Question

Which of the following reactions is/are a double displacement reaction(s) ?
(i) $AgN{O}_3+NaBr\to NaN{O}_3+AgBr$
(ii) $BaC{l}_2+H_{2}S{O}_4\to BaS{O}_4+2HCl$
(iii) $AgN{O}_3+NaCl\to AgCl+NaN{O}_3$
(iv) $NaOH+HCl\to NaCl+H_{2}O$

• A. (i) and (ii)
• B. Only (iii)
• C. Only (iv)
• D. (i) to (iv) all

Answer 1

The correct option is D (i) to (iv) all

Double displacement reaction is the type of reaction in which two compounds react to form a completely new set of compounds by displacement of strong metal by weak metal. In the given examples all strong metals like sodium, barium replaces other metals/ non-metals to form different compounds. Hence, all of the equations are double displacement reactions.