Four successive members of the first-row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy:

1. Vanadium (Z = 23)

2. Manganese (Z = 25)

3. Chromium (Z = 24)

4. Iron (Z = 26)

Colourless ion among the following is:

An element among the following that exhibits the maximum oxidation state is:

1. Cr

2. Mn

3. Fe

4. V

The main reason for a larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:
 

Ion that gives color with water is:

1. $C{u}^{+}$

2. $C{r}^{3+}$

3. $N{a}^{+}$

4. None of the above.

Maximum oxidation state is shown by:
1.  La
2.  Gd
3.  Eu
4.  Am

Which of the following is a coloured and paramagnetic compound?

1. CuF₂

2. K₂Cr₂O₇

3. $KMn{O}_4$

4. K₄[Fe(CN)₆]

Lanthanoids are:
 

Which of the following elements can combine with chlorine to form more than one binary compound?

1. Zn

2. K

3. Ca

4. Fe

\(FeCr_{2}O_{4} \) when reacts with $N{a}_{2}C{O}_3$ gives the product: 

1. $N{a}_{2}Cr{O}_4$

2. $N{a}_{2}C{r}_2{O}_7$

3. $F{e}_3{O}_4$

4. FeO