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c) It is irreversible
d) Both a) and c)
6. The substances react in a chemical reaction are called......... K

a) Elements
b) Molecules
c) Products
d) Reactants

Subjective

Q. Questions Skill Marks
No.

1. Mention the type of change in the following case. R 1

Formation of rust.

2. In most of the chemical reaction either heat is produced or U 1
absorbed. Indicate the term associated with these types of
reaction.

3. . DIRECTION: Each of these questions contains an U 1
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.
Assertion(A): Rust reduces the outer surface of iron articles.

Reason(R): Iron forms rust only in presence of moisture.

4. a) Why ships suffer a lot of damage at the lower part in spite Hots 2+1
of being painted?
R
b) What is electroplating?

5. What is rust? U & A 5

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