Transition and InnerTransition Elements - Result Question 49
####50. Potassium manganate $\left(K _2 MnO _4\right)$ is formed when $(1988,2 M)$
(a) chlorine is passed into aqueous $KMnO _4$ solution
(b) manganese dioxide is fused with $KOH$ in air
(c) formaldehyde reacts with potassium permanganate in the presence of strong alkali
(d) potassium permanganate reacts with conc. $H _2 SO _4$
Assertion and Reason
Read the following questions and answer as per the direction given below:
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true.
Show Answer
Answer:
Correct Answer: 50. (b, c)
Solution:
- $2 KOH+MnO _2+O _2 \stackrel{\Delta}{\longrightarrow} K _2 MnO _4+H _2 O$ $HCHO+KMnO _4+2 KOH \longrightarrow K _2 MnO _4+H _2 O$ $+HCOOH$
