Assertion (A) : An iron ball floats on mercury but gets immersed in water. 

Reason (R) : The specific gravity of iron is more than that of mercury. 

Codes: 

(a) Both A and R are true and R is the correct explanation of A 

(b) Both A and R are true but R is not a correct explanation of A 

(c) A is true but R is false 

(d) A is false but R is true

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1 Answers

(c) Statement 1 is true but statement 2 is false. Specific gravity is the ratio of the density (mass of a unit volume) of a substance to the density (mass of the same unit volume) of a reference substance. Mercury has a specific gravity of 13.56 whereas specific gravity of iron is 7.21.Thus, iron ball floats on mercury.

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