Transition and InnerTransition Elements - Result Question 49

####50. Potassium manganate (K2MnO4) is formed when (1988,2M)

(a) chlorine is passed into aqueous KMnO4 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. H2SO4

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. 2KOH+MnO2+O2ΔK2MnO4+H2O HCHO+KMnO4+2KOHK2MnO4+H2O +HCOOH


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