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Q.

0.023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is

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a

10

b

11

c

9

d

12

answer is D.

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Detailed Solution

2Na+2H2O⟶2NaOH+H2 2 mol   2 mol      2 mol For Na,n=0.02323=10−3mol ∵ therefore the no.of moles of NaOH is also  10-3 molarity = no.of moles of solutevolume of solution in litres POH=2, hence PH= 12
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