11th class (FSc) Chemistry Unit 10 MCQs
Chapter 10 MCQs 11th Class Chemistry
Electro Chemistry:
1. Oxidation state of carbon in glucose(C6H12O6 ) is:
a. Two
b. Zero
c. Four
d. One
2. The oxidation number of Mn in KMnO4 is:
a. 7
b. 3
c. 9
d. 5
3. Oxidation state of hydrogen in CaH2 is:
a. +2
b. +1
c. Zero
d. -1
4. The oxidation number of Cr in K2Cr2O7 is:
a. +6
b. +14
c. +13
d. 12
5. Sulphur has the highest oxidation state in:
a. H2S
b. SO2
c. H2SO3
d. SO3
6. Oxidation number of oxygen in H2O is:
a. +1
b. -2
c. Zero
d. -1
7. In conversion of Br2 to Br-1 oxidation state of bromine changes from:
a. 0 to 5
b. 0 to -1
c. 2 to 5
d. 0 to -3
8. According to classical concept, oxidation involves:
a. Increase in oxidation
b. Additional of oxygen
c. Removal of hydrogen
d. All of above
9. Oxidation state of Mn in MnO4-2 is:
a. +5
b. +4
c. -6
d. +6
10. In H2SO4the oxidation number of S is:
a. +8
b. +2
c. +4
d. +6
11. Oxidation number of Cl in Ca(ClO3)2 is:
a. -5
b. -1
c. +1
d. +5
12. In which of the following oxidation number of Cr is not +6:
a. Cr2(SO4)3
b. Cr2O72-
c. K2CrO4
d. K2Cr2O7
13. The oxidation number of Fluorine in OF2 is:
a. -1
b. +2
c. +1
d. -2
14. Oxidation number of Chromium Cr2O3 is:
a. +3
b. +1
c. +4
d. +2
15. The oxidation state of oxygen in KO2 is:
a. -1/2
b. -1
c. +2
d. -2
16. In whiich of these changes there is transfer of five electrons:
a. CrO4-2 → Cr+3
b. MnO3-1 → Mn+2
c. Cr2O3-2 → 2Cr+3
d. M nO4-1 → Mn+2
17. In the reaction 2Fe + 3Cl2 → 2FeCl3:
a. Chlorine is oxidized
b. Iron is reduced
c. Iron is Oxidized
d. Neither of the elements is oxidized
18. Which one of the following cells is usd for extraction of Na metal?
a. Down’s cell
b. Nelson’s cell
c. Galvanic cell
d. All of these
19. Nelson’s cell and Down’s cell are examples of:
a. Electrolytic cell
b. Electrochemical cell
c. Galvanic cell
d. None of these
20. Cu metal can be purified in electrolytic cell by making the impure Cuas:
a. Anode and cathode
b. Anode
c. Depends upon nature of solution
d. Cathode
21. When one metal is deposited on the surface of the other by the process of electrical current, it is called:
a. Manufacture of Al
b. Electrolysis
c. Electrolytic purification
d. Manufacture od sodium metal
22. Electrolysis is used for:
a. Manufacture of Al
b. Electroplating
c. Manufacture of sodium metal
d. All of these
23. The cathodic reaction in the electrolysis of dill, H2SO4 with Fe electrode is:
a. Both reduction and oxidation
b. Reduction
c. Neither oxidation or reduction
d. Oxidation
24. If the salt bridge is not used between two half cells, then the voltage:
a. Does not change
b. Decreases rapidly
c. Drops to zero
d. Decreases slowly
25. Electron potential of SHE arbitrarily taken in volts is:
a. 0.01
b. 0.00
c. 0.50
d. 1.00