JEE MAIN - Chemistry (2024 - 31st January Evening Shift - No. 15)
Consider the following elements.
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Which of the following is/are true about $$\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}$$ and $$\mathrm{D}^{\prime}$$ ?
A. Order of atomic radii: $$\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$$
B. Order of metallic character: $$\mathrm{B}^{\prime}<\mathrm{A}^{\prime}<\mathrm{D}^{\prime}<\mathrm{C}^{\prime}$$
C. Size of the element: $$\mathrm{D}^{\prime}<\mathrm{C}^{\prime}<\mathrm{B}^{\prime}<\mathrm{A}^{\prime}$$
D. Order of ionic radii: $$\mathrm{B}^{\prime+}<\mathrm{A}^{1^{+}}<\mathrm{D}^{\prime+}<\mathrm{C}^{+}$$
Choose the correct answer from the options given below :
Explanation
In general along the period from left to right, size decreases and metallic character decrease.
In general down the group, size increases and metallic character increases.
$$\begin{aligned} & \mathrm{B}^{\prime}<\mathrm{A}^{\prime}(\text { size }) \quad \mathrm{C}^{\prime}>\mathrm{A}^{\prime}(\text { size }) \\ & \mathrm{D}^{\prime}<\mathrm{C}^{\prime}(\text { size }) \quad \mathrm{D}^{\prime}>\mathrm{B}^{\prime}(\text { size }) \\ & \mathrm{B}^{\prime}<\mathrm{A}^{\prime}(\text { metallic character }) \\ & \mathrm{D}^{\prime}<\mathrm{C}^{\prime}(\text { metallic character }) \\ & \mathrm{B}^{\prime+}<\mathrm{A}^{\prime+}(\text { size }) \\ & \mathrm{D}^{\prime+}<\mathrm{C}^{\prime+}(\text { size }) \\ & \therefore \text { C statement is incorrect. } \end{aligned}$$
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