Which of the following pairs lists a substance that can neutralize h2so4 and the salt that would be produced from the reaction?

caoh2 and ca(so4)2
lioh and li2so4
nh4 and nh4so4
nh3 and (nh3)2so4

The second option only.

A base neutralizes an acid when the two reacts to produce water and a salt.

Sulfuric acid H₂SO₄ is the acid here. There are more than one classes of bases that can neutralize H₂SO₄. Among the options, there are:

Metal hydroxides

Metal hydroxides react with sulfuric acid to produce water and the sulfate salt of the metal.

.

The formula for calcium sulfate in option A is spelled incorrectly. Why? The charge on each calcium is +2. The charge on each sulfate ion is -2. Unlike ions, it takes only one ion to balance the charge on each ion. As a result, and ions in calcium sulfate exist on a 1:1 ratio.

.

Ammonia, NH₃

Ammonia NH₃ can also act as a base and neutralize acids. NH₃ exists as NH₄OH in water:

.

The ion acts like a metal cation. Similarly to the metal hydroxides, NH₃ (or NH₄OH) neutralizes H₂SO₄ to produce water and a salt:

.

The formula of the salt (NH₄)₂SO₄ in the fourth option spelled the ammonium ion incorrectly.

As part of the salt (NH₄)₂SO₄, the ammonium ion NH₄⁺ is one of the products of this reaction and can't neutralize H₂SO₄ any further.

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