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When CO2 is passed into aqueous solution of CrO42−, CrO5 is formed

When CO2 is passed into MnO42− (green) solution it turns purple and a brown precipitate of MnO2 is formed.

The yellow colour of CrO42− due to d-d transition

The yellow colour of CrO42 is due to charge transfer.

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Correct (1) Cr2O72− is formed (fact). Function of CO2 to make solution acidic duc to formation of H2CO3. (4) It is due to charge transfer i.e., momentary transfer of charge from O-atom to metal atom (i.e., Cr) thereby changing O2- ion momentarily to O⊖ ion and reducing the O.S. of Cr from +6 to +5.

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Similar Questions

This section contains questions each with two columns-I and II. Match the items given in column I with that in column II.

	Column I		Column II
a.	Ni	p.	Elements having same number of unpaired electron in their dispositive in column I
b.	Na	q.	At least 13 electrons are having magnetic quantum number 'zero'
c.	Mn	r.	Atom is paramagnetic
d.	Pd	s.	Element is not transition element
		t.	Element having pseudo inert gas configuration in its dispositive cation