Ncert Solutions Chemistry Class 11th

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Option(iii)

The equation for weak acid and weak base is given as-

pH=7+ $\frac{1}{2}$  ?(pKa?−pKb?)

K_a=1.8×10^-5

pK_a=−log (1.8×10-5) =5−log1.8 =4.744

pK_b?=−log (1.8×10-5) =4.744

pH=7+ $\frac{1}{2}$  ?(pKa?−pK_b?) =7

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (i)

pH for weak acid is given by the following equation:

pH= $\frac{1}{2}$ [pK_a−logC]

= $\frac{1}{2}$ [−log (1.74×10⁻⁵)−log0.01]

=3.4

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

Peroxodisulphate, obtained by electrolytic oxidation of acidified sulphate solutions at high current density, on hydrolysis yields hydrogen peroxide.

2HSO₄^- (aq) → HO₃SOOSO₃ 2HSO₄^- (aq)+2H⁺ (aq)+H₂O₂ (aq)

This method is now used for t

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iv)

Aqueous ammonia will absorb chloride ions and thus the equilibria will shift in forward direction and solubility of silver chloride will increase.

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

Heavy water can be made by electrolyzing water repeatedly or as a by-product in the fertiliser industry. It's a deuterium compound that's used to make other deuterium compounds.

Physical Properties of H₂O and D₂O

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

When 0.1 mol dm^-3 NH₄OH and 0.05 mol dm^-3 HCl react total amount of HCl reacts with NH₄OH to form NH₄Cl and some NH₄OH will be left unreacted. Thus, the resultan

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: option (iii)

 BF₃ is an electron deficient species that is why it is a Lewis acid. (all Lewis acid can accept a pair of electrons.

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

(a) Electron deficient hydrides are those that lack sufficient number of electrons to form typical covalent bonds. Group 13 hydrides, for example (BH₃, AlH₃, etc.).

(b) Electron precise: Electron precise hydrides are those that hav

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Option(i)  

H₂S?H⁺ +H^S− K_a1

HS−?H⁺+S²− K_a2

H₂S?2H⁺+S²− K_a3

K_a1= $\frac{\left[{\mathrm{H}\mathrm{S}}^{-}\right]\left[{\mathrm{H}}^{+}\right]}{\left[{\mathrm{H}}_2\mathrm{S}\right]\mathrm{}}$

K_a2= $\frac{\left[{\mathrm{H}\mathrm{S}}^{-}\right]\left[{\mathrm{H}}^{+}\right]}{\left[{\mathrm{H}}_2\mathrm{S}\right]\mathrm{}}$

K_a3=K_a1.K_a2