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Chemistry

Chemistry
Which one of the following metals does not react with water to produce Hydrogen ?

Cadmium
Potassium
Sodium
Lithium

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Chemistry
Glycol is added to aviation gasoline because it

Reduces consumption of petrol
Prevents freezing of petrol
Reduces evaporation of petrol
Increases efficiency of petrol

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Chemistry
The major constituent of air is

hydrogen
carbon dioxide
nitrogen
oxygen

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Chemistry
Which amidst the following is not a gem stone ?

Opal
Pearl
Topaz
Cat's-eye

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Chemistry
The substance most commonly used as a food preservative is

Tartaric acid
Sodium carbonate
Acetic acid
Sodium salt of benzoic acid

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Chemistry
________ is a by product of sewage treatment and can be decomposed to produce biogas

Scum
Sludge
Sewer
Sewage

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