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


NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations

Answer 1

(a) 2(HNO3) + Ca(OH)2 → Ca(NO3)2 + 2(H2O)

(b) 2(NaOH) + (H2SO4) → (Na2SO4) + 2(H2O)

(c) (NaCl) + (AgNO3) → (AgCl) + (NaNO3)
it is balanced.

(d) (BaCl2) + (H2SO4) → (BaSO4) + 2(HCl)

Answer 2

In a balanced chemical equation, the atoms must be balanced at both sides of the equation. We have to add the coefficients with the molecular formula of a compound. So, we need to check all atoms one by one and add coefficients with the molecular formula.

(a) $2 \mathrm{HNO}_{3}+\mathrm{Ca}(\mathrm{OH})_{2} \rightarrow \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{H}_{2} \mathrm{O}$

(b) $2 \mathrm{NaOH}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$

(c) $\mathrm{NaCl}+\mathrm{AgNO}_{3} \rightarrow \mathrm{AgCl}+\mathrm{NaNO}_{3}$

(d) $\mathrm{BaCl}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+2 \mathrm{HCl}$