<span>Theoretically, a gas can never reach zero or a negative temp and always gives positive numbers
*Hope this helps
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Answer:A,D
Explanation:
Option a:
Sodium has charge 
Hydroxide has charge
.
So,sodium hydroxide is balanced.
Option b:
Magnesium has charge 
Two sulphates has a charge of
.
So,magnesium sulphate is not balanced.
Option c:
Magnesium has charge 
Two hydroxides have a charge of
.
So,magnesium hydroxide is balanced.
Option d:
Sodium has charge 
Sulphate has charge
.
So,sodium sulphate is not balanced.
D. there is one atom of sulfur and three atoms of oxygen
At the half equivalence point [HA] = [A-] and pH = pKa
<span>if Ka is 5.2e-5 then pKa = pH = 4.28</span>