Permanent hardness of water may be removed by the addition of
(A) sodium carbonate
(B) alum
(C) potassium permanganate
(D) lime
If the pH value of a substance is lower than 7, it would be considered as–
(A) Neutral
(B) Base
(C) Acid
(D) Ion
What is the mass number of an element, the atom of which contains two Protons, two neutrons and two electrons?
(A) 2
(B) 4
(C) 6
(D) 8
The air is the example of:
(A) The solution of solid in the gas
(B) The solution of gas in the gas
(C) The solution of liquid in the gas
(D) The solution of liquid in the solid
Percentage of lead in lead pencil is:
(A) zero
(B) 20
(C) 80
(D) 7
Get the Examsbook Prep App Today