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Chemistry

Chemistry
The gas that usually causes explosions in coal mines is

Methane
Carbon monoxide
Hydrogen
Air

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Chemistry
The pH of lemon juice is expected to be

Equal to 7
More than 7
Less than 7
Nothing can be predicted

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Chemistry
Aqueous solution of which of the following is a good conductor of electricity

Ammonium acetate
Glucose
Acetic acid
Ammonia

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Chemistry
The aprotic solvent is

HF
NH3
C6H6
H2O

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Chemistry
An acid having basicity one is

Disodium hydrogen phosphate
Sodium phosphate
Phosphoric acid
Sodium dihydrogen phosphate

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Chemistry
'All the four quantum numbers of two electrons in an atom are not the same.' It is the law of –

Avogadro's Law
Exclusion Principle of Pauli
Uncertainty Principle of Hiesenberg
Hund's rule of maximum multiplicity

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