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WorksheetsREDOX REACTION PART 1 KBSM BY NAJMEN
Total questions: 21
Worksheet time: 13mins
What is the oxidation number of oxygen in oxygen gas, O2?
A -2
B -1
C 0
D +1
What is the oxidation number of Chromium, Cr in Cr2O72-
A +7
B +6
C -7
D -6
What is the oxidation number of manganese in manganate ion, MnO4-
A -7
B +6
C +7
D -6
What is the oxidation number of Carbon in calcium carbonate, CaCO3
A - 4
B +2
C 0
D +4
What is the oxidation number of Carbon in CO32-
A 0
B +4
C +6
D -4
What is the oxidation number of Carbon in CO2
A 0
B +6
C -6
D +4
What is the oxidation number of Nitrogen in NH4+
A +3
B -2
C -3
D +2
What is the oxidation number of Nitrogen in NO2 ?
A +4
B -4
C -6
D +6
What is the oxidation number of nitrogen in NO3- ?
A -6
B -5
C +6
D +5
What is the oxidation number of manganese in KMnO4
A -6
B +6
C +7
D -7
Which of the following is an oxidation process?
A Carbon dioxide loses oxygen
B bromine atom gains an electron
C chlorine molecule gains hydrogen
D sodium atom loses an electron
Which of the following is an oxidation process?
A Carbon dioxide loses oxygen
B bromine atom gains an electron
C chlorine molecule gains hydrogen
D sodium atom loses an electron
Which of the following is an reduction process?
A A sodium atom loses an electron
B A bromine atom gains an electron
C Sulphur dioxide gain oxygen
D A chlorine molecule loses hydrogen
The following equation shows the reaction between carbon and zinc oxide.
C + 2 ZnO → CO2 + 2 Zn
Which statement is true about this reaction?
A Zinc oxide is oxidised to zinc
B Carbon is the reducing agent
C The oxidation number of carbon decreases
D The oxidation number of oxygen increases
Which of the following is not a redox reaction?
A 2 Fe + 3 Cl2 → 2 FeCl3
B 4 FeO + O2 → 2 Fe2O3
C FeCl2 + Mg → MgCl2 + Fe
D FeSO4 + 2 NaOH → Fe(OH)2 + Na2SO4
Which of the following cannot occur during oxidation?
A Gain of oxygen
B Donation of electrons
C Loss of hydrogen
D Decrease in oxidation number
Which of the following is an oxidising agent?
A Sulphur dioxide
B Chlorine
C Potassium bromide
D Hydrogen sulphide
Which of the following is an Reducing agent?
A Chlorine
B Acidified potassium manganate (VII) solution
C Magnesium
D Bromine
Which substance can be used to convert Fe3+ ions to Fe2+ ions?
A Magnesium
B Sulphur dioxide gas
C Potassium manganate(VII) solution
D Acidified potassium dichromate(VI) solution
What is the oxidation number of chromium in K2Cr2O7?
A +6
B +3
C +2
D +1
Which statement defines oxidation?
A Increase in oxidation number
B Gain of hydrogen
C Loss of oxygen
D Gain of electron
