Which of these statements is not true?

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(C) $(a) \ NO^{+} = 7+8-1 = 14 \ e^-$. $O_2 = 16 \ e^-$. Thus,they are not isoelectronic. This statement is false.$(b)$ Boron forms only covalent comp

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In aqueous solution,the $Ti^{+}$ ion is much more stable than $Ti(III)$

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(C) $(a) \ NO^{+} = 7+8-1 = 14 \ e^-$. $O_2 = 16 \ e^-$. Thus,they are not isoelectronic. This statement is false.$(b)$ Boron forms only covalent compounds due to its extremely high ionization energy. This statement is true.$(c)$ In aqueous solution,$Ti^{3+}$ is more stable than $Ti^{+}$. This statement is false.$(d) \ LiAlH_4$ is a well-known versatile reducing agent in organic synthesis. This statement is true.Note: The question asks for the statement that is not true. Both $(a)$ and $(c)$ are technically false,but $(c)$ is a more standard textbook error regarding stability in aqueous media.

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