Assertion (A) : In a displacement reaction an ion or an atom in a compound is replaced by an ion or an atom of another element : (x+y z y+x z ). Reason (R) : Displacement reactions fit into two catagories one is metal displacement other is non metal displacement. The correct one is :

Step-by-step solution

- Assertion (A): Correct. In a displacement reaction, an atom or ion in a compound is replaced by another atom or ion, as shown in the reaction (x+y z y+x z ). - Reason (R): Correct. Displacement reactions can be categorized into metal displacement (where a metal displaces another metal) and non-metal displacement (where a non-metal displaces another non-metal). Since the reason correctly explains the assertion, both are correct.