Chemistry
A solution is

A solid dissolved in a liquid
A solid dissolved i water
A mixture of two liquids
A homogeneous mixture of two or more substances

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Chemistry
Peptization is a process of

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

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Chemistry
The mass number of a nucleus is

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

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