Question

Consider the following statements:
(a) Green crystals of ferrous sulphate become dirty white upon strong heating.
(b) The chemical formula of aluminium phyosphate is $Al(P{O}_4{)}_3$.
(c) Silver salts are mostly sensitive to light.
(d) The gas released in respiration is oxygen.
Which of the above statement is correct?

• A. (a)
• B. (b)
• C. (c)
• D. (d)

Answer 1

The correct option is C (c)

Silver salts are mostly sensitive to light.
On exposing any silver salt to the atmosphere it gets oxidised to silver oxide, that is the reason for grey colour of the salt. Silver compounds have the tendency of decomposing in the presence of light.
They decompose to give silver metal which eventually forms the colours in the presence of light.