Solutions

According to Henry's law

P = K_H * mole fraction of solute

$0.92=46.82*1000*\frac{molof{O}_2}{55.5}$

$\therefore$ Mole of  O₂ = 1.09 * 10^-3

$\therefore Millimole=1.09\approx 1$

eq of ${\mathrm{H}}_2{\mathrm{O}}_2=$ eq of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$

$\begin{array}{rr}& =\frac{0.316}{158}*5=0.01\\ & =\frac{0.01*17}{0.2}*100=85\mathrm{\%}\end{array}$

Kindly go through the solution

Mass of solute ; w_B = 2.5 * 10^-3 kg

Mass of solvent, $w_A=75*10^{-3}kg$  

Boiling point of solution ; $T_b=373.535K$  

Boiling point of water ;  $T_b^0=373.15K$

So, elevation in boiling point, $\Delta T_b=T_b-T_b^0$  

$\Delta T_b=0.385K$                                                           

Using ; $\Delta T_b=K_b*\frac{w_B}{M_B*w_A}*1000$  

$0.385=0.52*\frac{2.5*10^{-3}}{M_B*75*10^{-3}}*1000$               

Molar mass of solute ; M_B = 45 g/mol

This is a assertion and reason answer type question as classified in NCERT Exemplar

(ii) Assertion and reason both are correct statements but reason is not correct

Explanation for assertion.

Explanation:  Assertion is correct statement but reason is a  wrong statement because a semipermeable membrane allows solvent molecules to move through a lower concentration solution to a higher concentration solution, osmosis is the flow of solvent molecules from the solvent side to the solution side through a semipermeable membrane.

This is a assertion and reason answer type question as classified in NCERT Exemplar

(i) Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation:  When a nonvolatile solute (such as NaCl) is added to water, a NaCl solution is created. When compared to pure water, the solution has a lower vapour pressure because there are less water molecules at the liquid's surface. A dip, or drop in the freezing point of water, is noticed as a result of this decrease in vapour pressure.

(i) Assertion and reason both are correct statements and reason is correct explanation for assertion.

Explanation: (i) In terms of 'Molarity (M), ' the number of moles of the solute dissolved per litre of solution is the strength of a solution.

(ii) Because the volume of a liquid changes with temperature, the volume of a solution changes as well, while the number of moles of solute in it remains constant (or unchanged). As a result, the molarity of the solution would be affected.

This is a matching answer type question as classified in NCERT Exemplar

(i)- (d);    (ii)- (c);    (iii)- (b);   (iv)- (e);    (v)- (a)

This is a matching answer type question as classified in NCERT Exemplar

(i)- (c);    (ii)- (e);    (iii)- (d);    (iv)- (a);    (v)- (b)