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Standard X

Chemistry

Effect on Indicators by Acids and Bases

MnO2 when fus...

Question

$M n O_{2}$ when fused with KOH and oxidized in air gives a dark green compound X. In acidic X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and $M n O_{2}$ . The compounds X and Y. respectively, are

K_{2} M n O_{4} a n d K M n O_{4}

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M n_{2} O_{7} a n d K M n O_{4}

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K_{2} M n O_{4} a n d M n_{2} O_{7}

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K M n O_{4} a n d K_{2} M n O_{4}

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Solution

The correct option is A $K_{2} M n O_{4} a n d K M n O_{4}$
$2 M n O_{2} + 4 K O H + O_{2} \to 2 K_{2} M n O_{4} + 2 H_{2} O$
$3 K_{2} M n O_{4} + 4 H C l \to 2 K M n O_{4} (P u r p l e) + M n O_{2} + 4 K C l + 2 H_{2} O$

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Similar questions

$M n O_{2}$ when fused with KOH and oxidized in air gives a dark green compound X. In acidic X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and $M n O_{2}$ . The compounds X and Y respectively, are

Q. When

M n O_{2}

is fused with

K O H

in the presence of

K N O_{3}

as an oxidizing agent, it gives a dark green compound (A).
Compound (A) disproportionates in acidic solution to give purple compound (B).
An alkaline solution of compound (B) oxidises

K I

to compound (C) whereas an acidified solution of compound (B) oxidises

K I

to (D). Identify (A), (B), (C), and (D).

Q. Choose the correct answer from the alternative given.
When an oxide of manganese (P) is fused with KOH in the presence of an oxidizing agent and dissolved in water, it gives a dark green solution of compound (Q). Compound (Q) disproportionates in neutral or acidic solution to give purple compound (R). An alkaline solution of compound (R) oxidizes potassium iodide solution to a compound (S) and compound (P) is also formed. Compounds P to S are:

Q. When

{X O}_{2}

is fused with an alkali metal hydroxide in presence of an oxidizing agent such as

K {N O}_{3}

; a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution.

X

is:

Q. Thermal decomposition of a

M n

compound (X) at

513 K

result in compound (Y),

M n O_{2}

and a gaseous product.

M n O_{2}

reacts with

N a C l

and concentrated

H_{2} S O_{4}

to give a pungent gas Z. X, Y and Z, respectively, are

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MnO2 when fused with KOH and oxidized in air gives a dark green compound X. In acidic X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and MnO2. The compounds X and Y. respectively, are

The correct option is A K2MnO4andKMnO42MnO2+4KOH+O2→2K2MnO4+2H2O3K2MnO4+4HCl→2KMnO4(Purple)+MnO2+4KCl+2H2O

$M n O_{2}$ when fused with KOH and oxidized in air gives a dark green compound X. In acidic X. In acidic solution, X undergoes disproportion to give an intense purple compound Y and $M n O_{2}$ . The compounds X and Y. respectively, are

The correct option is A $K_{2} M n O_{4} a n d K M n O_{4}$
$2 M n O_{2} + 4 K O H + O_{2} \to 2 K_{2} M n O_{4} + 2 H_{2} O$
$3 K_{2} M n O_{4} + 4 H C l \to 2 K M n O_{4} (P u r p l e) + M n O_{2} + 4 K C l + 2 H_{2} O$