Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

161. The enthalpy of chemisorption is more _______ than the enthalpy of physio-sorption.

139 Views

162. Gel is a colloid in which the dispersion medium is __________.

129 Views

163. The movement of colloidal particles towards positive or negative electrode in an electric field is called ________.

154 Views

164. The size of colloidal particles ranges between _________ to _________.

273 Views

165. Soap acts as ________ in its cleansing action.

135 Views

166. Colloids represent a _______ of matter and not a class of substances.

133 Views

167. State whether the following statements are true (T) or false (F).

Starch in water behaves as a macro molecular colloid.

Physical adsorption is a spontaneous process.

The amount of gas adsorbed on charcoal increases with increase in temperature and pressure both.

Inversion of cane sugar in the presence of dilute sulphuric acid is an example of homogeneous catalysis.

A catalyst can initiate the reaction.

184 Views

168. State whether the following statements are true (T) or false (F).

The efficiency of protective colloid can be determined with the help of Hardy-Schulze rule.

Colloidal solutions show high value of osmotic pressure.

Low molecular mass impurities in a colloidal solution are removed by dialysis.

The phenomenon of adsorption had been used for creating partial vacuum.

Al₂(SO₄)₃ is less effective than MgSO₄ in coagulating As₂S₃ sol.

146 Views

169. State whether the following statements are true (T) or false (F).

In physiosorption, adsorption decreases with increase in temperature.

Catalysts increase the activation energy needed for the reaction.

Particles in a colloidal sol are big enough to scatter light.

A colloidal sol of (AlOH)₃ is more readily coagulated by 0.1 M Na,SO₄ than by 0.1 M NaCl solution.

Adsorption can increase continuously on increasing the temperature.

139 Views

170. Colloids can be purified by

181 Views