Identify the incorrect statement.

1.	The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
2.	Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
3.	The oxidation states of chromium in  CrO42– and Cr2O72– are not the same.
4.	Cr2+(d4)  is a stronger reducing agent than  Fe2+(d6)  in water.

Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue colour solution C is formed. What is the formula of C from the following?

In the standardization of $N{a}_2{S}_2{O}_3<mspace\; width="1em"></mspace>u\sin g<mspace\; width="1em"></mspace>K_{2}C{r}_2{O}_7$ by iodometry, the equivalent weight of $K_{2}C{r}_2{O}_7$ is:

(1) (Molecular weight)/2

(2) (Molecular weight)/6

(3) (Molecular weight)/3

(4) same as molecular weight

The number of moles of Mohr's salt required per mole of dichromate ion is:

1. 3

2. 4

3. 5

4. 6

The number of electrons transferred during the reduction of \(\mathrm{KMnO}_4 \text { to } \mathrm{MnO}_4^{2-},\) \(\mathrm{MnO}_2, \mathrm{Mn}_2 \mathrm{O}_3 \text {, and } \mathrm{Mn}^{2+}\) respectively, is:

1. 4,3,1,5

2. 1,5,3,7

3. 1,3,4,5

4. 3,5,7,1

Which one of the compounds does not decolorized an acidified solution of $KMn{O}_4$?

1. $S{O}_2$

2. $FeC{l}_3$

3. $H_2{O}_2$

4. $FeS{O}_4$

Among the properties (a) reducing, (b) oxidising and (c) complexing the set of properties shown by $C{N}^{-}$ ion towards metal species is:

(1) a,b,c

(2) b,c

(3) c,a

(4) a,b

Which of the following ions has the most unpaired electrons?

 Given lanthanoid ions ,the tendency to form the complexes is highest for:

1. Ce⁺³

2. Pm⁺²

3. Lu⁺³

4. Eu⁺²

Choose the correct statement regarding bonding in FeCl₃ at high temperature.

(I) It contains a 2c-2e- bond.

(II) It contains a 3c-2e- bond.

(III) It contains a coordinate bond.

1. (I), (II)

2. (I), (III)

3. (II), (III)

4. (I), (II) & (III)