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Chemistry Multiple Choices Questions

Marks: 1

The value of Kc for the reaction of hydrofloric acid in water to make the aqueous hydronium ion and aqueous fluoride ion is 0.00001606.  The concentration of HF(aq) is 1.2579 M with no products.  What is the equilibrium concentration (in M) of the hydronium ion?

Answer:

 

 

Question

2

Marks: 1

The value of Kc for the reaction of phosphorus pentachloride to make phosphorus trichloride and chlorine is 1.2632.  The concentration of phosphorus pentachloride 1.44929 M with no products.  What is the equilibrium concentration (in M) of chlorine?

Answer:

 

 

Question

3

Marks: 1

The value of KP for the reaction of nitrogen and oxygen to make nitrogen monoxide is 0.000398.  The initial partial pressure of nitrogen monoxide is 1.337 atm with no nitrogen or oxygen.  What is the equilibrium partial pressure (in atm) of oxygen?

Answer:

 

 

Question

4

Marks: 1

The value of KP for the reaction of dinitrogen tetroxide to make nitrogen dioxide is 11.5958.  The partial pressure of dinitrogen tetroxide 1.3119 atm with no nitrogen dioxide.  What is the equilibrium partial pressure (in atm) of nitrogen dioxide?

Answer:

 

 

Question

5

Marks: 1

What is the value of Kc for the reaction of molecular oxygen to ozone if the equilibrium concentration of oxygen is 1.0439 M and of ozone is 0.2904 M?

Answer:

 

 

Question

6

Marks: 1

What is the value of KP for the reaction of nitrogen and oxygen to make dinitrogen monoxide if the equilibrium partial pressures of nitrogen is 1.2398 atm, the partial pressure of oxygen is 1.0889 atm and the partial pressure of dinitrogen monoxide is 0.0266 atm?

Answer:

 

 

Question

7

Marks: 1

What is the value of Qc for the reaction of nitrogen and hydrogen to make ammonia if the concentration of nitrogen is 0.0300 M, of hydrogen is 0.0261 M and of ammonia is 1.136 M?

Answer:

 

 

Question

8

Marks: 1

What is the value of QP for the reaction of nitrogen and oxygen to make dinitrogen tetroxide if the partial pressures of nitrogen is 1.1894 atm, the partial pressure of oxygen is 1.0902 atm and the partial pressure of dinitrogen tetroxide is 0.026853 atm?

Answer:

 

 

Question

9

Marks: 1

If Qc is greater than Kc, then the reaction will

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  

 

Question

10

Marks: 1

If Qc is less than Kc, then the reaction will

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  

 

Question

11

Marks: 1

For the reaction of 2CO(g) + O2(g) –> 2CO2(g), adding a catalyst will cause the reaction to

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  
  e. not change as adding a catalyst will not affect the equilibrium.  

 

Question

12

Marks: 1

For the reaction of 2CO(g) + O2(g) –> 2CO2(g), if the pressure of the reaction vessel is increased by adding CO(g), the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  
  e. not changing as the change in pressure will not affect the equilibrium.  

 

Question

13

Marks: 1

For the reaction of 2CO(g) + O2(g) –> 2CO2(g), if the pressure of the reaction vessel is increased by adding He(g), the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  
  e. not changing as the change in pressure will not affect the equilibrium.  

 

For the reaction of 2CO(g) + O2(g) –> 2CO2(g), increasing the temperature will cause the reaction to

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  
  e. not change as the change in temperature will not affect the equilibrium.  

 

Question

15

Marks: 1

For the reaction of 2NO(g) + O2(g) –> 2NO2(g), decreasing the temperature will cause the reaction to

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  
  e. not change as the change in temperature will not affect the equilibrium.  

 

Question

16

Marks: 1

For the reaction of C2H4(g) + H2(g) –> C2H6(g), decreasing the temperature will cause the reaction to

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  
  e. not change as the change in temperature will not affect the equilibrium.  

 

Question

17

Marks: 1

For the reaction of CO2(g) + NO(g) –> NO2(g) + CO(g), if more CO(g) is added to the reaction vessel, the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  

 

Question

18

Marks: 1

For the reaction of CO2(g) + NO(g) –> NO2(g) + CO(g), if NO(g) is removed from the reaction vessel, the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  

 

Question

19

Marks: 1

For the reaction of CO2(g) + NO(g) –> NO2(g) + CO(g), if the pressure of the reaction vessel is increased by adding CO(g), the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  
  e. not changing as the change in pressure will not affect the equilibrium.  

 

Question

20

Marks: 1

For the reaction of CO2(g) + NO(g) –> NO2(g) + CO(g), if the pressure of the reaction vessel is increased by adding He(g), the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  
  e. not changing as the change in pressure will not affect the equilibrium.  

 

Question

21

Marks: 1

For the reaction of CO2(g) + NO(g) –> NO2(g) + CO(g), if the volume of the reaction vessel is reduced, the equilibrium will be reestablished by the reaction

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shifting to the right by increasing the concentration of the products.  
  b. shifting to the right by increasing the concentration of the reactants  
  c. shifting to the left by increasing the concentration of the products.  
  d. shifting to the left by increasing the concentration of the reactants.  
  e. not changing as the change in volume will not affect the equilibrium.  

