Question

which of the following pairs from compound metal + metal non metal + non metal metal + nonmetal also write the type of compounds formed​

Answer 1

Answer:

and graphite can show conductivity.

6. What are amphoteric oxides? Give two examples of amphoteric oxides.

Ans. The oxides which behave as acid as well as base are called amphoteric oxides e.g., Al2O3 and ZnO are amphoteric oxides; they both react with acid as Well as base to give salt and water.

7. Name two metals which will displace hydrogen from dilute acids and two metals which will not.

Ans. Metals which lie above Hydrogen in the activity series ie. Zn, Al, Mg can displace hydrogen from dilute acids, because they are more reactive than H2. Metals which lie below hydrogen in the activity series i.e. Cu, Ag, Au cannot displace hydrogen from dilute acids, because they are less reactive than hydrogen.

8. In the electrolytic refining of M, what would you take as the anode, the cathode and the electrolyte?

Ans. For electrolytic refining of M:

Impure metal M → will be anode

Pure sample of M → will be cathode

Electrolyte → Acidified, soluble salt of metal M

9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

(a) What will be the action of gas on

(i) dry litmus paper? (ii) moist litmus paper?

(b) Write the balanced chemical equation for the reaction taking place.

Ans. (a) (i) There will be no effect of gas on dry litmus paper.

(ii) Moist blue litmus paper turns red.

(b) (i) S + O2 → SO2

(ii) SO2 + H2O → H2SO3