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: D
Solution :
w = 0.49 g E = 49 V = 1000 mL \[\therefore \] \[N=\frac{w\times 1000}{E\cdot V}=\frac{0.49\times 1000}{49\times 1000}=0.01\,N\] \[\therefore \] \[[{{H}^{+}}]=0.01\] \[\therefore \] \[pH=-\log \,[{{H}^{+}}]\] \[=-\log \,(1\times {{10}^{-2}})=2\]
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