Assertion : Solution of Na2CrO4 in water is intensely coloured.
Reason : Oxidation state of Cr in Na2CrO4 is +VI.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A and R are false