Question

which of the following does not decolourise iodine a. Na2SO3b. Na2S2O3 c. NaCld. NaOH

Answer 1

The one which does not decolourize iodine solution is NaCl. Sodium Chloride is made up of sodium and Chlorine. All you need to know that both chlorine and iodine are both halogens. What you need to remember also the way the halogens react that is to say that you need to consider the reactivity of halogens.

Fluorine is the most reactive followed by chlorine, bromine the finally Iodine. Hence iodine cannot displace chlorine from its solution.

Answer 2

NaCl does not decolourise the iodine.

Option -C

Explanation:

• If we consider the reactivity of the different ion, high reactive ion can displace a lower reactive ion from its salt solution.
• Chlorine is more reactive as compared to Iodine. This is because the reactivity of the halogen decreases as we go down a group in the periodic table.
• Iodine cannot displace chlorine from sodium chloride because of this reason. Since in this reaction iodine remains unchanged, the colour of iodine also does not change.

To know more:

How can we decolourise a leaf ?What will you conclude when white patches do not turn blue black on adding iodine solution

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