Assertion : Solid potassium dichromate gives greenish yellow vapour with concentrated `H_(2) SO_(4)` and solid ammonium chloride.
Reason : The reaction of ammonium chloride with solide `K_(2) Cr_(2) O_(7)` and concentrated `H_(2) XO_(4)` produces chromyl chloride.
A. If both assetion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are ture but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.