Chemistry
The reaction:
BaCl2 (aq) + H2SO4 (aq) ⟶ BaSO4 (s) + 2HCl (aq) is
(i) displacement reaction
(ii) neutralisation reaction
(iii) decomposition reaction
(iv) double displacement reaction
Answer
Double displacement reaction
Reason — A chemical reaction in which both reactants [compounds] are decomposed to give two new compounds by exchanging their radicals is called a Double decomposition or double displacement reaction.
It is represented as XY + AB ⟶ XB + AY
In a displacement reaction, one element replaces another. In neutralisation acid reacts with base to form salt and water. Here, no water is formed. Decomposition involves one compound breaking into simpler substances.
Related Questions
Which of the following is not a characteristic of a chemical change?
(i) It is irreversible
(ii) No net energy change is involved
(iii) New substance is formed
(iv) Involves absorption or liberation of energy
A reaction of a type: AB + CD ⟶ AD + CB, involves
(i) no chemical change
(ii) decomposition of AB and CD
(iii) exchange of ions of AB and CD
(iv) combination of AB and CD
Thermal decomposition of sodium carbonate will produce
(i) carbon dioxide
(ii) oxygen
(iii) sodium hydroxide
(iv) no other product
Complete the following statements.
(a) The chemical change involving iron and hydrochloric acid illustrates a …………… reaction.
(b) In the type of reaction called …………… two compounds exchange their positive and negative radicals.
(c) A catalyst either …………… or …………… the rate of a chemical change but itself remains …………… at the end of the reaction.
(d) On heating, hydrated copper sulphate changes its colour from …………… to ……………