solution and electrolytes mcqs

 

CHAPTER 8

SOLUTIONS AND ELECTROLYTES

Q. 1. Islamian genius prepared a salt by the neutralization reaction of a weak acid and weak base. If Pka value for acid is greater than the Pkb value for the base then salt prepared will be

a. soluble in water

b. insoluble in water

c. acidic

d. basic

(d)

 

Q. 2. Equivalent weigh of sulfuric acid is 49, thus 1N solution of sulfuric acid will contain

a. 98g of H2SO4 in 1lit of solution

b. 49g of H2SO4 in 1kg of solvent

c. 49g of H2SO4 in 1lit of solvent

d. 49g of H2SO4 in 1lit of solution

(d)

 

Q. 3. 0.5 Molar solution of NaOH contains

a. 40g of NaOH in 1lit of solution

b. 20g of NaOH in 1lit of solution

c. 80g of NaOH in 1lit of solution

d. 10g of NaOH in 1kg of solvent

(b)

 

Q. 4. 05. molal solution

a. is less concentrated than 0.5 molar solution

b. has come concentration as that of 0.5 molar solution

c. is 0.5 times more concentrated than 0.5 molar solution

d. has concentration equal to 1 molar solution

(a)

 

Q. 5. Mole fraction of water in tap water will be

a. equal to 1

b. less than 1

c. greater than 1

d. will be somewhat equal to 2

(b)

 

Q. 6. Molality of pure water is

a. 36

b. 55.5

c. 18

d. 1

(b)

 

Q. 7. All of the following are postulates of Arrhenius theory of ionization except

a. electrolytes ionize in water to produce cations and anions

b. ionization is reversible processes

c. electrical conductivity of a solution of an electrolyte depends on the extent to which the

electrolyte ionize in the solution

d. strong electrolyte ionize to a greater extent in water

(d)

 

Q. 8. If “X” moles of Ag2Cr2O7 are dissolved in water to produce a saturated solution then Ksp will be

a. 2X2

b. 2X3

c. 4X3

d. X3

(c)

 

Q. 9. A salt was dissolved in water. It was found that ionic product is greater than the solubility product. It means that the

a. solution is unsaturated

b. solution is saturated

c. solution is supersaturated

d. we cannot predict the saturation or unsaturation of the solution for this data

(c)

 

Q. 11. Consider the following cell reaction

Pb + 2Ag+ Pb2+ + 2Ag

If a cell is made based on this equation then

a. lead will act as anode and silver as cathode

b. lead will act as cathode and silver as anode

c. silver will act as cathode because it has greater reduction potential

d. lead will act as anode because it has lesser reduction potential

(a)

 

Q. 12. Consider the following spontaneous reaction

Ni2+ + Mn Ni + Mn2+

If a voltaic cell is made based on this reaction then conventional representation of the cell will be

a. Ni , Ni2+ ║ Mn2+ , Mn

b. Mn , Mn2+ ║ Ni2+ , Ni

c. Mn2+ , Ni ║ Ni , Ni2+

d. Ni , Ni ║ Mn , Mn2+

(b)

 

Q. 13. 0.05 molar H2SO4 solution was present in the laboratory of Islamia College. Islamian genius told his

friends that PH of this solution must be

a. 0.05

b. 0.5

c. 1

d. 2

(c)

 

Q. 14. Buffer is a solution

a. whose PH is constant

b. which resists change in its PH

c. which is strong enough to maintain its PH

d. whose PH may or may not change during a chemical reaction

(b)

 

Consider the following list of indicators of the next two questions

I. Ferroin II. Methyl red

III. Diphenyl amine

IV. Allizarian yellow

V. Bromthymol blue

 

Q. 15. In this list acid base indicators are

a. I and II

b. II, III and V

c. III, IV and V

d. II, IV and V

(d)

Q. 16. In this list redox indicators are

a. I and II

b. II and III

c. I and V

d. III and IV

(a)

 

