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Chemistry

Chemistry
The maximum number of covalent formed by nitrogen is

2
4
1
3

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Chemistry
Which of the following fuels causes minimum environmental pollution?

Diesel
Kerosene
Hydrogen
Coal

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Chemistry
The buffer action of blood is due to the presence of

[HCO3]– and H2CO3
CI– and [HCO3]–
CI– and [CO3]2–
HCI and NaCI

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n-2
n
n2
n3

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Chemistry
Which of the following vegetable oils does not contain essential fatty acids ?

Groundnut oil
Mustard oil
Sunflower oil
Coconut oil

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Chemistry
The mass number of an atom is equal to

the number of protons and electrons
the number of neutrons
the number of nucleons
the number of protons

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