ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Chemistry (Theory)

An aqueous solution containing 12.48 g of barium chloride (BaCl₂) in 1000 g of water, boils at 100.0832°C. Calculate the degree of dissociation of barium chloride. 
(K_b for water = 0.52 K kg mol⁻¹, at. wt. Ba = 137, Cl = 35.5)

An aqueous solution containing 12.50 g of barium chloride in 1000 g of water boils at 373.0834 K. Calculate the degree of dissociation of barium chloride.

Given K_b for H₂O = 0.52 K kg mol⁻¹; molecular mass of BaCl₂ = 208.34 g mol⁻¹.

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Van’t Hoff factor? What does it signify? [K_b = 0.52 K kg mol⁻¹]

Name the law or principle to which the following observations confirm:

When 9650 coulombs of electricity is passed through a solution of copper sulphate, 3.175 g of copper is deposited on the cathode (at. wt. of Cu = 63.5).

What is ferromagnetism?

What type of magnetism is shown in the following alignment of magnetic moments?

Define the following term:

Ferromagnetism

The complexion [Ni(CN)₄]^2- is:

Explain why:
(i) Transition elements form coloured compounds. 
(ii) Interhalogen compounds are more reactive than their constituent elements.
(iii) Cu⁺ is diamagnetic but Cu²⁺ is paramagnetic. (Z = 29)

Which one of the following compounds is diamagnetic and colourless?

Give a reason for the following:

Cu⁺² salts are paramagnetic, while Cu⁺ salts are diamagnetic.

The metal complex ion that is paramagnetic is ______.

(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)