Chemistry
Diamond is harder than graphite because of :

Difference in layers of atoms
Difference of crystalline structures
Tetrahedral structure of diamond
None of these

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

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

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