Answer:A,D
Step-by-step explanation:
Option a:
Sodium has charge
![+1](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ppnhdqy8t0jwt1jgvwq7jr1av3a2fmwtwi.png)
Hydroxide has charge
.
So,sodium hydroxide is balanced.
Option b:
Magnesium has charge
![+2](https://img.qammunity.org/2020/formulas/chemistry/college/dhmovngb5xr4f06v6ybwol1en50wdink31.png)
Two sulphates has a charge of
.
So,magnesium sulphate is not balanced.
Option c:
Magnesium has charge
![+2](https://img.qammunity.org/2020/formulas/chemistry/college/dhmovngb5xr4f06v6ybwol1en50wdink31.png)
Two hydroxides have a charge of
.
So,magnesium hydroxide is balanced.
Option d:
Sodium has charge
![+1](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ppnhdqy8t0jwt1jgvwq7jr1av3a2fmwtwi.png)
Sulphate has charge
.
So,sodium sulphate is not balanced.