MCQ
Which of the following aqueous solution has highest freezing point ?
- A$0.12\, m-Ca(NO_3)_2$ solution
- B$0.15\, m-NaCl$ solution
- ✓$0.2 \,\,m-$urea solution
- D$0.2 \,\,m-$CH_3COOH solution
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$(I)$ $CH_3CH_2CH_2Cl$ $(II)$ $\begin{array}{*{20}{c}} {C{H_2} = CH\,CH\,C{H_3}} \\ {\,\,\,\,\,\,\,\,\,\,|} \\ {\,\,\,\,\,\,\,\,\,\,Cl} \end{array}$
$(III)$ $\begin{array}{*{20}{c}} {C{H_3}C{H_2}\,CH\,C{H_3}} \\ {\,\,\,|} \\ {\,\,\,\,Cl} \end{array}$
[Atomic numbers of $Cr =24$ and $Mn =25$ ]
$(A)$ $Cr ^{2+}$ is a reducing agent
$(B)$ $Mn ^{3+}$ is an oxidizing agent
$(C)$ Both $Cr ^{2+}$ and $Mn ^{3+}$ exhibit $d^4$ electronic configuration
$(D)$ When $Cr ^{2+}$ is used as a reducing agent, the chromium ion attains $d^5$ electronic configuration
