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Chemistry

Chemistry
What is the atomic number of Oxygen

8
5
12
22

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Chemistry
Of the following commonly used materials, the one that is not an alloy is

Bronze
Steel
Copper
Brass

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Chemistry
Citric acid is present in free form in

Milk
Apple
Lemon
Tamarind

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Chemistry
Nitrogen fixation is a process of

Utilisation of nitrogen gas
Conversion of organic nitrogen to proteins
Assimilation of nitrate
Conversion of molecular nitrogen to ammonia

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Chemistry
Commercial Vaseline is derived from

Petroleum
Plant gums
Wool wax
Coal tar

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Mercury oxide and neon
Sodium oxide and argon
Sodium vapour and neon
Mercury vapour and argon

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