Qualitative Analysis - Result Question 59

####62. A colourless inorganic salt (A) decomposes completely at about 250C to give only two products (B) and (C), leaving no residue. The oxide (C) is a liquid at room temperature and neutral to moist litmus paper, while the gas (B) is a neutral oxide.

White phosphorus burns in excess of (B) to produce a strong white dehydrating agent. Write balanced equations for the reactions involved in the above process.

(1996, 3M)

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Solution:

A Inorganic salt 250CB Neutral   oxide +C Neutral oxide   (liquid) 

Oxide C is liquid and neutral to litmus, so it is H2O. White phosphorus burns in excess of B to give P4O10.

Therefore, B is N2O.

NH4NO3(A)ΔN2O+2H2O(l) P4+10N2OP4O10+10N2



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