Chemistry
Gas released during Bhopal tragedy was :

Ethyl isothiocyanate
Sodium isothiocyanate
Potassium isothiocyanate
Methyl isothiocyanate

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Chemistry
The mass number of a nucleus is

always more than the atomic weight
the sum of the number of protons and neutrons present in the nucleus
a fraction
always less than its atomic number

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Chemistry
The lustre of the metals is because of

Reflection of light due to the presence of free electrons
High density, due to closed packing of atoms
High polish
Absorption of light due to the presence of cavities

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