Which of the following ions has the most unpaired electrons?

1.	Fe2+	2.	Fe3+
3.	Co3+	4.	Co2+

What is the correct electronic configuration of Ti (Z = 22 atoms)?

1. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^2$

2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}4p^6$

3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^4$

4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$

The metal having different lattice from those of others is

(1) Co

(2) Fe

(3) Ag

(4) Ni

The correct order of E⁰(M²⁺/M) values with negative sign is : 

(1) Mn > Fe > Co > Cr

(2) Mn > Cr > Fe > Co

(3) Fe > Mn > Cr > Co

(4) Co > Fe > Mn > Cr

Which of the following compound can be used as a purgative?

1. HgCl₂

2. ZnCl₂

3. Hg₂Cl₂

4. ZnSO₄.7H₂O

Choose the correct options (true or false) for the following statements respectively

(i) The colour of FeCl₂ depends upon the number of water of crystallization.

(ii) Anhydrous ZnCl₂ cannot be made by heating ZnCl₂.2H₂O

(iii) CuI₂ does not exist.

(1) TTF

(2) TFT

(3) TTT

(4) FFT

The unpaired electron in Eu³⁺ will bear similarities to that found in :

The element that has a maximum composition in Mischmetal and is used in the gas lighters is:

Select the correct statement(s) among the following

(1) CeS is used for making crucibles

(2) Hybridisation of Mn in KMnO₄ is sp³

(3) CO^2-₃ and HCO^-₃ ions can be distinguished by using AgNO₃

(4) All of these

The correct statement is

(1) Green vitriol and blue vitriol are isomorphous

(2) KMnO₄ and K₂Cr₂O₇ are coloured due to d-d transitions

(3) Cu₂Cl₂ and Ag₂S are coloured

(4) Upon strong heating paramagnetic gases are evolved by CuSO₄ and AgNO₃