CBSE Champion Class 12 Chemistry. We covered all the CBSE Champion Class 12 Chemistry MCQs in this post for free so that you can practice well for the exam.
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CBSE Champion Class 12 Chemistry Objective for Students
Which kind of catalysis can be explained on the basis of adsorption theory?
(a) Homogeneous catalysis
(b) Heterogeneous catalysis
(c) Negative catalysis
(d) Autocatalysis
Option b – Heterogeneous catalysis
Physical adsorption becomes appreciable at:
(a) High temperature
(b) Room temperature
(c) Low temperature
(d) None of the above
Option c – Low temperature
When oil floats on water, the surface tension of water:
(a) Vanishes immediately.
(b) Decreases considerably.
(c) Increases considerably.
(d) Remains unaffected.
Option d – Remains unaffected
If detergent is added:
(a) Surface tension decreases.
(b) Surface tension increases.
(c) Surface tension can increase or decrease.
(d) No effect
Option a – Surface tension decreases
Which of the following is a heterogeneous mixture?
(a) Solution
(b) Suspension
(c) Both solution and suspension
(d) Neither solution nor suspension
Option b – Suspension
Which one of the following is not the result of surface tension?
(a) Vapor formation above the liquid surface.
(b) Convex shape of liquid meniscus.
(c) Liquid rising in a capillary.
(d) Spherical shape of mercury fallen on the floor.
Option a – Vapor formation above the liquid surface
Soaps clean surfaces based on the principle of:
(a) Viscosity
(b) Floatation
(c) Elasticity
(d) Surface tension
Option d – Surface tension
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