Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

What type of colloid is formed when a gas is dispersed in a liquid? Give an example

How do you convert toluene to benzoic acid?

Define the following with an example

Denatured protein

Give reasons Dioxygen is a gas while Sulphur is a solid at room temperature.

How do you convert the following :

 Ethyne to Ethanal

How do you convert the following:

Acetic acid to Methane

Write the equations involved in the following reactions :

Stephen reaction

Write the equations involved in the following reactions :

Wolff-Kishner reduction

Calculate the mass of NaCl (molar mass = 58.5 g mol⁻¹) to be dissolved in 37.2 g of water to lower the freezing point by 2°C, assuming that NaCl undergoes complete dissociation. (K_f for water = 1.86 K kg mol⁻¹)

Calculate the mass of a compound (molar mass = 256 g mol⁻¹) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 K (K_f = 5.12 K kg mol⁻¹).

Write an important characteristic of lyophilic sols.

How do you prepare:

Na₂Cr₂O₇ from Na₂CrO₄?

 Write one example of a Natural polymer.

 Write one example of a thermosetting polymer.

Define the following term:
Denaturation of protein

Give reasons for the following:

Sulphur in vapour state shows paramagnetic behaviour.

Yellow colour of NaCl crystals in sodium vapour is due to ____________.

The following diagram shows:

Which of the following is a colligative property?

Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called ____________.