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Q.

Which of the following solutions will be definitely basic?

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a

400 mL of 0.1 M NaOH is mixed with 100 mL of 0.4 M CH₃COOH.

b

Equal volumes of same % w/v of NaOH and H₂SO₄ solutions are mixed.

c

Different volumes of 0.2 M NaOH and 0.1 M HCl solutions are mixed.

d

Equal masses of same % w/w NaOH and HCl solutions are mixed.

answer is A, B.

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Detailed Solution

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Salt of weak acid and strong base formed
$∴$ basic
ii) $M = \frac{W}{V} % \frac{10}{M_{A}} = \frac{x \times 10}{40} for NaOH$
$\begin{array}{l} M = \frac{x \times 10}{98} for H_{2} {SO}_{4} \\ {(n_{f} MV)}_{NaOH} > {(n_{f} MV)}_{H_{2} {SO}_{4}} ∴ basic \end{array}$
iii) If volume of $NaOH < \frac{Volume of HCl}{2}$ then basic
iv) 40 gram NaOH means 1 mole NaOH and 40 gram HCI means $\frac{40}{36 .5} > 1$

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