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b. More than 7
c. Equal to 7
d. Zero

8. Methyl orange turns yellow when it comes in contact with:
a. Water
b. Salt
c. Acid
d. Base

Subjective Questions:-

Q. Questions Skill Marks
No.
1. Acids are _________ in nature. R 1

2. Which gas is produced when acids react with U 1
metals?
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): Indicators are used for testing acids and
bases.
Reason(R): Indicators change their colour when they come
in contact with acids and bases..
4. What will you observe when: U&A 3
a. A blue litmus paper is put into hydrochloric acid.
b. A cloth with turmeric stain is rubbed with soap.
c. A drop of red litmus solution is added to soap
solution.
5. Name the following: U 5
a. Products formed when acids react with bases.
b. An organic indicator that cannot be used to identify
acids.
c. The gas produced when acids react with active
metals.
d. From where is the common indicator ‘litmus’

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