Question

12. Write one equation each for decomposition reactions where energy is supplied
13. What is the difference between displacement and double displacement reaction
14. In the refining of silver, the recovery of silver from silver nitrate solution involve
the form of heat, light or electricity.
Write equations for these reactions.
displacement by copper metal. Write down the reaction involved.
15. What do you mean by a precipitation reaction? Explain by giving examples,
16. Explain the following in terms of gain or loss of oxygen with two examples each
(a) Oxidation
(b) Reduction
17. A shiny brown coloured element 'X on heating in air becomes black in colou
Name the element 'X' and the black coloured compound formed.
18. Why do we apply paint on iron articles?
19. Oil and fat containing food items are flushed with nitrogen. Why?
20. Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity
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Answer 1

Answer:

15. What do you mean by a precipitation reaction? Explain by giving examples,

16. Explain the following in terms of gain or loss of oxygen with two examples each

(a) Oxidation

(b) Reduction

17. A shiny brown coloured element 'X on heating in air becomes black in colou

Name the element 'X' and the black coloured compound formed.

18. Why do we apply paint on iron articles?

19. Oil and fat containing food items are flushed with nitrogen. Why?

20. Explain the following terms with one example each.

(a) Corrosion

(b) Rancidity