Page 1 - 4. HOME ASSIGNMENT-COMBINATION & DECOMPOSITION REACTION)

SAI International School
SAI International School
Class-X
Subject_ Chemistry

Topic-Chemical Reactions and Equations
Sub topic-Types of Chemical Reactions
(Combination, Decomposition Reactions)

Home assignment

MCQs-
➢ 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.

Q1. Assertion: Combustion reactions are also called exothermic oxidation reactions
Reason: In these reactions, oxygen is removed and heat is released.
Q2. Assertion -Colour of Iron sulphate changes when it is heated.
Reason: Water evaporates during the heating of Iron sulphate & change the
colour .
Q3. . Assertion :White silver chloride turns grey in the presence of sunlight.
Reason: Silver chloride undergoes displacement reaction.
Q4. Assertion: Most combination reactions are exothermic
Reason: In exothermic reactions, heat is absorbed
Q5. . Assertion : During electrolysis of water one of the test tube shows twice the
empty spaces as compared to the other.
Reason: Water molecules breaks in to two components .i.e H2 & O2 but the
volume of H2 evolved is double then the volume of O2.

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