Question

e. Do as directed : [5]
1. Complete and balance the following equations which takes place in the presence of heat :
i. HgO 
ii. ZnCO3 
2. Give a test to identify each gas evolved.
3. Name the liquid metal formed, by the effect of heat on one of the compound given above.

Answer 1

what are you telling not understand

Answer 2

Answer:

$\huge{\bold{Heya \: dost }}$

A single displacement reaction is a reaction in which the one or more elements replaces another element in a compound. Whereas in a double displacement reaction, there are two exchanges of ions between compounds resulting in two new compounds.

Consider 4 elements A, B, C & D. In a single displacement reaction, the mechanism would be as follows.

AB + C -> AC + B

Wherein C & B are pure elements and are exchanged forming 2 compounds with A.

Considering the case of a double displacement reaction:

AB + CD -> AC + BD