Question

12. Write one equation each for decomposition reactions where energy is supplied in
the form of heat, light or electricity
13. What is the diference benveen displacement and double displacement reactions
Write equations for these reactions.
14 In the refining of silver, the recovery of silver from silver nitrate solution involved
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
lal Oxidation
(b) Reduction
17 A shiny brown coloured element X on heating in air becomes black in colour.
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​

Answer 1

Answer:

12.ZNO +C - - - - >ZN+CO

LIGHT. agcl - - - ag +cl

Electricity. 2H20---2h2+o2

Explanation:

13.displacement reaction in which one more reactive element in a compound replaces the less reactive one. Ex. H2O +MG - - - H2+MGO

double displacements in which the twi componds interchange their ion in an aqueous state. Ex. KBR +AGNO3-----KNO3+AGBR