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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Potassium manganate is not formed in
  • A
    $KMnO \xrightarrow{\Delta }$
  • B
    $KMn{O_4} + \mathop {KOH}\limits_{\left( {conc.} \right)} \xrightarrow{\Delta }$
  • C
    $Mn{O_2} + KOH + {O_2}\xrightarrow{\Delta }$
  • ✓
    $KMn{O_4} + \mathop {{H_2}S{O_4}}\limits_{\left( {conc.} \right)} \xrightarrow{\Delta }$
✓

Answer

Correct option: D.
$KMn{O_4} + \mathop {{H_2}S{O_4}}\limits_{\left( {conc.} \right)} \xrightarrow{\Delta }$
d
$2 \mathrm{KMnO}_{4} \stackrel{\Delta}{\longrightarrow} \mathrm{K}_{2} \mathrm{MnO}_{4}+\mathrm{MnO}_{2}+\mathrm{O}_{2}$

$4 \mathrm{KMnO}_{4}+4 \mathrm{KOH} \stackrel{\Delta}{\longrightarrow} 4 \mathrm{K}_{2} \mathrm{MnO}_{4}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O}$

$2 \mathrm{MnO}_{2}+4 \mathrm{KOH}+\mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{K}_{2} \mathrm{MnO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$

$\mathrm{KMnO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{con}) \stackrel{\Delta}{\longrightarrow} \mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{Mn}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{O}$

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