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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Silicon
Magnesium
Iron

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

Alcohol
Kerosene oil
Oxalic acid
Ether

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Chemistry
Which of the following in automobile exhaust can cause cancer?

Carbon monoxide
Lead
Polyclinic hydrocarbons
Oxides of nitrogen

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Chemistry
Which of the following metals has least melting point ?

Silver
Mercury
Copper
Gold

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Chemistry
The unit of ionic product of water (Kw) is :

Mol-1 let-1
Mol-1 let-2
Mol2 let-2
Mol2 let-1

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Chemistry
The compound used in pricklyheat powder to prevent excessive sweating is

Sulphuric acid
Boric acid
Phosphoric acid
Carbonic acid

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