JEE MAIN - Chemistry (2023 - 10th April Morning Shift - No. 1)
The compound which does not exist is
(NH$$_4$$)$$_2$$BeF$$_4$$
PbEt$$_4$$
BeH$$_2$$
NaO$$_2$$
Explanation
Sodium superoxide (NaO$_2$) is not a stable compound. It is not found in normal conditions due to its high reactivity.
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