Question

1. Assertion: Chemical reaction changes the physical and chemical state of a substance.
Reason: When electric current is passed through water (liquid), it decomposes to produce hydrogen and oxygen gases.
2. Assertion: In a balanced chemical equation, total mass of the each element towards reactant side= total mass of the same element towards product side.
Reason: Mass can neither be created nor destroyed during a chemical change.
3. Assertion: Convex mirror is preferred for rearview mirror in vehicles.
Reason: The field view of a convex mirror is lesser than that of concave mirror.
4. Assertion: An object appears to be black.
Reason: All the light falling on the object is absorbed and only black light is reflected from it.
5. Assertion: Lateral displacement is the distance between incident ray and the emergent ray.
Reason: The wider the glass slab, the larger the lateral displacement

Answer 1

Answer:

1) Both are correct but reason is not the correct explanation so answer Is (b)

2) b

3) assertion s true but reason is false as FOV for convex mirror is larger.

4) a

5) a