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Chemistry

Chemistry
Laughing gas is

Nitric oxide
Nitrogen pentoxide
Nitrous oxide
Nitrogen trioxide

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Silicosis
Asthma
Cancer
Pneumoconiosis

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Chemistry
Iron is prevented from rusting by coating with zinc. This process is called as

Galvanisation
Corrosion
Sublimation
Reduction

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Chemistry
Diamonds are glittering and attractive because light incident on them undergoes

Multiple internal reflections
Multiple surface reflections
Highest refraction
Hundred percent transmission

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

500
50
200
100

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Chemistry
The minimum energy required for an effective collision is

Internal energy
Threshold energy
Free energy
Activation energy

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