Question

2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O; is an example of
(i) displacement reaction
(ii) double displacement reaction
(iii) neutralisation reaction
(iv) combination reaction.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Answer 1

Explanation:

) (ii) and (iii)

Explanation:

(ii) because displacement occurs in both molecules

and (iii) because HN\begin{gathered}O_{3} \\\end{gathered}

O

3

(acid) is neutralised by Ca(OH)2 (base)

Answer 2

2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O; is an example of options (b) (ii) and (iii).

• In displacement reaction displacement of one of the reactant occur and a new product is formed.
• Examples of displacement reactions are Fe2O3+3CO→2Fe+3CO 2. In this reaction, oxygen is displaced from Fe2O3 but not displacement from CO.
• In a double displacement reaction, displacement of both the reacting molecules occurs. for example- CuSO4+ 2NaOH → Cu(OH)2 + Na2SO4. in this reaction Cu is displaced from CuSO4 and Na from NaOH. as displacement is occurring in both the reactants.
• A neutralisation reaction is a simple acid-base reaction and salt and water are produced.
• In combination reaction product is formed by the combination of two or more reactants.
• So, 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O is an example of both double displacement and neutralisation reactions. In this reaction acid HNO3 reacted with base Ca(OH)2 and displacement of Hydrogen and calcium occurred.