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Chemistry

311.

The first metal used by man was

Answer: B

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312.

Which gas is known as "Fuel of Future" ?

Answer: D

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313.

The method that cannot be used for removing permanent hardness of water is

Answer: D

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314.

The law of constant proportions was enunciated by

Answer: D

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315.

Biogas majorly contains ?

Answer: A

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316.

Who proposed first atomic theory ?

Answer: B

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317.

The substance that contains the maximum amount of nitrogen is ?

Answer: A

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Answer: C

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Answer: B

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320.

A particle which is similar to electron is

Answer: B

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