WorksheetsRedox Reactions
Total questions: 15
Worksheet time: 15mins
What element is being Reduced?
N
H
O
S
Gaining oxygen is an example of...
oxidation
reduction
Which element is oxidised in the reaction Zn + 2HCl → ZnCl2 + H2
Zinc
Hydrogen
Chlorine
None
Oxidation-reduction reactions occur because of the competition between particles for...
protons
neutrons
electrons
positrons
Which statement correctly describes the oxidation and reduction that occur? Mg + PbCl2_→ MgCl2+ Pb
Mg is oxidized and Cl- is reduced
Mg is oxidized and Pb+2 is reduced
Mg is reduced and Cl- is oxidized
Mg is reduced and Pb+2 is oxidized
What is the oxidation number of Cr in Cr2O72- ?
+14
+6
-6
-14
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+
__________ is reduced in the following reaction:
Cr2O72- + 6 S2O32- + 14H+ > 2Cr3+ + 3S4O62- + 7H2O
Cr2O72-
S2O32-
H+
S4O62-
Which of the following best describes a redox reaction?
A chemical reaction where electrons are transferred
A chemical reaction where electrons are lost
A chemical reaction where electrons are gained
An increase in oxidation number.
more acidic
reduction
less basic
oxidation
A decrease in oxidation number.
redox
reduction
oxidation
dilute
As an element is oxidized, its oxidation number...
increases as electrons are gained
decreases as electrons are gained
decreases as electrons are lost
increases as electrons are lost
Which of the following is a characteristic of a redox reaction?
Transfer of electrons between species
Formation of a precipitate
Absorption of heat
Release of light
In the reaction 2Na+Cl2→2NaCl , which element is reduced?
Sodium (Na)
Chlorine (Cl_2)
Sodium chloride (NaCl)
None
What is the role of a reducing agent in a redox reaction?
It donates electrons and gets oxidized
It accepts electrons and gets reduced
It neither gains nor loses electrons
It acts as a catalyst
