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Chemistry

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

NOAEL
LD50
ADI
LC50

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Chemistry
Cement containing excess amount of lime

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

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Chemistry
Which of the following elements is found in all organic compounds

Nitrogen
Oxygen
Calcium
Carbon

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Chemistry
In the electroplating of gold, the electrolyte used is

Gold nitrate
Potassium aurocyanide
Gold sulphate
Gold chloride

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Chemistry
Which of the following is a monoatomic gas?

Neon
Fluorine
Nitrogen
Oxygen

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Chemistry
Peroxyacetyl nitrate is a

Vitamin
Secondary pollutant
Plant hormone
Acidic dye

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