JEE MAIN - Chemistry (2025 - 3rd April Evening Shift - No. 6)
The correct orders among the following are
Atomic radius : $\mathrm{B}<\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$
Electronegativity : $\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}<\mathrm{B}$
Density : $\mathrm{Tl}<\mathrm{In}<\mathrm{Ga}<\mathrm{Al}<\mathrm{B}$
1st Ionisation Energy : $\mathrm{In}<\mathrm{Al}<\mathrm{Ga}<\mathrm{Tl}<\mathrm{B}$
Choose the correct answer from the options given below:
Explanation
| B | Al | Ga | In | Tl | |
|---|---|---|---|---|---|
| Atomic radius (pm) | 88 | 143 | 135 | 167 | 170 |
| Electronegativity | 2 | 1.5 | 1.6 | 1.7 | 1.8 |
| Density (g/cm$^3$) | 2.35 | 2.7 | 5.9 | 7.31 | 11.85 |
| Ionisation Energy (kJ/mol) | 801 | 577 | 579 | 558 | 589 |
$$\begin{array}{lc} \text { Radius Order } & \mathrm{T} \ell>\mathrm{In}>\mathrm{A} \ell>\mathrm{Ga}>\mathrm{B} \\ \text { EN Order } & \mathrm{B}>\mathrm{T} \ell>\mathrm{In}>\mathrm{Ga}>\mathrm{Al} \\ \text { Density Order } & \mathrm{T} \ell>\mathrm{In}>\mathrm{Ga}>\mathrm{A} \ell>\mathrm{B} \\ \mathrm{IE}_1 \text { Order } & \mathrm{B}>\mathrm{T} \ell>\mathrm{Ga}>\mathrm{A} \ell>\mathrm{In} \end{array}$$
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