JEE Main 2016 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2016

Aqueous solution of which of the following salts will not contain ions with the electronic configuration ?

(1)NaFCorrect
(2)KBr
(3)NaCl
(4)

Answer: (1)

Solution

The configuration is that of 18 electrons — the argon core. The ions that have it are , , and . Check each salt: **KBr** supplies ✓; **NaCl** supplies ✓;

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Question ID VK-115614