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To neutralise 20 ml of M/10 sodium hydroxide, the volume of M/20 hydrochloric acid required is
A. (a)10 ml
B. (b)15 ml
C. (c )20 ml
D. (d)40 ml

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Correct Answer - D
`NaOH" " HCl`
`N_(1)V_(1)=N_(2)V_(2), 20xx1/10=1/20xxV,V=40 ml`

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