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Topic 11: Redox and electrochemistry
9. Continues
5. Su bstance X can gain or lose electrons in an oxidation – reduction reaction. Which change in
oxidation number is showing substance X losing the most number of electrons?
1) -2 ------- > 0 3) -2 ------- > +1
2) -2 ------- > -4 4) -2 -------- > +2
6. Which change in oxidation number represents the greatest number of electrons lost?
1) -1 to +2 3) -2 to -1
2) +1 to +3 4) +2 to -3
7. Which oxidation number change of a species in a redox reaction represents the least number of
Teacher Preview Copy
electrons gained?
1) -1 to 0 3) -1 to -2
2) -1 to +2 4) -1 to -3
8. In which oxidation number change would a species is a redox reaction gains the most number of
electrons?
1) +3 to -1 3) 0 to +4
2) +6 to +3 4) +3 to +7
10. Oxidation and Reduction: Determining number of electrons lost and gained
+2
+6
1. How many electrons are gained by S ion when it is reduced to S atom?
2) 2
3) 3
1) 1 Teacher Preview Copy 4) 4
3+
2. What is the total number of electrons lost by Al atom as it becomes Al ion?
1) 1 2) 2 3) 3 4) 4
4+
2+
3. Which change occurs when Sn ion is oxidized to Sn ?
1) Two electrons are lost 3) Two protons are lost
2) Two electrons are gained 4) Two protons are gained
3+
4. Which change occurs when N is changes to N atom?
1) Three neutrons are gained 3) Three protons are gained
2) Three positrons are gained 4) Three electrons are gained
3+
6+
5. When Cr ion becomes a Cr ion, there will be a
1) Gain of 3 electrons 3) Gain of 6 electrons
2) Loss of 3 electrons 4) Loss of 6 electrons
6. Consider the oxidation number changes of Atom X and Atom Y below:
Atom X: -2 --------- > +1 Atom Y: +2 --------- > +1
Which is true of Atom X and atom Y
1) Atom X gains 3 electrons, Atom Y loses one electron
2) Atom X gains 3 protons, Atom Y loses one proton
3) Atoms X loses 3 electrons, Atom Y gains one electron
4) Atoms X loses 3 protons, Atom Y gains one protons
322 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Topic 11: Redox and electrochemistry
9. Continues
5. Su bstance X can gain or lose electrons in an oxidation – reduction reaction. Which change in
oxidation number is showing substance X losing the most number of electrons?
1) -2 ------- > 0 3) -2 ------- > +1
2) -2 ------- > -4 4) -2 -------- > +2
6. Which change in oxidation number represents the greatest number of electrons lost?
1) -1 to +2 3) -2 to -1
2) +1 to +3 4) +2 to -3
7. Which oxidation number change of a species in a redox reaction represents the least number of
Teacher Preview Copy
electrons gained?
1) -1 to 0 3) -1 to -2
2) -1 to +2 4) -1 to -3
8. In which oxidation number change would a species is a redox reaction gains the most number of
electrons?
1) +3 to -1 3) 0 to +4
2) +6 to +3 4) +3 to +7
10. Oxidation and Reduction: Determining number of electrons lost and gained
+2
+6
1. How many electrons are gained by S ion when it is reduced to S atom?
2) 2
3) 3
1) 1 Teacher Preview Copy 4) 4
3+
2. What is the total number of electrons lost by Al atom as it becomes Al ion?
1) 1 2) 2 3) 3 4) 4
4+
2+
3. Which change occurs when Sn ion is oxidized to Sn ?
1) Two electrons are lost 3) Two protons are lost
2) Two electrons are gained 4) Two protons are gained
3+
4. Which change occurs when N is changes to N atom?
1) Three neutrons are gained 3) Three protons are gained
2) Three positrons are gained 4) Three electrons are gained
3+
6+
5. When Cr ion becomes a Cr ion, there will be a
1) Gain of 3 electrons 3) Gain of 6 electrons
2) Loss of 3 electrons 4) Loss of 6 electrons
6. Consider the oxidation number changes of Atom X and Atom Y below:
Atom X: -2 --------- > +1 Atom Y: +2 --------- > +1
Which is true of Atom X and atom Y
1) Atom X gains 3 electrons, Atom Y loses one electron
2) Atom X gains 3 protons, Atom Y loses one proton
3) Atoms X loses 3 electrons, Atom Y gains one electron
4) Atoms X loses 3 protons, Atom Y gains one protons
322 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
