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pH of a M NaOH is nearest to
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By Expert Faculty of Sri Chaitanya
a
10
b
slightly greater than 7
c
4
d
5
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Correct option is B
As the solution is very dilute [OH-] of water also to be taken into considerationTotal conc. of OH- in solution= OH-(from water) + OH(from NaOH)= 10-7(approx) + 10-10 = 10-71+0.001=1.001×10-7 pOH=-log1.001×10-7 =7-log1.001 =7-0.0004=6.999 pH=14-6.999=7.001,slightly greater than 7
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