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Select the correct statement (s)....

Select the correct statement `(s)`.

A

`EN` of `Ga` and `Ge gt EN` of `Al` and `Si`, due to `d`- block contraction.

B

`EN` of `Ga` and `Ge lt EN` of `Al` and `Si`, due to `d`-block contraction.

C

`EN` of `Pb gt EN` of `TI` and `Bi`, due to `d`-block contraction

D

`EN` of `Pb lt EN` of `TI` and `Bi`, due to `d`-block contraction

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each of the given statements regarding electronegativity and the effects of d-block and f-block contraction. ### Step-by-Step Solution: 1. **Understanding Electronegativity**: - Electronegativity is the tendency of an atom to attract electrons in a chemical bond. It generally decreases down a group in the periodic table. 2. **Analyzing Option A**: - The statement claims that the electronegativity of gallium (Ga) and germanium (Ge) is greater than that of aluminum (Al) and silicon (Si) due to d-block contraction. - Gallium and germanium do have higher electronegativities compared to aluminum and silicon, primarily due to poor shielding of d-electrons. This makes the nucleus more effective in attracting bonding electrons. 3. **Analyzing Option B**: - This option states that the electronegativity of gallium and germanium is less than that of aluminum and silicon due to d-block contraction. - This statement is incorrect because we established that Ga and Ge have higher electronegativities. 4. **Analyzing Option C**: - This option claims that the electronegativity of lead (Pb) is greater than that of thallium (Tl) and bismuth (Bi) due to d-block contraction. - While lead does have a higher electronegativity than thallium, the reasoning provided is not entirely accurate. The effect of f-block contraction (poor shielding of f-electrons) is more relevant in this context. 5. **Analyzing Option D**: - This option states that the electronegativity of lead is less than that of thallium and bismuth due to d-block contraction. - This is incorrect because lead's electronegativity is indeed greater than that of thallium and bismuth. 6. **Conclusion**: - The only correct statement is Option A: "Electronegativity of gallium and germanium is greater than electronegativity of aluminium and silicon due to poor shielding of d electrons." ### Final Answer: The correct option is **A**. ---
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