MCQ
1M NaCl and 1M HCl are present in an aqueous solution . The solution is:
- ANot a buffer solution with pH < 7
- BNot a buffer solution with pH > 7
- CA buffer solution with pH < 7
- DA buffer solution with pH > 7
Explanation:
Buffer can accept and donate protons at the same time and HC1is an acid. So, it has pH < 7.
So, this is not a buffer and the solution will be acidic.
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$CaC{O_3}\left( s \right)\overset \Delta \longleftrightarrow CaO\left( s \right) + C{O_2} \uparrow ,{K_p} = 8 \times {10^{ - 2}}$
$C{O_2}\left( g \right) + C\left( s \right) \rightleftharpoons 2CO\left( g \right),{K_p} = 2$

$\Delta\text{S}(\text{C}\rightarrow\text{D})=30\text{ev},$
$\Delta\text{S}(\text{B}\rightarrow\text{D})=20\text{ev}$
$\text{A}\rightarrow\text{B}\\\downarrow\ \ \ \ \ \uparrow\\\text{C}\rightarrow\text{D}$
The entropy change for A → B would be: