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

Identify the incorrect statement.

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

In the standardization of $N{a}_2{S}_2{O}_3 u\sin g K_{2}C{r}_2{O}_7$ 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

Which of the following pairs of substances on reaction will not evolve gas?

1. Iron, and ${\mathrm{H}}_2{\mathrm{SO}}_4$ (aq)

2. Iron, and steam

3. Copper, and HCl(g)

4. Sodium, and ethyl alcohol

When $KMn{O}_4$ acts as an oxidising agent and ultimately forms $Mn{O}_4^{2-}, Mn{O}_2, M{n}_2{O}_3 and M{n}^{2+}$, then the number of electrons transferred in each case 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. $FeS{O}_4$

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

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