CLASS - X (Acid Base and Salt) work sheet-1

1. Washing soda has the formula
(a) Na2CO3.7H2O (b) Na 2CO3 .10H2 O (c)  Na2 CO3 .H2 O (d)  Na 2CO3

2. Plaster of Paris hardens by
(a)Giving off  CO2 (b)Changing into  CaCO3 (c) Combining with water (d) Giving out water

3. Which of the following is evolved when Na 2CO3 is heated?
(a) CO2 (b) CO (c) O2 (d) NO

4. A drop of liquid sample was put on the pH paper, paper turned blue. The liquid
sample must be of
(a) Lemon Juice
(b) HCl
(c) Sodium bicarbonate
(d) Ethanoic acid.

5. If pH of solution is 13, it means that if is
(a) Weakly acidic (b) Weakly basic (c) Strongly acidic (d) Strongly Basic

6. Why does not an acid show any acidic behavior is the absence of water?

7. Fresh milk has a pH of 6. What will be the PH value if milk changes into a curd Justify.

8. What is the reaction between hydrogen in concentration ion concentration of an aqueous solution and pH?

9. How will you show that acetic acid is monobasic acid