QuestionJune 17, 2025

Which of the following formulas for a compound containing the Cr^3+ ion is incorrect? Cr(OH)_(3) Cr_(2)(SO_(4))_(3) OCrN CrNO_(3) CrCl_(3)

Which of the following formulas for a compound containing the Cr^3+ ion is incorrect? Cr(OH)_(3) Cr_(2)(SO_(4))_(3) OCrN CrNO_(3) CrCl_(3)
Which of the following formulas for a compound containing the Cr^3+ ion is incorrect? Cr(OH)_(3) Cr_(2)(SO_(4))_(3) OCrN CrNO_(3) CrCl_(3)

Solution
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Answer

OCrN Explanation 1. Determine the charge of each compound Cr^{3+} has a +3 charge. Match it with anions to ensure neutrality. 2. Check each formula for charge balance - **Cr(OH)_{3}**: Hydroxide (OH^{-}) has -1 charge. 3 hydroxides balance +3 from Cr^{3+}. - **Cr_{2}(SO_{4})_{3}**: Sulfate (SO_{4}^{2-}) has -2 charge. 3 sulfates balance 2 chromiums, each +3. - **OCrN**: Oxygen and nitrogen do not form stable compounds with chromium in this simple form. - **CrNO_{3}**: Nitrate (NO_{3}^{-}) has -1 charge. Only one nitrate does not balance +3 from Cr^{3+}. - **CrCl_{3}**: Chloride (Cl^{-}) has -1 charge. 3 chlorides balance +3 from Cr^{3+}.

Explanation

1. Determine the charge of each compound<br /> $Cr^{3+}$ has a +3 charge. Match it with anions to ensure neutrality.<br />2. Check each formula for charge balance<br /> <br />- **$Cr(OH)_{3}$**: Hydroxide ($OH^{-}$) has -1 charge. 3 hydroxides balance +3 from $Cr^{3+}$.<br />- **$Cr_{2}(SO_{4})_{3}$**: Sulfate ($SO_{4}^{2-}$) has -2 charge. 3 sulfates balance 2 chromiums, each +3.<br />- **OCrN**: Oxygen and nitrogen do not form stable compounds with chromium in this simple form.<br />- **$CrNO_{3}$**: Nitrate ($NO_{3}^{-}$) has -1 charge. Only one nitrate does not balance +3 from $Cr^{3+}$.<br />- **$CrCl_{3}$**: Chloride ($Cl^{-}$) has -1 charge. 3 chlorides balance +3 from $Cr^{3+}$.
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