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Chemistry

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

Phosphorus
Sulphur
Bauxite
Graphite

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Chemistry
What happens when a chemical bond is formed ?

Energy is neither released nor absorbed
Energy in always released
Energy is always absorbed
More energy is released than is absorbed

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Chemistry
When Hydrogen starts burning in air, it produces ?

Carbonic Acid
Methane
Water
Ammonia

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Chemistry
Calcium salts used as fertilizer is :

Calcium Sulphate
Calcium Carbonate
Calcium Carbide
Calcium Cyanide

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Chemistry
In the periodic table of elements, on moving from left to right across a period, the atomic radius

Increases
Does not follow a definite pattern
Remains unchanged
Decreases

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Chemistry
Which one of the following forms of phosphorus is most reactive?

Black phosphorus
White phosphorus
Violet phosphorus
Red phosphorus

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MORE MCQ ON Chemistry

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