Assertion: Metals are good conductors of electricity. Reason: Electrical conductivity of metals is due to their
high density
a. Both A and R are true and R is the correct
explanation of A.
b. Both A and R are true but is not the
correct explanation of A.
O c. A is true but R is false.
O d. A is false but R is true.

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.