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Q89) The brown colour ring obtained in ring test for nitrates is due to the formation of .. [ CPMT 1989]




SOLUTION

Brown ring of nitrates is due to FeSO4.No or [Fe(H2O)5NO]SO4
Answer: (c)


Q90) The oxidation state of Cr in K2Cr2O7 is .. [ CBSE PMT 1988]




SOLUTION


Answer: (c)


Q91) Mercury on heating with aqua regia gives [ MP PMT 1988]



SOLUTION

Hg + 3HCl + HNO3 → HgCl2 + NOCl + 2H2O
Answer:(b)



Q92) Mercury is purified by [ MP PMT 1987]



SOLUTION


Answer: (b)


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