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
Both A and R is true and R is the correct explanation of A
A is false but R is true
A is true but R is false

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Chemistry
All isotopes of the same element have ________

The same atomic number but different atomic masses
Different atomic numbers and the same atomic mass
Different atomic numbers and different atomic mass
The same atomic number and the atomic mass

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