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Q361) When MnO2 is fused with KOH, a coloured compound is formed. the product and its colour is ..[ IIT screening test 2003]




SOLUTION

2MnO2 + 4KOH + O2 → 2K2MnO4(purple green) + 2H2O
Answer: (a)


Q362) Equivalent weight of K2Cr2O7 in acidic medium is [ haryana CEET 2003]




SOLUTION

K2Cr2O7 +4H2SO4 → K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]
Oxidation number of Cr reduced by 3 and Cr2 by 6 thus
Eq.mass of K2Cr2O7 = Mol. mass/ 6
Answer: (c)


Q363) Development of photographic plate involves the use of [ kerala MEE 2003]



SOLUTION


Answer:(a)



Q364) In the reaction
(NH4)2Cr2O7 → N2 + H2O + Cr2O3
the coefficient of H2O is ..[DPMT 2003]



SOLUTION

(NH4)2Cr2O7 → N2 + 4H2O + Cr2O3
Answer: (d)


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