Question

give 2 examples of a) thermal decomposition B) electrolytic decomposition C) photo chemical decomposition ​

Answer 1

Answer:

thermal decomposition

Answer 2

Answer:

(a) i) copper carbonate → copper oxide + carbon dioxide.

Copper carbonate is green and copper oxide is black. You can see a colour change from green to black during the reaction

(ii) begin mathsize 12px style CaCO subscript 3 left parenthesis straight s right parenthesis end subscript space rightwards arrow with increment on top space CaO subscript left parenthesis straight s right parenthesis end subscript space plus CO subscript 2 left parenthesis straight s right parenthesis end subscript end style (Thermal decomposition)

c) (i)begin mathsize 12px style 2 AgBr subscript left parenthesis straight s right parenthesis end subscript space rightwards arrow with Sunlight on top space 2 Ag subscript left parenthesis straight s right parenthesis end subscript space plus Br subscript 2 left parenthesis straight g right parenthesis end subscript end style (photochemical decomposition)

ii) This reaction is used for the preparation of oxygen.

(b) i) 2NaCI—>2Na (at cathode) +CI2 (at anode)

ii) 2H2O-> 2H2 + O2