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:

  1. $2 KOH+MnO _2+O _2 \stackrel{\Delta}{\longrightarrow} K _2 MnO _4+H _2 O$ $HCHO+KMnO _4+2 KOH \longrightarrow K _2 MnO _4+H _2 O$ $+HCOOH$


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