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Question

The reaction of potassium permanganate (VII) with acidified iron(II) sulphate is given below:

If 15.8 g of potassium permanganate(VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction. (K = 39, Mn = 55, Fe = 56, S = 32, O = 16)


A

46 g

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B

54 g

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C

62 g

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D

76 g

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E

82 g

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Solution

The correct option is D

76 g



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Q. Paragraph for below question

नीचे दिए गए प्रश्न के लिए अनुच्छेद

11.85 g KMnO4 is dissolved in one litre of dil. H2SO4. To this solution, sufficient SO2 gas is passed just to decolourise the purple colour of KMnO4 solution.

2KMnO4 + 5SO2 + 2H2O → K2SO4 + 2MnSO4 + 2H2SO4

The SO2 gas used in the above reaction is produced by oxidation of iron pyrites (FeS2) as per the following reaction

4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

11.85 g KMnO4 को एक लीटर तनु H2SO4 में घोला गया है। इस विलयन में, KMnO4 विलयन के बैंगनी रंग को विरंजित करने के लिए पर्याप्त SO2 गैस प्रवाहित की जाती है।

2KMnO4 + 5SO2 + 2H2O → K2SO4 + 2MnSO4 + 2H2SO4

उपरोक्त अभिक्रिया में प्रयुक्त SO2 गैस को निम्नलिखित अभिक्रिया के अनुसार आयरन पाइराइट (FeS2) के ऑक्सीकरण द्वारा प्राप्त किया जाता है।

4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

Q. What is the minimum mass of iron pyrites required in the above reaction?

[Atomic mass in u : O = 16, S = 32, K = 39, Mn = 55, Fe = 56]

प्रश्न - उपरोक्त अभिक्रिया में आवश्यक आयरन पाइराइट का न्यूनतम द्रव्यमान क्या है?

[u में परमाणु द्रव्यमान : O = 16, S = 32, K = 39, Mn = 55, Fe = 56]

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