Question

question 7
in this set of chemical reactions, which is a single replacement reaction?
a b) cuso4 (aq)+ bacl2 (aq) → baso4 (s) + cucl2 (aq)
b a) k2so4 (aq) + bacl2 (aq) → baso4 (s) + 2kcl (aq)
c c) zn (s) + h2so4 (aq) → znso4 (aq) + h2 (g)
d d) pb(no3)2 (aq) + 2nacl (aq) → pbcl2 (s) + 2nano3 (aq)

Explanation:

A single - replacement reaction has the general form A + BC → AC + B, where an element replaces another element in a compound. In option C, zinc (Zn) replaces hydrogen (H) in sulfuric acid (H₂SO₄) to form zinc sulfate (ZnSO₄) and hydrogen gas (H₂). Options A, B, and D are double - replacement reactions where the positive and negative ions of two ionic compounds exchange places.

Answer:

C. Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g)