1.
Range of pH scale is
A. 7 to 10
B. 0 to 10
C. 0 to 14
D. 7 to 14
Answer: (C)
The pH scale spans from 0 (very acidic) to 14 (extremely basic)
(highly alkaline). A neutral solution has a pH value of seven. On
the pH scale, an acidic solution is indicated by a number less than 7.
While a basic solution is represented by a pH value more than 7, an acidic
solution is represented by a number less than 7.
2. Level of pH found in antacid solution
A. ≤ 6.5
B. ≥ 7.0
C. > 10
D. > 14
Answer: (B)
Antacids are weak bases that work by neutralising the acid produced
by the stomach. Raising the pH of the stomach contents has the effect of
suppressing the action of pepsin, which exacerbates ulcers caused by acid
reflux disease. Antacids are efficient at relieving stomach discomfort
because, when they react with acids, they produce a pH that is close to
neutral. The pH value of stomach acid is 1, while the pH value of an
antacid tablet is 10. As a result of mixing them together, the pH is
closer to 7, which is considered neutral.
3. 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
Answer: (C)
Bases have a proclivity to release the OH ion, and bases have a pH
greater than 7 compared to acids. As the pH of the solution rises, the
likelihood of the release of OH ion rises as well. The pH of a particular
solution is determined by the amount of ion present in the solution at any
given time. It is the pH of a solution that determines whether the solution
is acidic or basic. If the pH of a solution is more than 7, the solution is
considered basic. If the pH of a solution is less than 7, the solution is
acidic, and if the pH of a solution is greater than 7, the solution is neutral.
4. pH of neutral salt is
A. 7
B. <7
C. >7
D. 0
Answer: (A)
All ph values below neutral are considered acidic, whilst all ph levels over
7.0 are considered alkaline. These ions do not interact with either the
hydrogen or the hydroxide ions in the environment. The pH of salt is
usually around seven. Normally, salts formed by strong acids and strong
bases do not hydrolyze; hence, no reaction occurs between the ions and
water, and the solution remains neutral with a pH of seven.
5. Ammonium sulphate salt is
A. basic salt
B. acidic salt
C. neutral salt
D. complex salt
Answer: (A)
The reaction between the sulphuric acid and the ammonium hydroxide
results in the formation of ammonium sulphate. Acidity is high in
sulphuric acid, but baseness is low in ammonium hydroxide. As a result,
the acidity of the salt generated by ammonium sulphate is high. It is a
salt that, when dissolved in a solution, will generate a basic solution of
the same name. It is possible to produce basic salts by neutralising strong
bases with weak acids. Ammonium sulphate is a salt formed by the
reaction of a strong acid and a weak base, and as such it is an acidic salt.
6. When sulphuric acid reacts with eggshell it produces
A. hydrogen gas
B. nitrogen gas
C. carbon monoxide
D. carbon dioxide gas
Answer: (D)
Eggshell interacts with sulphuric acid, resulting in the formation of
calcium oxide and the release of carbon dioxide gas as byproducts.
Sulphuric acid reacts with eggshell calcium carbonate, which is abundant
in eggshells. Calcium carbonate is the main component of the eggshell.
When nitric acid is introduced to eggshells, it causes the creation of
calcium nitrate and carbon dioxide gas, which is harmful to the
environment. Calcium Nitrate + Carbon Dioxide + Water = Eggshell +
Nitric Acid + Carbon Dioxide + Water.
7. 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
Answer: (C)
Chlor-alkali is an industrial process that is widely used to produce
chlorine, caustic soda, and other chlorine-and-sodium-derived/based
products such as sodium hypochlorite, hydrochloric acid, chlorosulphonic
acid, bleaching powder, polyaluminum chloride (plastic aluminium
chloride), hydrogen gas (gaseous hydrogen), and chlorinated paraffin.
Bleaching powder is a bleaching agent that is commonly used in the
chemical industry. As a result, chlorine gas is produced as a by-product
of the chlor-alkali process, which is employed in the production of
bleaching powder.
8. The following salt is not hygroscopic in nature
A. NaCl
B. MgCl
C. CaCl2
D. KCl
Answer: (A)
In nature, none of the salts are hygroscopic at all. The pure form of
sodium salt, sodium chloride, is incapable of absorbing water from only
the surrounding atmosphere of wet air. When there is little humidity,
NaCl does not alter.
9. 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
Answer: (B)
10. 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
Answer: (A)
