If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?

A. Joule
B. Watt
C. Joule/Second
D. Both B. & C.

A. Higher than
B. Smaller than
C. Equal to
D. Either A. or B.; depends on the system

A. 0.5
B. 1
C. 3
D. 5

A. 10-11
B. 10-10
C. 10-3
D. 10-4

A. Fusion point
B. Spalling resistance
C. Slag penetration resistance
D. Refractoriness under load (RUL)

A. Neutrons and protons
B. Protons and electrons
C. Neutrons and electrons
D. Both A. & B.