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Chemistry

Chemistry
What are the number of moles of CO2 which contains 16 g of oxygen?

0.2 mole
0.5 mole
0.25 mole
0.4 mole

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Chemistry
'Plaster of Paris' is made by partial dehydration of

Blue vitriol
Gypsum salt
Epsom salt
Green vitriol

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Chemistry
One property of ammonia is

It is a yellowish gas
Its aqueous solution turns red litmus blue
It is insoluble in water
It is a odourless gas

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Auatic fungi
Aquatic macrophytes
Effluents
Evapotranspiration

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Chemistry
A balloon filled with helium rises in air because

Helium pushes down on the air below the balloon
Helium is less dense than air
Air exerts an upward force on the balloon
The balloon is weightless

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Chemistry
Candle is a mixture of

Bees wax and stearic acid
Higher fatty acids and stearic acid
Paraffin was and stearic acid
Bees wax and paraffin wax

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