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Q.

Which of the following is correct?

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a

The PH of one litre solution containing 0.49g of H2SO4 is 2.0

b

The conjugate base of H2S is S2-

c

BF3 is a Lewis base

d

Phenolphthalein is colourless in basic medium

answer is A.

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Detailed Solution

H+ = N =0.4949=10-2 pH=-logH+ pH=2log10 PH = 2Conjugate base of H2S is HS¯BF3 is a lewis acidPhenolphthalein is pink in basic medium.
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