1 . MgOH2

• A. $2.0\times {10}^{-3}$
• B. $2.0\times {10}^{-19}$
• C. $2.0\times {10}^{-2}$
• D. $2.0\times {10}^{-7}$

Answer: Option A

Explanation:

2 . MgOH2

• A. $1\times {10}^{-4}$
• B. $2\times {10}^{-3}$
• C. $1\times {10}^{-3}$
• D. $2\times {10}^{-4}$

Answer: Option A

Explanation: