AP EAMCET Engineering 20 Apr 2019 Shift 2 Paper

From ammonia gas, moisture cannot be removed with the help of P4O10. It is due to the fact that P4O10 undergoes a reaction with ammonia gas. The reaction is shown below.
12NH3+P4O10+6H2O→4(NH4)3PO4
Therefore, both Assertion (A) and Reason (R) are correct and (R) is the correct explanation of ( A )