A) The pH of one litre solution containing \[0.49g\]of \[{{H}_{2}}S{{O}_{4}}\]is \[2.0\]
B) The conjugate base of \[{{H}_{2}}S\] is \[{{S}^{2-}}\]
C) \[B{{F}_{3}}\]is a Lewis base
D) Phenolphthalein is colourless in basic medium
Correct Answer: A
Solution :
\[w=0.49g\] \[E=49\] \[V=1000mL\] \[\therefore \] \[N=\frac{w\times 1000}{E.V}\] \[=\frac{0.49\times 1000}{49\times 1000}=0.01N\] \[\therefore \] \[[{{H}^{+}}]=0.01\] \[\therefore \] \[pH=-\log [{{H}^{+}}]\] \[=-\log (1\times {{10}^{-2}})\] \[=2\]
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