Ion that gives colour to 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]

Compound 'A' in acidic medium does not give ppt with $H_{2}S$ but in $N{H}_{4}OH$ medium gives a ppt comp. 'A' is:

1. $FeC{l}_3$

2. $AlC{l}_3$

3. $ZnC{l}_2$

4. $SnC{l}_2$

\(FeCr_{2}O_{4} \) 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

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

An incorrect statement among the following is :

The general electronic configuration of lanthanoids is:

1. (n – 2) f ^1–14 (n – 1) s² p⁶ d^0–1 ns²

2. (n – 2) f ^10–14 (n – 1) d^0–1 ns²

3. (n – 2) f ^0–14 (n – 1) d¹⁰ ns²

4. (n – 2) d^0–1 (n – 1) f ^1–14 ns²

An element among the following that shows the maximum number of oxidation states is:

1. Cr

2. Fe

3. Mn

4. V