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Chemistry

Chemistry
1 carat of diamond is equal to

100 mg
200 g
200 mg
100 g

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Mercury oxide and neon
Sodium vapour and neon
Mercury vapour and argon
Sodium oxide and argon

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Chemistry
Extensively used nitrogenous fertilizer is

Ammonium sulphate
Ammonium nitrate
Urea
Nitro-lime

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Chemistry
In which of the following ions , the colour is not due to d-d transition ?

[Ti(H2O)6]3+
[CrO4]2−
[CoF6]3+
[Cu(NH3)4]2+

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Chemistry
The nuclear particle having no mass and no charge, but only spin is

Neutrino
Proton
Meson
Electron

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Chemistry
The mass number of an atom is equal to

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

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