Page 1 - HA

SAI International School
Class-X

Subject_ Chemistry
Topic-Chemical Reactions and Equations
Sub topic-Types of Chemical Reactions

(Redox Reactions)
Home assignment

MCQs
Q.1 A substance which oxidises itself and reduces other is known as -
(a) oxidising agent (b) reducing agent
(c) both of these (d) none of these

Q.2 A redox reaction is one in which-
(a) both the substance are reduced
(b) both the substance are oxidised
(c) an acid is neutralised by the base
(d) one substance is oxidised while the other is reduced

Q.3 When the gases sulphur dioxide and hydrogensulphide mix in the
presence of water, the reaction is
SO 2+ 2H 2S 2H 2O + 3S. Here hydrogen sulphide is acting as -
(a) an oxidising agent (b) a reducing agent
(c) a dehydrating agent (d) a catalyst

For Assertion& Reason question follow the following directions.
DIRECTION:Each of these questions contains an Assertion followed by Reason. Read them
carefully and answer the question on the basis of following options. You have to select the one
that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) If Assertion is correct but Reason is incorrect.

(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
Q.4 Assertion(A) : In a reaction of copper with oxygen,copper serves as a
reducing agent.
Reason (R) : The substance which gains oxygen in a chemical reaction is a
reducing agents.
Q.5 Assertion : In the following chemical equation,
CuO(s) + Zn(s) ZnO(s) + Cu(s)
Zinc is getting oxidised and copper oxide is getting reduced.
Reason : The process in which oxygen is added to a substance is called
oxidation whereas the process in which oxygen is removed from a substance
is called
reduction.

1