Give reason:
`Cu^(+1)` ion is diamagnetic.

Give reason: Cu^(2+) is paramagnetic and Cu^(+) is diamagnetic.

Give reason: Ti^(+4) ion is colourless.

Give reasons: i) Cu^(+2) (aq) is more stable than Cu^(+) ii) Ionisation enthalpy increases along transition elements from left to right iii) Zn has highest value for E^(@)(M^(3+)//M^(2+)) among 3d series elements

Give reason : SC^(3+) ions are colourless whereas V^(3+) ions are coloured.

Give reason - Genetic code is degenerate.

Which one of the following is diamagnetic ion?

(a) Give reasons for the following observations: (i) Cu^(+) ion is not stable in aqueous solution. (ii) Mn (II) ion shows maximum paramagnetic character amongst the bivalent ions of first transition series. (iii) Scandium (At. no. 21) salts are white. (b) Describe the reactions involved in the preparation of K_2Cr_2O_7 from chromite ore.