A) The pH of one litre solution containing 23 0.49 g of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]is 2.0
B) The conjugate base of \[{{\text{H}}_{2}}S\]is \[{{\text{S}}^{2-}}\]
C) \[\text{B}{{\text{F}}_{\text{3}}}\]iS a Lewis base
D) Phenolphthalein is colourless in basic medium
Correct Answer: A
Solution :
\[w=0.49\,g\] \[E=49\] \[V=1000\,mL\] \[\therefore \] \[N=\frac{w\times 1000}{E.V}\] \[=\frac{0.49\times 1000}{49\times 1000}\] \[=0.01\,N\] \[\therefore \] \[[{{H}^{+}}]=0.01\] \[\therefore \] \[pH=-\log [{{H}^{+}}]\] \[=-\log 0.01\] = 2
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