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Chemistry

Chemistry
The main constituent of biogas is

Oxygen
Methyl alcohol
Acetic acid
Methane

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Chemistry
The pH of lemon juice is expected to be

Equal to 7
Nothing can be predicted
More than 7
Less than 7

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

Boric acid
Phosphorus acid
Salicylic acid
Phosphoric acid

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Chemistry
When a bond is formed between two atoms, the energy of the system will

Remain the same
Increase
Decrease
May increase or decrease

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Chemistry
The most electropositive elements among the following is

Cs
Ca
Na
K

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Chemistry
Which of the following is used as a lubricant in heavy machines?

Phosphorus
Sulphur
Bauxite
Graphite

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