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

1.	4.90 BM	2.	5.92 BM
3.	2.84 BM	4.	3.87 BM

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: 

An example of the effect of the concentration of nitric acid on the formation of oxidation products would be:

1. 3Cu + 8HNO_3(conc.)   →   3Cu(NO₃)₂   +   2NO   +   4H₂O

2. Cu   +   4HNO_{3 (conc.)}   →   Cu(NO₃)₂   +   2NO₂   +   2H₂O

3. Both (1), and (2)

4. None of the above

Match the following characteristics to the appropriate metal:  

Select the correct option :

Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵: Atomic number for the element X is :

1. 25

2. 26

3. 27

4. 24

Which compound exhibits colour in its solid state?

1. Ag₂SO₄

2. CuF₂

3. ZnF₂

4. Cu₂Cl₂

Among the following, which are amphoteric oxides?

1. V₂O₅, Cr₂O₃
2. Mn₂O₇, CrO₃
3. CrO, V₂O₅
4. V₂O₅, V₂O₄

The correct value of the spin-only magnetic moment of $C{r}^{3+}$ ion is equal to:

Which of the following statements is false?