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Chemistry

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

LD50
NOAEL
ADI
LC50

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Chemistry
In silvery paints, the main constituent present is

White lead
Lead powder
Silver powder
Aluminium powder

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Chemistry
Commercial nitric acid is coloured because it contains dissolved :

Nitrous oxide
Oxygen
Coloured impurities
Nitrogen dioxide

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Chemistry
Gypsum is used for improvement of:

Alkaline soils
Podsols
Acidic soils
Saline soils

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Chemistry
The material used in the manufacture of lead pencil is

Graphite
Carbon
Mica
Lead

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Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 6, 8, 4
2, 8, 10
2, 8, 8, 2
2, 10, 8

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