Question

A colourless, odourless, diatomic gas which is also a supporter of combustion is released by the thermal decomposition of
1.FeSO↓ 4
2.CaCO↓3
3.Pb (NO↓3)↓2
4.AgBr​

Answer 1

Answer:

3.lead(ii)nitrate

Explanation:

All nitrates decompose when heated to give oxygen and other products depending on the position of the metal on the reactivity series .

Oxygen is an odorless,colourless diatomic gas and it supports combustion

Heating of lead(ii)nitrate gives lead (ii)oxide,nitrogen ( iv )oxide and oxygen as the by products hence

It is the most suitable answer.

Answer 2

A colorless, odorless, diatomic gas which is also a supporter of combustion is released by the thermal decomposition of 3. Pb (NO₃)₂

Explanation:

• When lead (II) nitrate is heated, the compound disintegrates into lead oxide, nitrogen oxide and oxygen.
• The symbol of oxygen is O₂ which is a colorless and odorless gas.
• Every oxygen element has two oxygen atom, thus, it is diatomic gas.
• The vital gas required for combustion is oxygen. When the oxygen in the space is consumed due to combustion, the fire puts off if there is no oxygen.