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Chemistry

Chemistry
PH value between 6.5-7.5 makes the soil

None of these
Neutral
Acidic
Basic

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

ADI
LD50
NOAEL
LC50

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Chemistry
Percentage of lead in lead pencils is

31-66
80
40

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Chemistry
Carborundum is another name of

Silicon oxide
Calcium oxide
Silicon carbide
Calcium carbide

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Chemistry
Ultraviolet radiation striking the earth is due to the depletion of

Ozone
Carbon monoxide
Carbon dioxide
Oxygen

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