The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution will be:

1. +2

2. +3

3. +4

4. +6

Which of the following is a result of the lanthanide contraction?

1. Zr and Y have nearly the same atomic radius.

2. Zr and Zn have the same oxidation state. 

3. Zr and Hf have nearly the same atomic radius.

4. Zr and Nb have similar oxidation states.

Actinoids show a greater number of oxidation states than lanthanoids because:  

Match the following characteristics to the appropriate metal:  

Select the correct option :

The calculated spin-only magnetic moment of Cr²⁺ ion is:

Urea reacts with water to form A, which decomposes to form B. When B is passed through ${\mathrm{Cu}}^{2+}$ (aq), a deep blue-colored solution C is formed

The formula of C is: 

1. ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$

2. $\mathrm{Cu}{\left(\mathrm{OH}\right)}_2$

3. ${\mathrm{CuCO}}_3.\mathrm{Cu}{\left(\mathrm{OH}\right)}_2$

4. ${\mathrm{CuSO}}_4$

The incorrect statement among the following is: 

What is produced when excessive diluted nitric acid is combined with potassium chromate?

1. Cr₂O₇^2- and H₂O  

2. Cr³⁺ and Cr₂O₇^2-  

3. CrO₄^2-  

4. Cr₂O₄^2-  

The magnetic moment of an Mn²⁺ ion is equal to:

Which of the following has the highest negative $\left(\raisebox{1ex}{${\mathrm{M}}^{2+}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{M}$}\right.\right)$ standard electrode potential ?

1. Ti

2. Cu

3. Mn

4. Zn