TEACHER: SULEKHA RANI.R P.G.T. CHEMISTRY KENDRIYA VIDYALAYA

CLASS X MCQ CHEMISTRY

1. The correct way of reading the liquid level is shown in

(1) Figure A (2) Figure B (3) Figure C (4) Figure D

2. The odour of Ethanoic acid resembles with (1) Tomato juice (2) Kerosene (3) Orange juice (4) Vinegar.

3.. A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the samples taken was not proper. The teacher was referring to. (1) dilute hydrochloric acid (2) Tomato juice (3) Baking Soda (4) Soap solution

4. The figures below show set-ups for studying the reaction of zinc with sodium hydroxide

A rapid evolution of hydrogen gas will be observed in the test tube.

(1) I (2) II (3) III (4) IV

5. When iron nail is put in copper sulphate solution (1) Brown precipitate appears and the solution slowly turns green. (2) Black precipitate appears and the solution turns green. (3) Brown precipitate appears and the solution remains blue. (4) No change is observed

6. A student takes a substance ‘A’ which is attracted by a magnet and reacts with acids. He takes another substance ‘B’ which dissolves in carbondisulphide and reacts with hot concentrated nitric acid. He heats ‘A’ and ‘B’ together in a test tube to form AB. AB reacts with acid. He finds

out whether AB has been formed or not by

(1) Reacting the substance in the test tube with acid. (2) Using magnet (3) adding carbondisulphide to the reaction mixture. (4) both (2) and (3)

7 Three solutions A, B, and C were filtered. Solution A passed through the filter paper and the filtrate was clear. Solution B passed through the filter paper and the solution was translucent. Solution C left residue on the filter paper while the filtrate was clear. The relative size of the solute particles in the solutions A, B and C are

(1) A > B > C (2) A < B > C (3) A < B < C (4) A > B < C

8. Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below. You would observe the decomposition of metal on zinc in beakers:

(1) I and III (2) II and IV (3) I and II (4) III and IV

9. The pair of safety symbols you notice on the bottles of commercial acetic acid available in the laboratory, is shown in:

(1) I (2) II (3) III (4) IV.

10. The correct set up of apparatus for sublimation is

(1) 1 (2) 2 (3) 3 (4) 4

11. When solid lead nitrate is heated the residue left is

(1) white (2) light yellow (3) pink (4) black

12. A Student has taken three test tubes A,B and C with true solution, suspension and colloidal solution respectively. He viewed a coloured spot through each of them and through

each of them and through which test tube the coloured spot would not be visible

(1) A (2) B (3) C (4) D

13. When a mixture of iron filings and Sulphur powder is heated strongly the resultant product is a

(1) homogenous mixture (2) Heterogeneous mixture (3) compound (4) None of these

14. Which among the following is strongly acidic?

(1) NH4OH (2) Ca(OH)2 (3) NaOH (4) None of these

15. Which of the following is strongly acidic ?

(1) PH = 1 (2) PH = 5 (3) PH = 8 (4) PH = 10

16. The gas evolved when NaCO3 reacts with HCl is

(1) CO2 (2) SO2 (3) CO (4) H2

17. Four gas jars filled with So2 gas were inverted into troughs of water by four students and the following observations and inferences were reported

(i) Water did not enter the gas jar and sulphur dioxide is insoluble in water.

(ii) A small amount of water entered the gas jar slowly and sulphur dioxide is sparingly soluble in water

(iii) Water entered into the gas jar and sulphur dioxide is highly soluble in water.

(iv) Water did not enter the gas jar and sulphur dioxide is soluble

in water.

(1) I (2) II (3) III (4) IV

18. The mixture of common salt and sand can be separated by (1) Evaporation (2) Sedimentation followed by decantation (3) first dissolving in water followed by filtration and

crystallization (4) Dissolution in water, followed by crystallization19