Sample PAPER-2

  PHYSICAL SCIENCE

ACIDS BASES AND SALTS

I.ANSWER THE FOLLOWING.   12 X 1/2 = 6M

1.  Which one of the following is acidic?

(a) Lemon juice    (b) Tomatoes    (c) Milk    (d) All

2.  Which one of the following will turn red litmus blue?

(a) Vinegar    (b) Baking soda solution    (c) Lemon juice    (d) Soft drinks

3.  Which one of the following will turn blue litmus red?

(a) Vinegar    (b) Lime water    (c) Baking soda solution    (d) Washing soda solution

4.  Methyl orange is

(a) Pink in acidic medium, yellow in basic medium

(b) Yellow in acidic medium, pink in basic medium

(c) Colourless in acidic medium, pink in basic medium

(d) Pink in acidic medium, colourless in basic medium.

5.  Lime water is

(a) CaO    (b) Ca(OH)2    (c) CaCO3    (d) CaCI2

6.  The nature of calcium phosphate is present in tooth enamel is

(a) Basic    (b) Amphoteric    (c) Acidic    (d) Neutral

7.  Which of the following salts has no water of crystallization?

(a) Blue vitriol    (b) Washing soda    (c) Baking soda    (d) Gypsum

8.  The function of quick lime in soda lime mixture is to

(a) Absorb moisture present in soda lime

(b) Increase the efficiency of soda lime

(c) Increase the pH of soda lime

(d) Take part in reaction with NaOH

9.  The Ph of a solution of HCL is 4. This shows that the molarity of the solution is

(a) 4.0M    (b) 0.4M    (c) 0.0001M    (d) 0.001M

10.  The difference of molecules of water in gypsum and PoP is

(a)5/2    (b) 2b    (c) 3/2    (d) ½

11.  Which of the following does not form an acidic salt?

(a) Phosphoric acid    (b) Carbonic acid    (c) Hydrochloric acid    (d) Sulphuric acid

12.  The chemical formula of caustic potash is

(a) NaOH    (b) Ca(OH)₂    (c) NH₄OH    (D) KOH

II. ANSWER THE FOLLOWING QUESTIONS                                                          4 X 1 = 4M

13. What is dilution?

14. Write the uses of washing soda?

15. What is tooth decay?

16. Write the characteristics of acids and bases?

III ANSWER THE FOLLOWING QUESTIONS                                                       4 X 2= 8M

17. What is neutralisation reaction?

18. Write the uses of plaster of paris?

19. Write the reaction of acids and base react with metals?

20. Why plaster of paris is stored in moisture proof container?

IV ANSWER THE FOLLOWING QUESTIONS                                                     3 X 4 =12M

21. What is water of crystallisation? write an activity to explain it?

22. Compounds such as alcohol and glucose though contain hydrogen are not categorised as acids why? explain with an activity?

23. Write any activity to show that acids react with metals?