Hydrogen Ion Concentration pH Scale and Buffer Solution MCQs

The concentration of hydrogen ions significantly influences bacterial growth and is usually measured in terms of pH, which is defined as the logarithm of the reciprocal of the hydrogen ion concentration. This means hydrogen ion concentration is often represented by pH. A buffer solution, which resists changes in pH even when a strong acid or base is added or when diluted with water, becomes highly effective when the concentration of the conjugate acid-base pair is high. The pH scale, ranging from 0 to 14, indicates the strengths of acids and bases, with 0 being the strongest acid and 14 being the strongest base. A universal indicator changes color at different pH values on this scale.

Range of pH scale is

(a) 7 to 10
(b) 0 to 10
(c) 0 to 14
(d) 7 to 14

When sulphuric acid reacts with eggshell it produces

(a) hydrogen gas
(b) nitrogen gas
(c) carbon monoxide
(d) carbon dioxide gas

The following salt is not hygroscopic in nature

(a) NaCl
(b) MgCl
(c) CaCl2
(d) KCl

Level of pH found in antacid solution

(a) ≤ 6.5
(b) ≥ 7.0
(c) > 10
(d) > 14

Ammonium sulphate salt is

(a) basic salt
(b) acidic salt
(c) neutral salt
(d) complex salt

In the Chlor-alkali process, the byproduct gases are

(a) hydrogen only
(b) hydrogen and oxygen gas
(c) hydrogen and chlorine gas
(d) chlorine and nitrogen gas

When acids react with metal oxide it produces

(a) water and salt
(b) salts and hydrogen gas
(c) salts only
(d) no reaction takes place

pH of neutral salt is

(a) 7
(b) <7

(c) >7
(d) 0

When more and more water is diluted with acids its H+ ion concentration will

(a) increase
(b) decrease
(c) remains the same
(d) depends on the type of acids

Three unknown solutions are given with pH value of 6, 8 & 9.5 respectively. Which solution will contain the maximum OH– ion?

(a) Solution sample-1
(b) Solution sample-2
(c) Solution sample-3
(d) Data are insufficient