11. Some physical properties of five substances are shown. The letters are not element symbols.
(a) Which of these substances could be metals?
(1)
A N only
B L and M only
C M and N only
D L, M and N only
ANSWER
C M and N only
Analysis of Option/Explanation
For metals, it is mandatory that in solid state, it will definitely have good electrical conductivity. Hence, element M and N are metals. Therefore, option is the correct answer.
(b) Which substance has properties showing that it changes from a molecular structure to ions when it dissolves in water?
(1)
A L
B M
C P
D Q
ANSWER
D Q
Analysis of Option/Explanation
When in molecular structure it will not conduct electricity in solid and liquid state but when reacts with water then it will conduct electricity, i.e. having ions. Hence, option D is the correct answer highlighting element Q.
