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Chemistry

Chemistry
Pyrethrin used in mosquito coil is obtained from

A bacterium
A fungus
A seed plant
An insect

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Chemistry
Adding Cl2 to benzene in the presence of AlCl3 is an example of :

Addition reaction
None of the options
Elimination reaction
Substitution reaction

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Chemistry
Chernobyl disaster is the result of pollution by

Oil spill
Carbon dioxide
Acid rain
Radioactive waste

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

Multiple internal reflections
Highest refraction
Multiple surface reflections
Hundred percent transmission

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Chemistry
Which of the following type of coal has the lowest proportion of volatile matter ?

Peat
Lignite
Anthracite
Bituminous

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Chemistry
The value of gas constant R in Ergs deg–1 mole–1 is

8.314 × 107
8.413 × 107
4.183 × 107
8.341 × 107

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