MCQ
Which of the following solutions cannot act as a buffer
- A$Na{H_2}P{O_4} + {H_3}P{O_4}$
- B$C{H_3}COOH + C{H_3}COONa$
- ✓$HCl + N{H_4}Cl$
- D${H_3}P{O_4} + N{a_2}HP{O_4}$
✓
Answer
Correct option: C.
$HCl + N{H_4}Cl$
(c)A strong acid is not used to make a buffer.
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Consider the following reactions:
→$(i)$ $H_{(aq)}^+ + OH^-= H_2O_{(l)} ,$ $\Delta H = -X_1\,kJ \,mol^{-1}$
$(ii)$ $H_{2(g)} + \frac{1}{2}O_{2(g)} = H_2O_{(l)},$ $\Delta H = -X_2\,kJ \,mol^{-1}$
$(iii)$ $CO_{2(g)} + H_{2(g)} = CO_{(g)} + H_2O_{(l)},$ $\Delta H = -X_3\, kJ\, mol^{-1}$
$(iv)$ $ C_2H_{2(g)}+ \frac{5}{2} O_{2(g)} = 2CO_{2(g)} + H_2O_{(l)},$ $\Delta H = -X_4\,kJ \,mol^{-1}$
Enthalpy of formation of $H_2O_{(l)}$ is
$Y$ is
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