Which of the following solutions will be definitely basic?

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Equal volumes of same % w/v of NaOH and $H_{2} S O_{4}$ solutions are mixed.

Equal masses of same% w/w NaOH and $H C l$ solutions are mixed.

400ml of 0.1 M NaOH is mixed with 100 ml of 0.4 M $C H_{3} C O O H$

Different volumes of 0.2 M NaOH and 0.1 M $H C l$ solution are mixed.

answer is A, B.

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Detailed Solution

(i) $N a O H + C H_{3} C O O H \to C H_{3} C O O N a + H_{2} O$
0.4 × 0.1 0.100 × 0.4
0.04 mole 0.04 mole 0 0
0 0 0.04 mole 0.04 mole
Salt of weak acid and strong base formed basic
(ii) $M = \frac{W}{V} % \frac{10}{M_{A}} = \frac{x \times 10}{40} f o r N a O H$
$\begin{array}{l} M \frac{x \times 10}{98} f o r H_{2} S O_{4} \\ n_{f} M V_{N a O H} > {(n_{f} M V)}_{H_{2} S O} ∴ b a s i c \end{array}$
(iii) If volume of NaOH < $\frac{V o l u m e o f H C I}{2}$ then basic
(iv) 40 gram NaOH means 1 mole NaOH and 40 gram HCI means $\frac{40}{36.5} > 1$
Solution acidic in nature