Chemistry
Assertion (A) : Synthetic detergents can lather wen in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

Both A and R is true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Both A and R is true and R is the correct explanation of A

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Chemistry
The mass number of a nucleus is

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

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