State whether the following are physical or chemical changes.
(a) glowing of a bulb

Q. State whether the following are physical or chemical changes.
(j) lightning

Q. State whether the following are physical or chemical changes.
(q) Melting of wax

Q. State whether the following are physical or chemical changes.
(p) Digestion of food

Q. State whether the following are physical or chemical changes.
(r) Boiling of an egg

Q. State whether the following are physical or chemical changes.
(f) passing electric current through a heater’s rod