Electronic Configuration

Q. Which one of following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

1. $2Mn{O}_4^{-}+3H_2{O}_2\to 2Mn{O}_2+3O_2+2H_{2}O+2O{H}^{-}$
2. $PbS+4H_2{O}_2\to PbS{O}_4+4H_{2}O$
3. $HOCl+H_2{O}_2\to H_3{O}^{+}+C{l}^{-}+O_2$
4. $M{n}^{2+}+H_2{O}_2\to M{n}^{4+}+2O{H}^{-}$

Q. A substance which participates readily in both acid-base and oxidation-reduction reactions is:

1. $N{a}_{2}C{O}_3$
2. $KOH$
3. $KMn{O}_4$
4. $H_2{C}_2{O}_4$

Q. What is the increasing order of equivalent weights of the following oxidising agents?
(i) $KMn{O}_4⟶M{n}^{2+}$
(ii) $K_{2}C{r}_2{O}_7⟶C{r}^{3+}$
(iii) $KCl{O}_3⟶C{l}^{-}$
[Atomic wt.:
$K=39,Cr=52,Mn=55,Cl=35.5,O=16$]

1. $KCl{O}_3<KMn{O}_4<K_{2}C{r}_2{O}_7$
2. $K_{2}C{r}_2{O}_7<KMn{O}_4<KCl{O}_3$
3. $KMn{O}_4<K_{2}C{r}_2{O}_7<KCl{O}_3$
4. $KCl{O}_3<K_{2}C{r}_2{O}_7<KMn{O}_4$

Q. Why does the oxidation number of transition metals changes by unity wheras of p block elements changes by a unit of 2 ?😄

Q.

zIllustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on lectronic configuration.

Q.

The general electronic configuration of halogens is?

1. ns²np³

2. ns²np⁵

3. ns²np⁶

4. ns²

Q.

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [CBSE AIPMT 2009]

1. $3d^3,4s^2$

2. $3d^5,4s^1$

3. $3d^2,4s^2$

4. $3d^5,4s^2$

Q.

For ${}_{24}Cr$, which of the following statements is/are correct:

1. Number of electrons with principle quantum number 3 is 13

2. Number of electrons with azimuthal quantum number 1 is 12

3. Number of electrons with magnetic quantum number 0 is 12

4. Number of minimum or maximum electrons with spin quantum number $+\frac{1}{2}$ is 9 or 15

Q.

Which of the following has the maximum number of unpaired electrons?

1. $V^{3+}$
   

2. $M{g}^{2+}$
   

3. $T{i}^{3+}$
   

4. $F{e}^{2+}$

Q.

Which has most stable +2 oxidation state?

1. Sn

2. Pb

3. Fe

4. Ag