Chemistry
The least preferred technique in the disposal of Municipal Solid Waste is

Composting
Land filling
Incineration
Bricketting

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Chemistry
The mass number of a nucleus is

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

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Chemistry
Peptization is a process of

Dispersing precipitates into colloidal solution
Purification of colloids
Precipitation of colloidal particles
Protection of colloidal solution

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