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Chemistry

Chemistry
The gas that usually causes explosions in coal mines is

Carbon monoxide
Air
Hydrogen
Methane

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Chemistry
How many electrons can be accommodated in d-orbital

10
3
8
6

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Chemistry
Cement containing excess amount of lime

Becomes more strong
Is slow setting
Is quick setting
Cracks during setting

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Chemistry
What is the element required for solar energy conversion ?

Ultra pure carbon
Silicon
Beryllium
Tantalum

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Chemistry
Number of6.023 × 1020 atoms present in one mole of a gas at STP is

'6.023 × 10–23
6.023 × 1023
6.023 × 1020
'6.023 × 10–20

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Chemistry
Iodex, a pain relief balm, has the smell of ________ .

Butyl salicylate
Ethyl salicylate
Methyl salicylate
Propyl salicylate

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MORE MCQ ON Chemistry

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