4. Dry hydrogen gas is passed over apowdered solid and then throughcooled U-tube before the excess ofhydrogen is burned in air.A colourless liquid collects in the U-tube.What could the powdered solid be?A calcium oxideB copper(II) oxideC magnesiumD zinc oxide

4. Dry hydrogen gas is passed over apowdered solid and then throughcoo

1.	4. Dry hydrogen gas is passed over apowdered solid and then throughcooled U-tube before the excess ofhydrogen is burned in air.A colourless liquid collects in the U-tube.What could the powdered solid be?A calcium oxideB copper(II) oxideC magnesiumD zinc oxide
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