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Chemistry

Chemistry
When Hydrogen starts burning in air, it produces ?

Carbonic Acid
Ammonia
Methane
Water

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Chemistry
Silica gel is a

Flavouring agent
Drying agent
Moisturizer
Delicious food

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Chemistry
Magnetite is

Fe2O3
Fe3O4
FeCO3
2Fe2O3. 3H2O

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Chemistry
Hard water and soft water can be distinguished by using

Ordinary soap
Dilute acid
Detergent
Liquid soap

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Chemistry
Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives

Copper at anode and oxygen at cathode.
Copper at cathode and anodes dissolve to give copper
Copper at cathode and oxygen at anode
Hydrogen at cathode and oxygen at anode

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Chemistry
Poison used for killing rats is

Magnesium nitride (Mg3N2)
Calcium phosphide (Ca3P2)
Zinc phosphide (Zn3P2)
Magnesium phosphide (Mg3P2)

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