Q.1
What is the oxidation state of sulphur in SO(aq)?
  • 4
  • 6
  • 2
  • 0
Q.2
Which of the following elements is the strongest oxidizing agent?
  • Chlorine
  • Aluminium
  • Hydrogen
  • Lithium
Q.3
What is the oxidation number assigned to manganese in KMnO4?
  • 7
  • 5
  • 4
  • 0
Q.4
In the reaction 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
  • Reduced
  • Synthesized
  • Oxidized
  • None of the above
Q.5
A galvanic cell was created with a Calcium and a Copper cell. Which is the correct half equation at the anode?
  • Ca2+(aq)+2e−⟺ Ca(s)Ca^{2+}\left(aq\right)+2e^-\Longleftrightarrow\ Ca\left(s\right)Ca2+(aq)+2e−⟺ Ca(s)
  • Ca++e−⟺ Ca(s)Ca^++e^-\Longleftrightarrow\ Ca\left(s\right)Ca++e−⟺ Ca(s)
  • Cu2+(aq) + e− ⟺ Cu+(aq)Cu^{2+}\left(aq\right)\ +\ e^-\ \Longleftrightarrow\ Cu^+\left(aq\right)Cu2+(aq) + e− ⟺ Cu+(aq)
  • Cu2+(aq) + 2e− ⟺ Cu(s)Cu^{2+}\left(aq\right)\ +\ 2e^-\ \Longleftrightarrow\ Cu\left(s\right)Cu2+(aq) + 2e− ⟺ Cu(s)
Q.6
Based on this equation: 2 I- + 2 Fe → 2Fe + I Which of the following is true about the ionic equation?
  • Fe3+ is oxidized
  • Fe3+ is a reducing agent
  • I- is an oxidizing agent
  • I- donates electrons to Fe3+
Q.7
In the reaction Zn + H--> ZnO2 + H2 which element, if any, is oxidized?
  • Zinc
  • Hydrogen
  • Oxygen
  • None
Q.8
Find the oxidation number of Ca in CaH2
  • -2
  • -4
  • +2
  • +4
  • 0
Q.9
Find the oxidation number of S in S2O4 2-
  • +3
  • +6
  • -6
  • -3
  • -4
Q.10
In an electrochemical cell, tin becomes a negative terminal when it is connected to
  • aluminium
  • lead
  • magnesium
  • zinc
Q.11
A mixture of magnesium oxide, copper(II) oxide and zinc powder is heated in a crucible until no further changes are observed. After heating, the mixture contains:
  • magnesium, copper(II) oxide and zinc
  • magnesium oxide, copper and zinc oxide
  • magnesium oxide, copper(II) oxide and zinc
  • magnesium, copper and zinc oxide
Q.12
Which of the following statements is not true when zinc powder is added to dilute hydrochloric acid?
  • Zinc is oxidised
  • Chloride ion acts as an oxidising agent
  • Hydrogen ion is reduced
  • Electrons are transferred in the reaction
Q.13
In a redox reaction, spectator ions...
  • become oxidised
  • become reduced
  • remain unchanged
  • All of above
Q.14
Another name for a "oxidation-reduction" reaction is
  • chemical reaction
  • neutralization reaction
  • redox reaction
  • nuclear reaction
Q.15
Oxidation is the _________ of electrons.
  • loss
  • gain
  • sharing
  • transfer
Q.16
Gaining hydrogen is an example of...
  • oxidation
  • reduction
Q.17
Gaining oxygen is an example of...
  • oxidation
  • reduction
Q.18
Which of the following half reactions correctly represents a reduction half reaction?
  • Fe →Fe2+ + 2e-
  • Pb4+ + 2e- →Pb2+
  • 2O-2 →O2 + 4e-
  • Fe + 3e- →Fe3+
Q.19
In a reaction, copper is reduced; its number of electrons has:
  • Increased
  • Decreased
  • Remained Constant
  • Varies Randomly
Q.20
If an atom loses electrons during a chemical reaction, the atom was:
  • Oxidized
  • Reduced
  • Neutralized
  • Precipitated
0 h : 0 m : 1 s