1. . When a solution is heated, the water evaporates and solute:
(A) Evaporates too
(B) Left as residue
(C) Disappear
(D) Condense
2. . The solution will dissolve faster on increasing:
(A) Pressure
(B) Density
(C) Concentration
(D) Temperature
3. . If the surface area of solid decreases, the dissolving will be:
(A) Faster
(B) Slower
(C) Constant
(D) Medium
4. . Which of the following separation techniques is dependent on difference in volatility?
(A) Distillation
(B) Crystallization
(C) Magnetic separation
(D) Fractional crystallization
5. . Which of the following methods are applied to separate oxygen-rich components and nitrogen-rich components?
(A) Crystallization
(B) Zone melting
(C) Magnetic separation
(D) Distillation
6. . How is a mixture of iron and copper fillings separated?
(A) Magnetic separation
(B) Crystallization
(C) Evaporation
(D) Distillation
7. . The remaining solid on the filter paper is known as:
(A) Solution
(B) Stone
(C) Particles
(D) Residue
8. . Sublimation is a technique that helps chemists to:
(A) Break
(B) Purify
(C) Melt
(D) Freeze
9. . A mineral is called an ore if:
(A) A metal present in mineral is precious
(B) Metal can be extracted from it
(C) Metal can be extracted profitably from it
(D) Metal cannot be extracted from it
10. . Bauxite is an oxide ore of:
(A) Barium
(B) Boron
(C) Bismuth
(D) Aluminum