Page 2 - HOME ASSIGNMENT-1(OBJECTIVE & SUBJECTIVE QUESTIONS)

(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 : Pure water is neither acidic not basic.
Reason: The pH of a solution is inversely proportional to the
concentration of hydrogen ions in it.

Q.5 Assertion : pH = 7 signifies pure water.
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Reason : At this pH, [H+] = [OH ] = 10

Subjective Assessment:

S.L Questions Mark Skill
No.
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R
Q.1 What is meant by p and H in pH? [CBSE 2014]
Q.2 1 u
What is meant by term pH of solution? The pH of rain water
collected from two cities A’ and ‘B’ were found to be 6.0
and 5.0 respectively. The water of which city will be more
acidic? [CBSE 2011]

Q.3 The pH of soil ‘A’ is 7.5, while that of soil “B is 4.5. Which of 3 R+A
the two soils A or B should be treated with powdered chalk
to adjust the pH and why? [CBSE 2016]

Q.4 a. Define a universal indicator. Mention its one use. 3 U+A
b. Solution ‘A’ gives pink colour when a drop of
phenolphthalein indicator is added to it. Solution ‘B’ gives a
red colour when a drop of methyl orange is added to it.
What type of solutions are ‘A’ and ‘B’ and which of these
will have higher pH? [CBSE 2016]
Q.5 5 HOT
(a) Why does aqueous solution of an acid conduct
electricity?
(b) How does the concentration of H3O+ ions change
when a solution of an acid is diluted?
(c) Which one has a higher pH, a concentrated or a dilute
solution of hydrochloric acid?
(d)What would to be the gas evolved on adding dilute to
hydrochloric acid to
(i) Solid sodium carbonate placed in a test tube?
(ii) Zinc metal in a test tube? [CBSE 2018(C)]

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