Questions
Al salts on heating with in , charcoal cavity gives a white infusible residue. On moistening the same with a drop of cobalt nitrate, it changes to due to the formation of cobalt meta-aluminate (Thenard's blue)
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By Expert Faculty of Sri Chaitanya
a
Brown
b
Yellow
c
Blue
d
Lemon
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Correct option is C
Al+3+Na2CO3→NaAlO2white+CO2↑ Co(NO2)2+Al→Co(AlO2)2Blue+NO2
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