20 ml of 0-5 N HCl and 35 ml of 0-1 N NaOH are mixed- The resulting solution will beA- Turns phenolphthalein solution pinkB- turns methyl orange redC- NeutralD- Basic

The correct option is B turns methyl orange red Molarity = normality here. M × V of the acid = 20 × 0.5 = 10 mmol M × V of the base = 35 × 0.1 = 3.5 mmol Sinc ...

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Byju's Answer

Standard XII

Chemistry

Enthalpy of Neutralisation

20 ml of 0.5 ...

Question

20 ml of 0.5 N HCl and 35 ml of 0.1 N NaOH are mixed. The resulting solution will be

Turns phenolphthalein solution pink

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turns methyl orange red

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Neutral

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Basic

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Solution

The correct option is B
turns methyl orange red

Molarity = normality here.

$M \times V$ of the acid = $20 \times 0.5 = 10 m m o l$
$M \times V$ of the base = $35 \times 0.1 = 3.5 m m o l$

Since there are more moles of acid than the base, unreacted acid remains in the solution after neutralisation, making it acidic.
Acidic solutions turns methyl orange red.

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