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Potassium manganate (K2MnO4) is formed w...

Potassium manganate `(K_2MnO_4)` is formed when

A

Cuprous oxide reacts with alkaline `KMnO_4` solution

B

Manganese dioxide is fused with `K_2CO_3` in presence of `KNO_3`

C

Formaldehyde reacts with potassium permanganate in presence of concentrated potassium hydroxide solution

D

Potassium permanganate is heated with potassium hydroxide

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The correct Answer is:
A,B,C,D
(A)`KMnO_4 +Cu_2O + KOH to 2Cu(OH)_2 + K_2MnO_4`
(B)`2MnO_2 + 2K_2CO_3 + O_2 ("from" KNO_3) to 2K_2MnO_4 + 2CO_2`
(C )`HCHO + 2KMnO_4 + 2K_2MnO_4 + H_2O +HCOOH`
(D)`4KMnO_4+4KOH oversetDeltato4K_2MnO_4 +2H_2O + O_2`
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Explain by giving suitable reason. (a). Yellow coloured aqueous solution of sodium chromate changes to orange-red when CO_2 under pressure is passed. (b). Green solution of potassium manganate, K_2MnO_4 , turns purple when CO_2 is circulated. (c). Hg^(2+) and Hg_2^(2+) salts are colourless. (d). Cu^(2+) salts are paramagnetic while Cu^(o+) salts are diamagnetic in nature.

Assertion : In titrations involving potassium permanganate no indicator is used. Reason : MnO_(4)^(-) acts as the self-indicator.

Write the balanced chemical equations for the following reactions: (i). A mixture of potassium dichromate and sodium chloride is heated with concentrated H_2SO_4 . (ii). Potassium peramanganate is added to a hot solution of manganous sulphate.

Write balanced chemical equations for: (i) Mixture of K_(2)Cr_(2)O_(7) and NaCl is heated with concentrated H_(2)SO_(4) . (ii) Potassium permanganate is added to a hot solution of manganous sulphate. (iii). Potassium dichromate and concentrated HCl are heated together.

Which of the following can be employed for the conversion of potassium manganate to potassium permanganate? C l 2 ; O 3 ; S O 2 ; K N O 3

Assertion (A) : Pink coloured solution of potassium permanganate turns green on passing O_3 through it. Reason (R) : K_2MnO_4 is oxidised by O_3 to KMnO_4 .

Comprehension # 1 Potash is any potassium mineral that is used for its potassium content. Most of the potash produced in the United States goes into fertilizer. The major sources of potash are potassium choride (KCI) and potassium sulphate (K_(2)SO_(4)) . Potash production is often reported as the potassium oxide (K_(2)O) equivalent or the amount of K_(2)O that could be made from a given mineral. KCl cost "Rs" 50 per kg What is the cost of K per mole of the KCl sample?

Comprehension # 1 Potash is any potassium mineral that is used for its potassium content. Most of the potash produced in the United States goes into fertilizer. The major sources of potash are potassium choride (KCI) and potassium sulphate (K_(2)SO_(4)) . Potash production is often reported as the potassium oxide (K_(2)O) equivalent or the amount of K_(2)O that could be made from a given mineral. KCI cost Rs 50 per kg For what price must K_(2)SO_(4) be sold in order to supply the same amount of potassium as in KCI ?

Which of the following can be employed for the conversion of potassium manganate to potassium permanganate?

Show with balanced equations what happens when the following are mixed. (i). Aqueous solution of potassium manganate and acid. (ii). Aqueous solution of potassium chromate and acid.

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