G9 T2 Unit 1 Lesson 1

0 Most metal carbonates decompose by heating into metal and carbon dioxide.

• TRUE

• FALSE

7. On adding diluted hydrochloric acid to zinc a salt and water are formed.

• TRUE

• FALSE

9. Clear limewater turbids on passing oxygen gas through it.

• TRUE

• FALSE

6. Metals substitute oxygen of water to produce the metal hydroxide.

• TRUE

• FALSE

5. Some metals react with water to produce metal oxide and hydrogen gas evolves.

• TRUE

• FALSE

2. Most metal sulphates decompose by heating into metal oxide and nitrogen gas.

• TRUE

• FALSE

3. In C.A.S., metals are arranged in a descending order according to their atomic weights.

• TRUE

• FALSE

8. When adding magnesium pieces to copper sulphate solution, a black precipitate is

FORMED

• TRUE

• FALSE

1. In the thermal decomposition reactions, the compound decomposes by heat into its ..

• b. primary elements.

• a. simple components.

• d. all the previous answers.

• c. other compounds.

2. When we heat mercuric oxide, we get

....

• d. mercury and oxygen.

• a. mercuric oxide and water.

• b. mercuric oxide and oxygen.

• c. mercury and hydrogen.