MHT CET · Chemistry · d and f Block Elements

When a mixture of manganese dioxide, potassium hydroxide and potassium chlorate is fused, the product obtained is

A $K_{2} S O_{4}$
B $K_{2} M n O_{3}$
C $K_{2} M n O_{4}$
D $K M n O_{4}$

Verified Solution

Answer & Solution

Correct Answer

(C) $K_{2} M n O_{4}$

Step-by-step Solution

Detailed explanation

When a mixture of manganese dioxide, potassium hydroxide and potassium chlorate is fused then potassium chlorate first decomposes to give potassium chloride and oxygen gas. The formed $O _2$ gas then reacts with $MnO _2$ and KOH to give $K_2 MnO _4$. The equations for the above reaction can be written as:
$2 KClO _3(s) \xrightarrow[ MnO _2]{\Delta} 2 KCl ( s )+3 O _2(g)$
$2 MnO _2+4 KOH + O _2 \rightarrow 2 K_2 MnO _4$$+2 H _2 O$

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From MHT CET

Explore more questions on app

Column I	Column II
Q.1. Telencephalon	a. Olfactory lobes
Q.2. Rhinencephalon	b. Cerebellum and pons varolli
Q.3. Mesencephalon	c. Crura cerebri and corpora quadrigemina
Q.4. Metencephalon	d. Cerebrum