Acids and bases MCQ-B.Sc. Second year (UG degree course) Semester Fourth, Inorganic chemistry paper-X

B.Sc. Second year Undergraduate degree course Semester Fourth Inorganic chemistry paper X

Chapter- Acids and bases MCQ

Multiple Choice questions:

1. as per Arrhenius Concept, Weak Acid among These is___?

a) HCL

b) HNO₃

c) HCN

d) H₂SO₄

2. Which of These is not an Acid, Despite being a Hydrogen Compound?

a) CH₄

b) CCl₃COOH

c) H₂S

d) HF

3 As per the Bronsted and Lowry Concept, a Base is a Substance that___

a) Accepts proton

b) Donates proton

c) Accepts neutron

d) Donates neutron

4. Which of the following species can act as Lewis Base?

a)      Negatively charged species or Anions and Neutral Species with one lone pair of electrons
b)      Positively charged species or Cations and Neutral Species with one lone pair of electrons
c)      Molecules in which the central atom has incomplete octet
d)     Simple cations

5. Which of the Following Phenomena will occur when a Small Amount of Acid is added to Water?

a) dilution

b) neutralization

c) salt formation

d) ionization

6. As per Lewis Concept, a Molecule in Which the Central Atom has an Incomplete Octet is___?

a) Base

b) Acid

c) Alkali

d) A neutral solvent

7. Which one is correctly matched?
a) Acids – pH range above7
b) Acids – pH range below 7
c) Acids – pH range 7(neutral)
d) Acids – pH range 8-9

8. Which of the following is neither an acid nor base?
a) CH₃COOH
b) HCl
c) KCl
d) CH₃OH

9. Which one will change from red litmus to blue?
a) NaCl
b) HCl
c) KOH
d) LiOH

10. An electron-pair acceptor is a

a) Brønsted-Lowry base.
b)      Lewis base.
c)      Lewis acid.
d)     traditional acid.

11. Whose definition of acids and bases emphasizes the role of protons?

a) Brønsted and Lowry

b) Arrhenius

c) Lewis

d) Faraday

12. Which statement about Arrhenius acids is FALSE?

a)      Their water solutions are called aqueous acids.
b)      They are molecular compounds with ionizable hydrogen atoms.
c)      Their pure aqueous solutions are electrolytes.
d)     They increase the concentration of hydroxide ions in aqueous solution.

13. Bases react with

a)      acids to produce salts and water.
b)      water to produce acids and salts.
c)      salts to produce acids and water.
d)     neither acids, salts, nor water.

14. Arrhenius defined an acid as:

a)      a species that can donate a proton.
b)      a species that can accept a proton.
c)      a source of OH^- ions in water.
d)     a sourse of H⁺ ions in water.

15. In the Bronsted-Lowry system, a base is defined as:

a)      a proton donor.
b)      a hydroxide donor.
c)      a water-former.
d)     a proton acceptor.

16. According to the Lewis theory, a base _____ .

a)      is a proton acceptor.
b)      is a proton donor.
c)      makes available a share in a pair of electrons.
d)     produces OH^- ions in aqueous solution.

17. According to Bronsted-Lowry concept Acid is any molecule which can

a)      Donate neutron
b)      Which can donate electron
c)      Which can donate proton
d)     Which can donate OH

18. According to Bronsted-Lowry concept NH₃ is

a) Proton donor

b) Bronsted acid

c) Bronsted base

d) Solvent

19. An acid is a compound that gives H+ ions in water and a base is a compound that gives OH– ions in water.This concept was given by

a)      Arrhenius
b)      Lewis
c)      Bronsted
d)     Lowry

20. Which one of the following is the limitation of Arrhenius concept?

a)      free H+ and OH– ions do not exist in water
b)      this concept is limited to water only
c)      some bases do not contain OH– ions
d)     all of these

21.According to Bronsted-Lowry concept, an acid is a substance that

a)      accepts a proton
b)     releases a proton
c)      accepts an electron pair
d)     releases an electron pair

22.A substance accepts a proton. According to Bronsted-Lowry concept it is

a)      an acid
b)     a base
c)      a neutral substance
d)     amphoteric

23. Molecules or ions that can behave both as Bronsted acid and base are called

a)      monoprotic acids
b)      polyprotic acids
c)      amphiprotic substances
d)     polyprotic bases

24. HCO3 – is an example of

a)      conjugate acid
b)      conjugate base
c)      amphiprotic ion
d)     amphoteric ion

25. The strength of a Bronsted acid depends upon its tendency to _______ a proton

a)      gain
b)     donate
c)      react with
d)     none of these

26. According to Lewis concept an acid is _______ acceptor

a)      proton
b)      base
c)      electron
d)     electron pair

27.All cations and molecules that are short of an electron pair act as _______

a)      Lewis acids
b)      Lewis bases
c)      Bronsted acid
d)     Bronsted bases

28. according to Lewis concept, a reaction between an acid and a base is the transfer of

a)      a proton from acid to base
b)      OH– ion from bases to acid
c)      electron pair from acid to base
d)     electron pair from base to acid