MCQs on Cell Constant and Electrochemical Cells

MCQs on Cell Constant and Electrochemical Cells

1. Oxygen has a +2 oxidation state in

1. H₂O
2. H₂O₂
3. F₂O
4. SO₂

Answer: (3)

2. Which of the following is the strongest reducing agent?

1. Li
2. Na
3. Mg
4. Ca

Answer: (1)

3. When the salt bridge is removed from a cell, its voltage

1. will increase
2. will decrease to half
3. will decrease to zero
4. will not change

Answer: (3)

4. When a dilute solution of H₂SO₄ is electrolysed using a platinum electrode, at anode the gas evolved is

1. SO₃
2. SO₂
3. H₂
4. O₂

Answer: (4)

5. The oxidation number of sulphur in Caro’s acid is

1. +4
2. +5
3. +6
4. +8

Answer: (3)

6. Which of the following is the most powerful reducing agent?

1. H₂S
2. H₂SO₃
3. SnCl₂
4. HNO₂

Answer: (1)

7. Which of the following substances can act as both oxidising and reducing agent?

1. KMnO₄
2. K₂Cr₂O₇
3. HNO₃
4. H₂O₂

Answer: (4)

8. Electrolytes conduct electric current

1. by the movement of ions
2. by the movement of atoms
3. by the movement of molecules
4. by the movement of electrons from the cathode to anode

Answer: (4)

9. The reductant may be defined as a substance, whose oxidation no of the atom

1. increases
2. decreases
3. remains constant
4. may increases or decreases

Answer: (1)

10. Which of the following is not an example of an oxidizing agent?

1. hydrogen peroxide
2. potassium dichromate
3. nitric acid
4. hydrogen sulphide

Answer: (4)

11. The conductance in electrolyte conductors is due to

1. Either movement of electrons or ions
2. The flow of free mobile electrons
3. Movement of ions
4. None of the above

Answer: (3)

12. The cell constant of a conductivity cell

1. Changes with a change of concentration of electrolyte
2. Remains constant for a cell
3. changes with a change of electrolyte
4. changes with change in temperature

Answer: (2)