Which of the following molecule is covalent in nature?
Correct answer: C. AICl3
- A. NaCl
- B. MgCI3
- C. AICl3
- D. KCI
Explanation
The difference in electronegativity between aluminium (Al) and chlorine (Cl) is 3.16-1.61 = 1.55 which is lower than 1.7, hence, according to the Pauling scale, the bond formed between aluminium (Al) and a chlorine (Cl) atom is covalent, that makes, AlCl3 compound, covalent in nature.
This question appeared on the NUMS 2022 paper, which you can sit online with every answer explained.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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