Multiple choice general knowledge science & technology

chromium(II) nitrate

  1. Cr(NO3)2

  2. CrNO3

  3. Cr3(NO3)2

  4. Cr(NO3)5
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A Correct answer
Explanation

Chromium(II) indicates Cr^2+ ion. Nitrate is NO3^- with a -1 charge. To balance the +2 charge of chromium, two nitrate ions are needed, giving the formula Cr(NO3)2. Parentheses are required around NO3 to show two complete nitrate groups.

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