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Q73) Which of the following fluoride does not exist? [ MPCET 1993 ]




SOLUTION

Nitrogen can not show pentavalency
Answer: (a)


Q74) Brown colour in HNO3 can be removed by




SOLUTION


Answer: (d)


Q75) Read P can be obtained white P by [ Kernataka CET 1989]



SOLUTION

Heat red P in inert atomsphere at 240-250°C
Answer:(a)



Q76)A metal X on heating in nitrogen gas gives Y, Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives blue colour, Y is



SOLUTION

3Mg + N2 → Mg3N2
Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3 4NH3 + CuSO4 → [ Cu(NH3)4 ] SO4 ( is of blue colour)
Answer: (b)


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