MCQ
When ${H_2}S$ is passed through acidified $KMn{O_4},$ we get
  • A
    ${K_2}S{O_3}$
  • B
    $Mn{O_2}$
  • C
    $KHS{O_3}$
  • $Sulphur$

Answer

Correct option: D.
$Sulphur$
d
(d) $2KMn{O_4} + 3{H_2}S{O_4} + 5{H_2}S\, \to \,$

${K_2}S{O_4} + 2MnS{O_4} + 8{H_2}O + 5S$

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The number of pairs of the solution having the same value of the osmotic pressure from the following is

(Assume $100\%$  ionization)

$A.$ $0.500\,M\,C _2 H _5 OH ( aq )$ and $0.25\, M\, KBr ( aq )$

$B.$ $0.100\,M\,K _4\left[ Fe ( CN )_6\right]$ (aq) and $0.100\, M$ $FeSO _4\left( NH _4\right)_2 SO _4$ (aq)

$C.$ $0.05 \,M\, K _4\left[ Fe ( CN )_6\right]( aq )$ and $0.25\, M\, NaCl$ (aq)

$D.$ $0.15\, M\, NaCl ( aq )$ and $0.1\, M BaCl _2$ (aq)

$E.$ $0.02\, M\, KCl\, MgCl _{2 .} 6 H _2 O ( aq )$ and $0.05\, M$ $KCl ( aq )$

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${List-I }$  ${(Reactants) }$

${List-II }$  ${ Products }$

($A$)Phenol, $\mathrm{Zn} / \Delta$

$(I)$ Salicylaldehyde

($B$)Phenol, $\mathrm{CHCl}_3, \mathrm{NaOH}, \mathrm{HCl}$

$(II)$ Salicylic acid

($C$)Phenol, $\mathrm{CO}_2, \mathrm{NaOH}, \mathrm{HCl}$

$(III)$ Benzene

($D$)Phenol, Conc. $\mathrm{HNO}_3$

$(IV)$ Picric acid

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Oxidation of which of the following by air in presence of vanadium pentoxide gives phenol
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The electrochemical equivalent of magnesium is $0.126\,mg/C$. A current of $5\, A$ is passed in a suitable solution for $1$ hour. The mass of magnesium deposited will be ........... $\mathrm{gm}$
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