Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Write two advantages of fuel cell

Give reason Aromatic diazonium salts are more stable than aliphatic diazonium salts.

Why are alkyl halides insoluble in water?

The two O−O bond lengths in the ozone molecule are equal.

 What happens when AgCl is doped with 2? CdCl What is the name of this defect? 

 Write one example of a Natural polymer.

 Write one example of a thermosetting polymer.

A 4% solution(w/w) of sucrose (M = 342 g mol^–1) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol^–1) in water.
(Given: Freezing point of pure water = 273.15 K) 

Give a reason for the following :
Ozone is thermodynamically less stable than oxygen. 

A 4% solution(w/w) of sucrose (M = 342 g mol⁻¹) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol⁻¹) in water.
(Given: Freezing point of pure water = 273.15 K)

Define the following term:
Denaturation of protein

Give reasons for the following:
Ozone is thermodynamically less stable than oxygen.

Cryoscopic constant of a liquid is ____________.

Pure benzene freezes at 5.45°C. A 0.374 m solution of tetrachloroethane in benzene freezes at 3.55°C. The Kf for benzene is:

A 5% solution (by mass) of cane sugar in water has a freezing point of 271 K and a freezing point of pure water is 273.15 K. The freezing point of a 5% solution (by mass) of glucose in water is:

0.01 M solution of KCl and BaCl₂ are prepared in water. The freezing point of KCl is found to be – 2°C. What is the freezing point of BaCl₂ to be completely ionised?

The freezing point of equimolal aqueous solution will be highest for ____________.

Which of the following 0.10 m aqueous solutions will have the lowest freezing point?

A solution containing 1.8 g of a compound (empirical formula CH₂O) in 40 g of water is observed to freeze at –0.465° C. The molecular formula of the compound is (K_f of water = 1.86 kg K mol^–1):

Which observation(s) reflect(s) colligative properties?

(i) A 0.5 m NaBr solution has a higher vapour pressure than a 0.5 m BaCl₂ solution at the same temperature.

(ii) Pure water freezes at a higher temperature than pure methanol.

(iii) A 0.1 m NaOH solution freezes at a lower temperature than pure water.