Question

1. Which metal other than mercury is liquid at room temperature?

2. Why the item made of silver turns black when exposed to air?

3. Which non – metal is lustrous?

4. What is an amalgam?

5. What is the nature of oxides of metal?

6. Differentiate between the oxides of magnesium and sulphur.

7. Name one metal which is a poor conductor of heat



8. Give Reasons

a. Sodium and potassium are stored in kerosene

b. Ionic compounds have higher melting point

9. Differentiate between metals and non-metals based on

a. Malleability

b. Electrical conductivity

10. Give reasons for the following:

a. Na, K and Ca metals form hydrides by combination with hydrogen gas, but most other metals

do not.

b. Metals conduct electricity.

11. Write the equations for the reactions of:

a. Iron with steam.

b. Calcium and potassium with water.

12. What is activity series? How does it help us in predicting the relative reactivities of various

metals?

13. What is the difference between sodium atom and sodium ion.

14. What is anodizing? What is its use?​

Answer 1

Answer:

1 bromine is liquid at room temperature

2 due to silver oxide

3 iodine