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Chemistry

Chemistry
The gas which emits from rice field is

Ethane
Methane
All of these
Nitrogen

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Chemistry
Which of the following is used to remove ink and rust stains on cloth?

Alcohol
Ether
Oxalic acid
Kerosene oil

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Chemistry
Pyrethrin used in mosquito coil is obtained from

A fungus
A seed plant
An insect
A bacterium

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Chemistry
Extensively used nitrogenous fertilizer is

Ammonium sulphate
Urea
Ammonium nitrate
Nitro-lime

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Chemistry
When ice cubes are made, the entropy of water

May either increase or decrease depending on the process used
Increases
Decreases
Does not change

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Chemistry
Which one of the following is used as a sowing agent in the preparation of soft drinks?

Phosphoric acid
Salicylic acid
Boric acid
Phosphorus acid

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