Question

All of the following compounds decompose just by heating, except


CaCO3


FeSO4


AgBr


Pb(NO3)2

Answer 1

$\huge \mathfrak{Right answer is:-}$

FeSO4 ❤️

Answer 2

Answer:

The correct answer is $\bold{\text{AgBr}}$ (Silver bromide).

Explanation:

• Among all the above, $\bold{\text{AgBr}}$ (Silver bromide) does not decompose on heating. Instead, Silver bromide decomposes when exposed to light.
• Instead of thermal decomposition, it shows photochemical decomposition.
• AgBr is a photosensitive compound.
  
• The reaction is known as the photolysis reaction.

                      $2 AgBr(s) \longrightarrow 2 Ag(s) + Br_{2} (g)$

• $\bold{\text{AgBr}}$ (Silver bromide) gets decomposed to give silver metal and bromine gas. Due to its sensitivity to light, AgBr is used to make photographic films.
  

To summarize, all the above options decompose on heating except $\bold{\text{AgBr}}$ (Silver bromide).