Question

Which of the following is not a combination reaction / CaO(s)+H₂O(l) → Ca(OH)₂(aq)

C(s)+O₂(ɡ) → CO₂(ɡ)

2H₂(ɡ)+O₂(ɡ) → 2H₂O(l)

Zn(s) + CuSO₄(aq ) → ZnSO₄(aq) + Cu(s)

​

Answer 1

Answer:

Last one is not a combination reaction

Answer 2

Answer:

(d) Zn(s) + CuSO₄(aq ) → ZnSO₄(aq) + Cu(s)

Explanation:

Combination Reaction

A combination reaction is a reaction in which two or more substances combine to form one new substance. Combination reactions can also be called synthetic reactions.

The general form of the combined reaction is as follows:

A + B → AB

A combination reaction is the combination of two elements to form a single compound.

(d) Zn(s) + CuSO₄(aq ) → ZnSO₄(aq) + Cu(s)

This is not a combination reaction. This is an example of displacement reaction in which Zn (Zinc) replaces Cu (Copper) from its salt solution.

Displacement Reaction: A displacement reaction is defined as the one wherein the atom or a set of atoms is displaced by another atom in a molecule.

Therefore, option (d) is the correct option.

(a) CaO(s)+H₂O(l) → Ca(OH)₂(aq)

The reaction of quick lime (CaO) with water [H₂O] to form lime water [Ca(OH)₂] is an example of a combination reaction and the nature of the reaction is exothermic.

Therefore, option (a) is incorrect.

(b) C(s)+O₂(ɡ) → CO₂(ɡ)

It is a combination reaction because carbon combines with oxygen to form carbon dioxide.

Therefore, option (b) is incorrect.

(c) 2H₂(ɡ)+O₂(ɡ) → 2H₂O(l)

It is a combination reaction because hydrogen combines with oxygen to form water.

Therefore, option (c) is incorrect.

For more similar reference:

https://brainly.in/question/16697849

https://brainly.in/question/21170723

#SPJ3