Question

27) Which of the following process is a physical change?
(A) Iron is magnetized
(B) Iron rusts.
(C) Red hot iron is put in steam.
(D) All of these

28) The element capable of gaining as well as losing an electron is

(A) Hg
(B) Ca
(c) Ag
(d) H​

Answer 1

Answer:

Question 1> (D)

Question 2>(H)

Answer. Since it loses an electron to become chemically stable as it has an electron and it becomes H+ ion. Since only a proton is only left behind so it is also known as a proton. Since it gains an electron to become chemically stable as it has an electron and it becomes H- ion.