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The oxidation state of chromium in the final product formed by the reaction between Kl and acidified potassium dichromate solution is:
  • a)
    + 3
  • b)
    + 2
  • c)
    + 6
  • d)
    + 4
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The oxidation state of chromium in the final product formed by the rea...
oxidation state of Cr is 3+.
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The oxidation state of chromium in the final product formed by the rea...
Explanation:

When potassium dichromate (K2Cr2O7) is reacted with Kl (potassium iodide) in the presence of acid, the redox reaction takes place. In this reaction, the oxidation state of chromium changes, and we need to determine the final oxidation state of chromium.

The balanced equation for the reaction is as follows:

K2Cr2O7 + 14HCl + 6Kl → 2CrCl3 + 14KCl + 7H2O + 3I2

Step 1: Assigning oxidation states
To determine the oxidation state of chromium in the final product, we first assign oxidation states to the elements in the reactants and products.

In K2Cr2O7, the oxidation state of oxygen is -2 and the overall charge of the compound is 0. Since potassium is in Group 1, its oxidation state is +1. Therefore, we can calculate the oxidation state of chromium using the following equation:

2(+1) + 2x + 7(-2) = 0

Simplifying this equation, we get:

2 + 2x - 14 = 0
2x - 12 = 0
2x = 12
x = 6

Therefore, the oxidation state of chromium in K2Cr2O7 is +6.

Step 2: Analyzing the reaction
In the reaction, K2Cr2O7 is reduced to CrCl3. Reduction involves a decrease in oxidation state. Since the oxidation state of chromium in K2Cr2O7 is +6, and in CrCl3 it is +3, the oxidation state of chromium has decreased by 3.

Step 3: Determining the final oxidation state
Since the oxidation state of chromium in CrCl3 is +3, it is the final oxidation state of chromium in the reaction.

Therefore, the correct answer is option A: 3.
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The oxidation state of chromium in the final product formed by the reaction between Kl and acidified potassium dichromate solution is:a)+ 3b)+ 2c)+ 6d)+ 4Correct answer is option 'A'. Can you explain this answer?
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