Q. 17. Consider the following four acids.

H2SO4, HNO3, HCIO4 and HCI

The correct order in which the strength of these acids increases

a. H2SO4 < HNO3 < HCI < HCIO4

b. HCIO4 < HCI < HNO3 < H2SO4

c. HNO3 < H2SO4 < HCI < HCIO4

d. HCIO4 < HCI < H2SO4 < HNO3

(c)

 

Q. 18. An unknown acid is present in a container. If the acid is weak then

a. it will have low PH and low Pka value

b. it will have high Ph and high Pka value

c. it will have low PH but high Pka value

d. it will have high PH but low Pka value

(b)

 

Q. 19. Dr. Khan dissolved three salts Cu(NO3)2, NaHCO3 and (NH4)2SO4 in water to make a saturated

solution. Islamian genius told him that the result solution

a. must be neutral

b. must be basic

c. must be acidic

d. may be acidic, basic or neutral depending on the temperature

(c)

 

Q. 20. Four statements are given below. The correct statement is

a. oxidation state of N in NO and N2O5 is +5 and +2 respectively

b. oxidation state of N in NO and N2O5 is +1 and +5 respectively

c. oxidation state of N in NO and N2O5 is +2 and +5 respectively

d. oxidation state of N in NO and N2O5 is +2 and +4 respectively

(c)

 

Q. 21. Islamian genius told his roommate that for pure water at room temperature

a. molarity is slightly greater then Molality

b. molarity is slightly less then Molality

c. molarity is equal to its Molality

d. concept of Molality and molarity does not applies

(b)

 

Q. 22. One of the following ways of expressing the concentration of a solution does not depend on temperature. It is

a. molarity

b. Molality

c. Normality

d. Formality

(b)

 

Q. 23. Mole fraction of pure water is

a. slightly less then one

b. slightly greater then one

c. exactly equal to one

d. may be any one of the above depending on the temperature of water

(c)

 

Q. 24. A solution contains 3 moles of ethyl alcohol and 7 moles of water. The mole fraction of ethyl alcohol

and water will be

a. 0.7 and 0.3 respectively

b. 0.3 and 0.7 respectively

c. 0.6 and 0.4 respectively

d. 0.2 and 0.8 respectively

(b)

 

Q. 25. Which of the following statements is correct for the life period of a galvanic cell

a. it increases with increase in concentration of cathodic solution

b. it increases with increase in concentration of anodic solution

c. it increases with increase in the size of the cathode

d. it increases with decrease in the size of the anode

(a)

 

Q. 26. Consider the following spontaneous reaction

A + 2B+ A2+ + 2B

The standard reduction potentials are

A2+ /A -0.13V

B+ /B +0.80V

The voltage of this cell will be

a. 0.26V

b. 1.6V

c. 0.67V

d. 0.93V

(d)

 

Q. 27. A spontaneous reaction is for a galvanic cell as a non spontaneous reaction is for

a. Nelson’s cell

b. Down’s cell

c. Electrolytic cell

d. Daniel cell

(c)

 

Q. 28. Acetic acid is a weak electrolyte. Its concentrated aqueous solution will contain

a. CH3COOH and H3O+

b. CH3COO-, OH- and H+

c. CH3COOH, CH3COO- and H+

d. CH3COOH, CH3COO- and H3O+

(d)

 

Q. 29. The strongest base among the following is

a. RbOH

b. KOH

c. NaOH

d. LiOH

(a)

 

Q. 30. Consider the following buffers

a. AI(OH)3 + AI2(SO4)3

b. Fe(OH)3 + FeCI3

c. NH4CI + Na2SO4

d. NaOH + Na2SO4

(b)

 

Q. 31. A solution contains two compounds AI(OH)3 and Zn (OH)2. Solubility products for these compounds are 8.5x10-23 and 1.8 x 10-4 respectively. If NH4OH is added to this solution then

a. both will precipitate at the same time

b. Zn(OH)2 will precipitate first

c. AI (OH)3 will precipitate first

d. Zn (OH)2 or AI (OH)3 will precipitate first depending on the temperature of the solution

(c)