HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Conjugate base for Bronsted acids H₂O and HF are ___________.

Which of the following fluro compounds is most likely to behave as a Lewis base?

Which of these is not likely to act as Lewis base?

Which of the following can act as Lowry – Bronsted acid as well as base?

What are Lewis acids and bases? Give two examples for each.

Discuss the Lowry – Bronsted concept of acids and bases.

Identify the conjugate acid-base pair for the following reaction in an aqueous solution.

\[\ce{HS^-_{( aq)} + HF ⇌ F^-_{( aq)} + H2S_{(aq)}}\]

Identify the conjugate acid-base pair for the following reaction in an aqueous solution.

\[\ce{HPO^{2-}_4 + SO^{2-}_3 ⇌ PO^{3-}_4 + HSO^-_3}\]

Identify the conjugate acid-base pair for the following reaction in an aqueous solution.

\[\ce{NH^+_4 + CO^{2-}_3 ⇌ NH3 + HCO^-_3}\]

Account for the acidic nature of HClO₄ in terms of Bronsted – Lowry theory, identify its conjugate base.

When aqueous ammonia is added to CuSO₄ solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, \[\ce{[Cu(H2O)6]^{2+}_{( aq)} + 4NH3_{( aq)} ⇌ [Cu(NH3)4]^{2+}_{( aq)}}\], among HO₂ and NH₃ Which is stronger Lewis base.

The number of electrons that have a total charge of 9650 coulombs is ____________.

The molar conductivity of a 0.5 mol dm⁻³ solution of AgNO₃ with electrolytic conductivity of 5.76 × 10⁻³ S cm⁻¹ at 298 K is ____________.

Calculate \[\ce{Λ^∘_{HOAC}}\] using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25°C.

Faradays constant is defined as ____________.

Which of the following electrolytic solution has the least specific conductance?

The equivalent conductance of `"M"/36` solution of a weak monobasic acid is 6 mho cm² equivalent⁻¹ and at infinite dilution is 400 mho cm² equivalent⁻¹. The dissociation constant of this acid is ____________.

A conductivity cell has been calibrated with a 0.01 M, 1 : 1 electrolytic solution (specific conductance (κ = 1.25 × 10⁻³ S cm⁻¹) in the cell and the measured resistance was 800 Ω at 25°C. The cell constant is, ____________.

Conductivity of a saturated solution of a sparingly soluble salt AB (1 : 1 electrolyte) at 298 K is 1.85 × 10⁻⁵ S m⁻¹. Solubility product of the salt AB at 298 K `(Λ_"m"^∘)_"AB"` = 14 × 10⁻³ S m² mol⁻¹.

Why does the conductivity of a solution decrease on dilution of the solution?