H₂SO₄ (aq) Sulphuric Acid is the acid in the reaction.
What is an Acid ?
A substance that can donate a proton or accept an electron pair to form a bond is called an Acid
An acid turns Litmus paper red and has pH < 7 , It has the property of neutralizing alkali.
It has sour taste and can dissolve metals.
The reaction mentioned in the question is :
H₂SO₄ (aq) + Mg (s) ⇒ MgS0₄ (aq) + H₂ (g)
Here Sulphuric Acid is donating a proton i.e. H⁺ so is the acid in the reaction.
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