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Chemistry

Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Ammonia
Nitrates
Nitrogenase

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Chemistry
The antiseptic compound present in dettol is

Iodine
Enloroxylenol
Biothional
Cresol

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Chemistry
Which is the heaviest metal among the following?

Iron
Copper
Gold
Silver

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Chemistry
Chernobyl disaster is the result of pollution by

Oil spill
Radioactive waste
Acid rain
Carbon dioxide

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Chemistry
The most abundant element is

Nitrogen
Calcium
Silicon
Oxygen

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Chemistry
The two metal ions that cause hardness to water are:

Sodium, Potassium
Sodium, Calcium
Calcium, Magnesium
Sodium, Magnesium

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