Which of the formulae below is the correct chemical formula for copper (I) cyanide?Group of answer choices(a) CoCN(b) Co2CN(c) CuCN(d) CuCN2(e) Cu2CN
Question
Which of the formulae below is the correct chemical formula for copper (I) cyanide?
Group of answer choices
(a) CoCN
(b) Co2CN
(c) CuCN
(d) CuCN2
(e) Cu2CN
Solution
The correct chemical formula for copper (I) cyanide is (c) CuCN.
Here's why:
- Copper (I) indicates that copper has a charge of +1.
- Cyanide is a polyatomic ion with a charge of -1 (its formula is CN-).
- In a neutral compound, the total charges from the cation (positive ion) and anion (negative ion) must balance out to zero.
- Therefore, one +1 copper ion (Cu+) can balance out one -1 cyanide ion (CN-), giving us the formula CuCN.
So, the correct answer is (c) CuCN.
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