### Chapter 1: Chemical reactions and equations

Q
##### Chemical reactions and equations

Question:

Balance the following chemical equations:

(a) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O

(b) NaOH + H2SO4 → Na2SO4 + H2O

(c) NaCl + AgNO3 → AgCl + NaNO3

(d) BaCl2 + H2SO4 → BaSO4 + HCl

(a)- The number of atoms of different elements present in the given unbalanced equation is as follows: First balance hydrogen by multiply 2 in the reactant side and 2 in the product side as shown below:

2 HNO3 + Ca(OH)2 → Ca(NO3)2 + 2 H2O

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is 2 HNO+ Ca(OH)→ Ca(NO3)+ 2H2O.

(b)- The number of atoms of different elements present in the given unbalanced equation is as follows: First balance sodium by multiply 2 in the reactant side as shown below:

2 NaOH + H2SO4 → Na2SO4 + H2O

Now, balance hydrogen by multiply 2 in the product side as shown below:

2 NaOH + H2SO4 → Na2SO4 + 2 H2O

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is 2NaOH + H2SO4→Na2SO+ 2H2O.

(c)- The number of atoms of different elements present in the given unbalanced equation is as follows: The number of atoms of each element is the same in reactant as in the product.

Therefore, the correct answer is NaCl + AgNO→ AgCl + NaNO3.

(d)- The number of atoms of different elements present in the given unbalanced equation is as follows: First, balance hydrogen by multiply 2 in the product side as shown below:

BaCl2 + H2SO4 → BaSO4 + 2 HCl

The number of atoms of different elements present in the given balanced equation is as follows: Therefore, the correct answer is BaCl+ H2SO→ BaSO+ 2HCl.

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