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प्रश्न
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is ______.
विकल्प
Magnesium nitrate
Calcium nitrate
Barium nitrate
Strontium nitrate
उत्तर
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is calcium nitrate.
Explanation:
\[\ce{2Ca(NO3)2 -> 2CaO + 4NO2 + O2}\]
NO2 is a brown gas. Ca2+ imparts brick red colour to the flame.
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\[\ce{Y <-[\Delta, 205°C] CaSO4.2H2O ->[\Delta, 120°C] X}\]
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