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Chemistry

Chemistry
The lightest gas which is non-inflammable is

Oxygen
Nitrogen
Hydrogen
Helium

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Chemistry
Domestic cooking gas consists mostly of

Hydrogen and acetylene
Methane and ethane
Ethylene and carbon monoxide
Liquified butane and isobutane

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Chemistry
Philosopher’s wool is chemically

Calcium oxide
Zinc oxide
Magnesium oxide
Aluminium oxide

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Chemistry
Concentration of a material which is lethal to 50% animal is called

NOAEL
ADI
LC50
LD50

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Chemistry
Pyrethrin used in mosquito coil is obtained from

A fungus
A seed plant
An insect
A bacterium

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Chemistry
Which of the following is not present in RNA

Ribose
Phosphate
Thymine
Uracil

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