Question

which of following is a physical changes?
explain with reason.

(a) electrolysis of water gives hydrogen and oxygen.
(B) a bulb glows when electricity is passed through it.​

Answer 1

Answer:

answer is part b a bulb glows when .....

Answer 2

Answer:

electrolysis of water involve decomposition of water into oxygen and hydrogen gas and thus it can be converted back into its original state hence it is a chemical change

now a bulb glows when a electric current is passed and bulb glows and it can be converted back into its original state when the bulb was of when there was no current

HENCE B IS A PHYSICAL CHANGE

HOPE MY ANSWER HELPS YOU