 

Question

22

Marks: 1

For the reaction of N2(g) + O2(g) –> 2NO(g), increasing the temperature will cause the reaction to

(Note: For all equilibrium problems, the single direction arrow should be a double arrow representing an equilibrium.)

Choose one answer.

  a. shift to the right by increasing the concentration of the products.  
  b. shift to the right by increasing the concentration of the reactants  
  c. shift to the left by increasing the concentration of the products.  
  d. shift to the left by increasing the concentration of the reactants.  
  e. not change as the change in temperature will not affect the equilibrium.  

 

Question

23

Marks: 1

What is the Bronsted-Lowry definition of a base?

Choose one answer.

  a. A substance that increases the hydrogen ion concentration in water.  
  b. A substance that increases the hydroxide ion concentration in water.  
  c. A substance that accepts proton.  
  d. A substance that donates proton.  

 

Question

24

Marks: 1

What is the Bronsted-Lowry definition of an acid?

Choose one answer.

  a. A substance that increases the hydrogen ion concentration in water.  
  b. A substance that increases the hydroxide ion concentration in water.  
  c. A substance that accepts proton.  
  d. A substance that donates proton.  

 

Question

25

Marks: 1

What is the conjugate acid of water?

Choose one answer.

  a. H+  
  b. H2  
  c. OH  
  d. O2-  

 

Question

26

Marks: 1

Which set is a conjugate acid/base pair?

Choose one answer.

  a. HNO3 / NO2  
  b. HNO2 / NO3  
  c. HSO3 / SO42-  
  d. HSO3 / SO32-  

 

Question

27

Marks: 1

What is the concentration of the hydrogen ion in water when the hydroxide ion concentration is 1.0×10-5 M?

Choose one answer.

  a. 1×10-5M  
  b. 1×10-7M  
  c. 1×10-9M  
  d. 1×10-11M  

 

Question

28

Marks: 1

What is the equilibrium expression for the ion-product constant, Kw?

Choose one answer.

  a. Kw = [H+] [H2O]  
  b. Kw = [H+] [OH]  
  c. Kw = 1 / [H+] [H2O]  
  d. Kw = 1 / [H+] [OH]  

 

Question

29

Marks: 1

What is the hydrogen ion concentration in 0.0009397 M aqueous hydrochloric acid?

Answer:

 

 

Question

30

Marks: 1

What is the hydroxide ion concentration in 0.412 M aqueous barium hydroxide?

Answer:

 

 

Question

31

Marks: 1

The pH of milk is given in your textbook as 6.5, what is the concentration of the hydroxide ion in this solution?

Choose one answer.

  a. [OH] < 10-7 M  
  b. [OH] = 10-7 M  
  c. [OH] > 10-7 M  
  d. Cannot be determined  

 

Question

32

Marks: 1

The pH of tears is given in your textbook as 7.4, what is the concentration of the hydrogen ion in this solution?

Choose one answer.

  a. [H+] < 10-7 M  
  b. [H+] = 10-7 M  
  c. [H+] > 10-7 M  
  d. Cannot be determined  

 

Question

33

Marks: 1

The pH of water exposed to air is given in your textbook as 5.5, what is the pOH of this solution?

Choose one answer.

  a. pOH< 7  
  b. pOH = 7  
  c. pOH> 7  
  d. Cannot be determined  

 

What is the pH of a 1×10-5 M aqueous solution of nitric acid?

Choose one answer.

  a. pH< 7  
  b. pH = 7  
  c. pH> 7  
  d. Cannot be determined  

 

Question

35

Marks: 1

What is the pH of a 1×10-5 M aqueous solution of sodium hydroxide acid?

Choose one answer.

  a. pH< 7  
  b. pH = 7  
  c. pH> 7  
  d. Cannot be determined  

 

Question

36

Marks: 1

What is the pH of a 0.482 M aqueous solution of barium hydroxide?

Answer:

 

 

Question

37

Marks: 1

What is the pOH of a 0.397 M aqueous solution of hydrobromic acid?

Answer:

 

 

Question

38

Marks: 1

What is the strongest acid in water?

Choose one answer.

  a. HCl  
  b. HCN  
  c. H3O+  
  d. HF  

 

Question

39

Marks: 1

What is the strongest base in water?

Choose one answer.

  a. HCOO  
  b. NO2  
  c. OH  
  d. SO42-  

 

Question

40

Marks: 1

Which acid will have the highest concentration of the hydrogen ion in water? All concentrations are equal.

Choose one answer.

  a. HCl  
  b. HCN  
  c. H3O+  
  d. HF  

 

Question

41

Marks: 1

Which acid will have the lowest concentration of the hydrogen ion in water? All concentrations are equal.

Choose one answer.

  a. H2O  
  b. HNO2  
  c. HSO4  
  d. HCOOH  

 

Question

42

Marks: 1

Which base will have the highest concentration of the hydroxide ion in water? All concentrations are equal.

Choose one answer.

  a. Cl  
  b. CN  
  c. F  
  d. H2O  

 

Question

43

Marks: 1

Which base will have the lowest pH in water? All concentrations are equal.

Choose one answer.

  a. HCOO  
  b. NO2  
  c. OH  
  d. SO42-  

 

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