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Chemistry

Chemistry
Total number of naturally occurring elements

92
62
98
110

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Chemistry
Spontaneous change is one in there is:

A lowering of free energy
A lowering of entropy
Increase in free energy
An increase in Internal energy

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Chemistry
Among the following the hardest metal is

Tungsten
Iron
Platinum
Gold

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Chemistry
Which among the following is a carbohydrate ?

Cane-sugar
Nylon
Hydrogen peroxide
Turpentine

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Chemistry
When formaldehyde and potassium hydroxide are heated, we get

Methane
Methyl alcohol
Acetylene
Ethyl formate

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Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Nitrogenase
Nitrates
Ammonia

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