Melting point of a substance
1) decrease on mixing impurities 2) increases with increasing pressure

3) decrease with increasing pressure

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Both 1 and 2 are correct

Only 1 is correct

Both 2 and 3 are correct

1,2,3 are correct

answer is C.

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Detailed Solution

we know

(i) for substances which expand on melting we get their melting points increased on increasing pressure.

(ii) Similarly for substances which contract on melting we get their melting points decreased on increasing pressure

(iii) upon adding impurities to a substance its melting point decreases

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