Question

Q. Complete the following equation with balancing :
(a) Al + HCI-
(b) Mg + HNO3-

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Answer 1

Explanation:

2Al + 6HCl -> 2 AlCl3 + 3H2

Mg + 2HNO3 -> Mg(NO3)2 + H2

Answer 2

The answers are :

(a) 2Al + 6HCl  → 2AlCl₃ + 3H₂

(b) Mg + 2HNO₃  → Mg(NO₃)₂ + H₂

• (a) 2Al + 6HCl  → 2AlCl₃ + 3H₂ and (b) Mg + 2HNO₃  → Mg(NO₃)₂ + H₂ are  single displacement type of reactions.
• Single displacement reactions occur when one element in a compound is simply replaced by another element that has not been combined.

•                                    A + BC → AC + B

• Understanding the patterns of reactivity of components of the same kind can be studied with the use of single displacement reactions.
• Table salt (Sodium chloride) is one of the products of a single displacement that we use daily.

• Sodium chloride and calcium are the byproducts of the reaction between calcium chloride and sodium.

• Some other examples are  

                            2HCl(aq) + Zn(s) → ZnCl₂(aq) + H₂(g)

                             CaF₂(s) + Br₂(l) → CaBr₂(s) + F₂(g)

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