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Standard IX

Chemistry

Preparation of Dioxygen

A white-colou...

Question

A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

P b (N O_{3})_{2}

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P b C O_{3}

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B a C O_{3}

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Z n C O_{3}

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Solution

The correct option is B $Z n C O_{3}$
Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.

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A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

The correct option is B ZnCO3Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.

The correct option is B $Z n C O_{3}$
Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.