Chemistry
What is a common name for the substance which irritates lachrymal glands ?

Anaesthetic Gas
Laughing Gas
Noble Gas
Tear Gas

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Chemistry
Water cycle refers to

Scientific management of water in areas excessively plagued with water-logging
An integrated attempt to recycle water in relatively arid regions
Water distribution in relatively dry areas
Constant movement of water from ocean to land and back to ocean once again

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