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Chemistry

Chemistry
Among the following, which is always found in free-state in nature?

Copper
Silver
Sodium
Gold

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Chemistry
Which of the following is used in making smoke bombs?

Carbon
Sulphur
Hydrogen
Phosphorus

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Chemistry
The major constituent of air is

carbon dioxide
hydrogen
oxygen
nitrogen

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Chemistry
An acid having basicity one is

Phosphoric acid
Disodium hydrogen phosphate
Sodium dihydrogen phosphate
Sodium phosphate

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Chemistry
The metal present in vitamin B12 is

Fe
Mo
Mg
Co

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Chemistry
The heat required to raise the temperature of body by 1 K is called

thermal capacity
water equivalent
None of these
specific heat

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