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CHEMISTRY

Chemistry
Pyrethrin used in mosquito coil is obtained from

A bacterium
A seed plant
A fungus
An insect

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

Laughing Gas
Anaesthetic Gas
Noble Gas
Tear Gas

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Chemistry
The material used in solar cells contains

Caesium
Tin
Silicon
Thallium

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Chemistry
Which of the following is used to iodise common salt ?

Potassium iodide
Iodine
Sodium iodide
Potassium iodate

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Chemistry
A thick paste of cement, sand and water is called

Mortar
Concrete
Kiln
R.C.C.

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