Question

Name the following 1 Alcoholic which is insoluble in cold water but soluble in hot water 2 a Weak Alkali 3 an acid use to eye wash 4 a gas which produce dense white fume with ammonia 5 a tribasic acid 6 a black metallic oxide which react with hydrochloric acid to give coloured solution 7 a colour of ppt.when NH4OH is added in FeCl3 8 a white insoluble oxide that dissolved when fused with caustic soda or caustic potash 9 a gas which turn lead acetate solution black 10 A dry agent for hcl gas
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Answer 1

1. A solid which is insoluble in cold water but soluble in hot water.

= Lead chloride

2. A weak alkali.

= Hydrazine

3. An acid used to wash eyes.

= Boric acid

4. A gas which produce dense white fumes with ammonia.

= Hydrogen chloride

5. A tribasic acid.

= Phosphoric acid

6. A black metallic oxide which react with hydrochloric acid to give coloured solution.

= Copper oxide

7. A colour of ppt. when NH4OH is added in FeCl3.

= Reddish-brown [Fe(OH)3]

NH4OH + FeCl3 → Fe(OH)3 + NH4Cl

8. A white insoluble oxide that dissolved when fused with caustic soda or caustic potash.

= Zinc oxide

9. A a gas which turn lead acetate solution black.

= Sulphur dioxide

10. A dry agent for hcl gas.

= Sulphuric acid