STP, 5 mL of $N_2$ and $H_2$ have different no. of molecules.

The empirical formula of acetic acid is the same as that of

Assertion (A) : Molality is independent of temperature.

Reason (R) : Volume of solution does not change with temperature.