Electrochemistry

9th chemistry chapter 7 solved exercise MCQs

1. Spontaneous chemical reactions take place in :

(a) Electrolytic cell

(b) Galvanic cell ✔

(c) Nelson’s cell

(d) Downs cell

2. Formation of water from hydrogen and oxygen is :

(a) Redox reaction ✔

(b) Acid-base reaction

(c) Neutralization

(d) Decomposition

3. Which one of the following is not an electrolytic cell ?

(a) Downs cell

(b) Galvanic cell ✔

(c) Nelson’s cell

(d) Both a and c

4. The oxidation number of chromium is K₂Cr₂O₇ is :

(a) +2

(b) +6 ✔

(c) +7

(d) +14

5. Which one of the following is not an electrolyte ?

(a) Sugar solution ✔

(b) Sulphuric acid solution

(c) Lime solution

(d) Sodium chloride solution

6. The most common example of corrosion is :

(a) Chemical decay

(b) Rusting of iron ✔

(c) Rusting of aluminium

(d) Rusting of tin

7. Nelson’s cell is used to prepare caustic soda along with gases . Which of the following gas is produced at cathode :

(a) Cl₂

(b) H₂ ✔

(c) O₃

(d) O₂

8. During the formation of water from hydrogen and oxygen , which of the following does not occur :

(a) Hydrogen has oxidized

(b) Oxygen has oxidized

(c) Oxygen gains electrons

(d) Hydrogen behaves as oxidizing agent ✔

9. The formula of rust is :

(a) Fe₂O₃.nH₂O ✔

(b) Fe₂O₃

(c) Fe(OH)₃.nH₂O

(d) Fe(OH)₃

10. In the redox reaction between Zn and HCl , the oxidizing agent is :

(a) Zn

(b) H⁺ ✔

(c) Cl^–

(d) H₂

9th chemistry chapter 7 solved exercise short questions

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