Which of the following is a single replacement reaction? ( a. ba(oh)2 + h2so4 → baso4 + 2h2o ( b. 2mg + o2 → 2mgo (c. h2o+ co2 → h2co3 (d. zn + h2so4 → znso4 + h2

The correct answer is option d, that is, Zn + H₂SO₄ → ZnSO₄ + H₂

A single displacement reaction refers to a kind of chemical reaction in which one element substitutes another element in a chemical reaction. The more reactive element will substitute the less reactive element. This is illustrated with the help of reactivity series, as the metal that is present above in the series will substitute the metal that is present below in the series readily. From the given equations, Zn + H₂SO₄ → ZnSO₄ + H₂ is a kind of single displacement reaction.  

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

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