Match the following.
| Column I | Column II | ||
|---|---|---|---|
| A. | Photon | 1. | Value is 4 for N-shell |
| B. | Electron | 2. | Probability density |
| C. | $${\psi ^2}$$ | 3. | Always positive value |
| D. | Principle quantum number n | 4. | Exhibits both momentum and wavelength |
A. $\rightarrow(4)$
B. $\rightarrow$ (4)
C. $\rightarrow(2,3)$
D. $\rightarrow(1,3)$
A. Photon has particle nature as well as wave nature. It exhibits both momentum and wavelength.
B. Electron also has particle nature as well as wave nature. Thus, it also exhibits both momentum and wavelength.
C. $\psi^2$ represents probability density of electron and always has positive values.
D. Principal quantum number $n=4$ for $N$-shell.
$$\begin{array}{rrrr} & \mathrm{K} &\mathrm{L} & \mathrm{M} & \mathrm{N} \\ & n=\quad 1 & 2 & 3 & 4 \end{array}$$
It always has positive values.
Match species given in Column I with the electronic configuration given in Column II.
| Column | Column II | ||
|---|---|---|---|
| A. | Cr | 1. | $$ [\operatorname{Ar}] 3 d^8 4 s^0 $$ |
| B. | Fe$$^{2+}$$ | 2. | $$ [\operatorname{Ar}] 3 d^{10} 4 s^1 $$ |
| C. | Ni$$^{2+}$$ | 3. | $$ [\operatorname{Ar}] 3 d^6 4 s^0 $$ |
| D. | Cu | 4. | $$ [\operatorname{Ar}] 3 d^5 4 s^1 $$ |
| 5. | $$ [\operatorname{Ar}] 3 d^6 4 s^2 $$ |
A. $\rightarrow(4)$
B. $\rightarrow$ (3)
C. $\rightarrow(1)$
D. $\rightarrow(2)$
A. $\operatorname{Cr}(Z=24)=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5 4 s^1=[\operatorname{Ar}] 3 d^5 4 s^1$
B. $\mathrm{Fe}^{2+}(Z=26)=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^6 4 s^0=[\operatorname{Ar}] 3 d^6 4 s^0$
C. $\mathrm{Ni}^{2+}(Z=28)=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^8 4 s^0=[\mathrm{Ar}] 3 d^8 4 s^0$
D. $\mathrm{Cu}(Z=29)=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^1=[\mathrm{Ar}] 3 d^{10} 4 s^1$
Assertion (A) All isotopes of a given element show the same type of chemical behaviour.
Reason (R) The chemical properties of an atom are controlled by the number of electrons in the atom.
Assertion (A) Black body is an ideal body that emits and absorbs radiations of all frequencies.
Reason (R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously.
Reason (R) The path of an electron in an atom is clearly defined.