Question

45.
Mg(NH4)PO4, on ignition at 100-1100°C
gives:
(A) Magnesium phosphate
(B)
Magnesium hydroxide
(C)
Magnesium pyrophosphate
(D)
None of these​

Answer 1

Answer:

b), Magnesium hydroxide.......

Answer 2

Given : $Mg(NH 4)__{}PO_{} 4$ ignites at $100$ C

To find: Product on ignition

Explanation: We have magnesium ammonium phospahte which on ignition at above hundred degree celsius. It forms magnesium pyrophosphate ,ammonia and water.  The reaction is given as follows

$Mg(NH_{4} )PO_{4} .6H_{2} O-Mg_{2} P_{2} O_{7} +NH_{3} +H_{2} O$

The products formed are magnesium pyrophosphate, ammonia and water molecule.

The other products are not formed since the ignition process involves breaking of the reactant in different products. It just like a cracking process where the bigger reactants splits to give smaller products.

Hence the correct answer is option C