Question

question 7 (1 point)
listen
the correct formulas for manganese(ii)hydroxide and copper(ii)nitrate are:

1. mgo and con
2. mg(oh) and cono₃
3. mn(oh)₂ and cu(no₃)₂
4. mnoh and cuno₃

Explanation:

Step1: Analyze Manganese(II) Hydroxide

Manganese(II) has a charge of \(+2\) (\(Mn^{2+}\)), and hydroxide is \(OH^-\) (charge \(-1\)). To balance charges, we need 2 \(OH^-\) for 1 \(Mn^{2+}\), so the formula is \(Mn(OH)_2\).

Step2: Analyze Copper(II) Nitrate

Copper(II) has a charge of \(+2\) (\(Cu^{2+}\)), and nitrate is \(NO_3^-\) (charge \(-1\)). To balance charges, we need 2 \(NO_3^-\) for 1 \(Cu^{2+}\), so the formula is \(Cu(NO_3)_2\).

Step3: Match with Options

Check each option:

• Option 1: Formulas use Mg and Co (wrong elements), eliminate.
• Option 2: Wrong elements (Mg, Co) and incorrect hydroxide/nitrate formulas, eliminate.
• Option 3: \(Mn(OH)_2\) (manganese(II) hydroxide) and \(Cu(NO_3)_2\) (copper(II) nitrate) match our derived formulas.
• Option 4: Incorrect formulas (MnOH, CuNO₃) due to charge imbalance, eliminate.

Answer:

1. \(Mn(OH)_2\) and \(Cu(NO_3)_2\)