The number of d-electrons in ${\mathrm{Fe}}^{2+}$ is not equal to
that of the

1.   p-electrons in Ne

2.   s-electrons in Mg

3.  d-electrons in Co⁺³

4.   p-electrons in ${\mathrm{Cl}}^{{}^{\mathrm{\_}}}$

Match the catalyst with the process:

Which of the following is the correct matching of Catalyst & Process?

1. (i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)

2. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)

3. (i)-(a), (ii)-(n), (iii)-(b), (iv)-(d)

4. (i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)

When neutral or faintly alkaline $KMn{O}_4$ is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:

1. $I_2$

2. $I{O}_4^{-}$

3. $I{O}_3^{-}$

4. $I{O}^{-}$

Which metal among the following has a lattice structure distinct from the others?

The correct order of E⁰(M²⁺/M) values with a negative sign for the four successive elements Cr, Mn, Fe and Co 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 lanthanoid elements is regarded as the hardest?

1. Lanthanum (La)
2. Lutetium (Lu)
3. Samarium (Sm)
4. Ytterbium (Yb)

The unpaired  electron in Eu³⁺ will be the same in: 

1. Yb²⁺

2. Ho³⁺

3. Sm²⁺

4. Gd³⁺

Primary component of Mischmetal that is commonly utilised in gas lighters is:

1. Cerium 
2. Iron
3. Samarium
4. Lanthanum

The correct statement is

1. Green vitriol and blue vitriol are isomorphus

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

Which is true about the ionic radius of M²⁺?

1. Ni²⁺<Cu²⁺<Zn²⁺

2. Ni²⁺>Cu²⁺>Zn²⁺

3. Cu²⁺<Ni²⁺<Zn²⁺

4. Zn²⁺<Ni²⁺<Cu²⁺