ACID, BASES AND SALTS test paper,

ACID, BASES AND SALTS
MARKS-30                                                    
Instructions:
 Questions : 1 to 5 – 1 Mark each
 Questions : 6 to 9 – 2 Marks each
 Questions : 10 to 13 – 3 Marks each
 Question 14 – 5 Marks

1. Write the chemical name of baking soda.

2. What happens when gypsum is heated at 373K?

3. Which has a higher pH value 1M HCl or 1M NaOH solution?

4. Hydrogen ion concentration of an acid is 1 x 10-2 mol/l. what is 
its pH?

5. Name the gas formed when Sodium hydroxide reacts with Zinc

6. What is meant by ‗Water of Crystallisation‘ of a substance? Describe an activity to show that.

7. Why does tooth decay start when the pH of mouth is lower than 5.5?

8. What is baking powder? How does it make the cake soft and spongy?

9. Give Arrhenius definition of an acid and a base. Choose strong acid and strong base from the following: CH3COOH, NH4OH, KOH, HCl

10. What happens when nitric acid is added to egg shell? Give the chemical equation.

11. A student prepared solutions of an acid and a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?

12. How is plaster of Paris prepared? What is its chemical formula? Write is chemical name.

13. a) Define strong acid and weak acid.
b) A student working in the laboratory added some water to a syrupy liquid taken in tube.
The tube immediately cracked and the liquid escaped out, that produced blisters on the skin of the student. Why?

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