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Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6
If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:
- a)a/2
- b)2a
- c)a
- d)a/3
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If...
Given reaction: Cu2 + I2 → 2CuI
The balanced equation shows that 1 mole of Cu2 reacts with 1 mole of I2 to produce 2 moles of CuI. Therefore, the number of moles of Cu2 consumed is equal to the number of moles of I2 consumed.
Let the number of moles of Cu2 consumed be a.
Now, consider the reaction between I2 and Na2S2O3: I2 + 2Na2S2O3 → 2NaI + Na2S4O6
From the balanced equation, we can see that 1 mole of I2 reacts with 2 moles of Na2S2O3 to produce 2 moles of NaI and 1 mole of Na2S4O6. Therefore, the number of moles of I2 consumed is equal to half the number of moles of Na2S4O6 produced.
Since the number of moles of Cu2 consumed is equal to the number of moles of I2 consumed, we can say that the number of moles of Cu2 consumed is also equal to half the number of moles of Na2S4O6 produced.
Equivalents of Na2S4O6 can be calculated as follows:
1 mole of Na2S4O6 contains 4 equivalents of S2O32- ions.
1 mole of Na2S4O6 reacts with 1 mole of I2, which contains 2 equivalents of I- ions.
Therefore, 1 mole of Na2S4O6 is equivalent to 8 equivalents of S2O32- ions or 4 equivalents of I- ions.
Since the number of moles of Na2S4O6 produced is a/2, the number of equivalents of Na2S4O6 produced is:
4 × (a/2) = 2a
Therefore, the equivalents of Na2S4O6 produced is 2a, which is option C.
The balanced equation shows that 1 mole of Cu2 reacts with 1 mole of I2 to produce 2 moles of CuI. Therefore, the number of moles of Cu2 consumed is equal to the number of moles of I2 consumed.
Let the number of moles of Cu2 consumed be a.
Now, consider the reaction between I2 and Na2S2O3: I2 + 2Na2S2O3 → 2NaI + Na2S4O6
From the balanced equation, we can see that 1 mole of I2 reacts with 2 moles of Na2S2O3 to produce 2 moles of NaI and 1 mole of Na2S4O6. Therefore, the number of moles of I2 consumed is equal to half the number of moles of Na2S4O6 produced.
Since the number of moles of Cu2 consumed is equal to the number of moles of I2 consumed, we can say that the number of moles of Cu2 consumed is also equal to half the number of moles of Na2S4O6 produced.
Equivalents of Na2S4O6 can be calculated as follows:
1 mole of Na2S4O6 contains 4 equivalents of S2O32- ions.
1 mole of Na2S4O6 reacts with 1 mole of I2, which contains 2 equivalents of I- ions.
Therefore, 1 mole of Na2S4O6 is equivalent to 8 equivalents of S2O32- ions or 4 equivalents of I- ions.
Since the number of moles of Na2S4O6 produced is a/2, the number of equivalents of Na2S4O6 produced is:
4 × (a/2) = 2a
Therefore, the equivalents of Na2S4O6 produced is 2a, which is option C.
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Community Answer
Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If...
According to this equation-
Neq(Cu2+) =Neq(I2) and also Neq(I2)= Neq(Na2S4O6)
But the n-factor for I2is same in both the reactions i.e 2.
Therefore, Neq(Cu2+)=Neq(Na2S4O6)= Neq(I2);
Now, nCu2+ �n-factor = Neq(Na2S4O6) .Moles of Cu2+given= a and its n-factor is 1;
Neq(Na2S4O6)= a �1 ;
Therefore, Neq(Na2S4O6)=a
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Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer? for Chemistry 2026 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer?.
Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer? for Chemistry 2026 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer?.
Solutions for Cu2+ + I– → Cu+ + I2, I2 + Na2S2O3 → NaI + Na2S4O6If the moles of Cu2+ in above reaction consumed is ‘a’ then equivalents of Na2S4O6 will be:a)a/2b)2ac)ad)a/3Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry. Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free.
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