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CHEMISTRY

Chemistry
Pyrethrin used in mosquito coil is obtained from

An insect
A seed plant
A bacterium
A fungus

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

Tear Gas
Anaesthetic Gas
Laughing Gas
Noble Gas

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Chemistry
The material used in solar cells contains

Silicon
Caesium
Tin
Thallium

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

Iodine
Potassium iodate
Sodium iodide
Potassium iodide

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

Kiln
R.C.C.
Mortar
Concrete

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