1. When two or more different
substances are mixed in any proportion such that no chemical reaction takes
place, the product so formed is called _________.
(A) impure substance
(B) mixture
(C) colloid
(D) suspension
2. 2 g of powdered copper
sulphate is added to 20 mL of water and the contents throughly stirred. The
products so obtained is called _________.
(A) colloidal solution
(B) heterogeneous solution
(C) homogeneous solution
(D) none of these
3. Which is a homogeneous
mixture?
(A) Fruit juice
(B) Mixture of iron and sulphur
(C) Mixture of sand and sugar
(D) Brass
4. Which is a heterogeneous
mixture?
(A) Sulphur dissolved in carbon
disulphide
(B) Iodine dissolved in carbon
tetrachloride
(C) Starch dissolved in water
(D) Common salt solution
5. A homogeneous mixture of two
or more substances is called _________.
(A) suspension
(B) solvent
(C) solution
(D) colloidal solution
6. Sugar dissolves in water to form
a homogeneous mixture. In this mixture _________ is the solvent..
(A) sugar
(B) water
(C) sugar solution
(D) none of these
7. Sulphur dissolves in carbon
disulphide to form a homogeneous mixture
(A) sulphur is the solute
(B) carbon disulphide is the solute
(C) both (A) and (B) are solutes
(D) neither (A) nor (B) is
solute.
8. Which one among the following
is an example of a solid-solid solution?
(A) A mixture of sugar and sand
(B) Solution of iodine in ethyl
alcohol
(C) Solution of acid and water
(D) Brass
9. Which one of the following is
an example of a solid-liquid solution?
(A) Tincture of iodine
(B) Molten copper and zinc
(C) Vinegar
(D) Soda water
10. Which one is a liquid-liquid
solution?
(A) Ammonium hydroxide
(B) Dilute sulphuric acid
(C) Fuel mixture of petrol car
(D) Soda water
11. Which one is a liquid-gas
solution?
(A) Aerated water
(B) Dilute acetic acid
(C) Tincture of iodine
(D) Glucose solution
12. Bell metal is a solid solution of 80% copper and 20% tin. In bell metal:
(A) tin is the solvent and copper is the solute.
(B) copper is the solvent and tin is the solute.
(C) both copper and tin are the solvents.
(D) both copper and tin are the solutes.
13. A solution in which the particles of the solute are broken down to such a fine state, that they cannot be seen under the most powerful microscope is called _________.
(A) colloidal solution
(B) saturated solution
(C) true solution
(D) none of the above
14. The diameter of the particles in a true solution is:
(A) less than 1 nm.
(B) between 10 nm and 1 nm.
(C) between 1 nm and 100 nm.
(D) more than 100 nm.
15. Which is not a correct statement regarding a true solution?
(A) It is transparent to light.
(B) Its particle size is less than a nanometer.
(C) It is homogeneous in nature.
(D) The particles of solute can be recovered by the process of filtration.
16. When crystals of lead acetate and potassium iodide are grounded in a pestle and mortar no visible reaction takes place. However, when their true solutions in water are mixed, immediately a yellow precipitate of lead iodide is formed. It is because:
(A) water acts as a catalytic agent.
(B) water breaks the particles to molecular level.
(C) a large number of molecules of both the reactants come closer to one another and a chemical reaction takes place.
(D) both (B) and (C).
17. 20% common salt solution means:
(A) 100 g of common salt solution contains 20 g of common salt as solute.
(B) 100 g of water contains 20 g of common salt as solute.
(C) 120 g of common salt solution contains 20 g of common salt as solute.
(D) none of the above.
18. A solution is made by dissolving 25 g of sugar in 175 g of water. The concentration of sugar solution is:
(A) 15%
(B) 14.5%
(C) 12.5%
(D) 13.5%
19. 12% glucose solution is prepared by dissolving 50 g of glucose in water. The amount of water required is:
(A) 360.33 g
(B) 366.67 g
(C) 364.33 g
(D) 367.67 g
20. 20 g of acetic acid is dissolved in 250 mL of water. The concentration of the acid solution is:
(A) 8%
(B) 8.2%
(C) 9.4%
(D) 7.8% 21. At a given temperature, a solution which cannot dissolve more of the solute is called:
(A) saturated solution
(B) supersaturated solution
(C) true solution
(D) unsaturated solution
22. At a given temperature, a solution which can dissolve more of the solute is called _________.
(A) saturated solution
(B) true solution
(C) unsaturated solution
(D) supersaturated solution
23. An unsaturated solution of potassium nitrate at 40°C, can be saturated:
(A) by cooling the solution.
(B) by evaporating the solution.
(C) by adding more potassium nitrate.
(D) all of these
24. 21 g potassium nitrate dissolves in 100 g of water at 10°C. The solubility of potassium nitrate is:
(A) 21 g/100 g of water at 10°C
(B) 21 g/121 g of solution at 10°C
(C) 21 g/100 g of water
(D) none of these
25. The solubility of a saturated solution at some known temperature on heating:
(A) increases
(B) decreases
(C) remains same
(D) none of the above
26. When the temperature of a saturated solution is raised it:
(A) becomes super-saturated
(C) remains saturated
(C) remains same
(B) becomes unsaturated
(D) none of the above
27. A saturated solution at 80°C is cooled to 20°C. During the fall in temperature:
(A) the solution remains saturated .
(B) crystals of solute appear at its base.
(C) the solubility of the solute decreases.
(D) all of these
28. The solubility of potassium nitrate is 62 g / 100 g of water at 313 K. The amount of potassium nitrate required to prepare its saturated solution at 313 K in 50g water is:
(A) 31 g
(B) 33 g
(C) 31.5 g
(D) 32.5 g
29. A heterogeneous mixture of insoluble particles of a solute which spreads throughout a solvent is called:
(A) colloidal solution
(B) heterogeneous mixture
(C) suspension
(D) none of these
30. Which is the incorrect statement regarding suspensions?
(A) The solute particles have a tendency to remain suspended in the solvent.
(B) The diameter of the suspended particles is more than 100 nm.
(C) The particles of solute can be filtered out.
(D) The path of light through a suspension is visible.
Ans: 1. (B) 2. (C) 3. (D) 4. (C) 5. (C) 6. (B)
7. (A) 8. (D) 9. (A) 10. (B) 11. (A) 12. (B) 13. (C)
14. (A) 15. (D) 16. (D) 17. (A) 18. (C) 19. (B) 20. (A)
21. (A) 22. (C) 23. (D) 24. (A) 25. (A) 26. (B) 27. (D)
28. (A) 29. (B) 30. (A)