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Q.

How many of the following statements are true ?
(i)Chromate ion is square planar
(ii) Green manganate  ion is diamagnetic
(iii) Sodium dichromate can be prepared from sodium chromate.
(iv) Purple KMnO4 disproportionates in acidic medium and neutral  medium
(v) Ionic character of oxides decreases with increase in oxidation number of transition metal 
 

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

(iii) and (v) are correct
The green manganate ion is paramagnetic with one unpaired   but the permanganate is diamagnetic
Na2CrO4+H+→Na2Cr2O7+Na++H2O

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