Acids, Bases and Salts
Q1. Choose the most appropriate answer from the following options:
(i) Which one of the following will not produce an acid when made to react with water? [2013][1]
a. Carbon monoxide
b. Carbon dioxide
c. Nitrogen dioxide
d. Sulphur trioxide
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Ans. a. Carbon monoxide
(ii) Identify the metallic oxide which is amphoteric in
nature [2013][1]
a. Calcium oxide
b. Barium oxide
c. Zinc oxide
d. Copper (II) oxide
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Ans. c. Zinc oxide
(iii) To increase the pH value of neutral solution, we
should add: [2017][1]
a. an acid
b. an acid salt
c. an alkali
d. a salt
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Ans. c. an alkali
(iv) An acid which has two replaceable hydrogen ions: [Specimen
2023]
a. Acetic acid
b. Hydrochloric acid
c. Phosphoric acid
d. Carbonic acid
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Ans. d. Carbonic acid
(v) An aqueous compound which turns colourless
phenolphthalein to pink: [Specimen 2023]
a. Ammonium hydroxide
b. Nitric acid
c. Anhydrous calcium chloride
d. Sulphuric acid
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Ans. a. Ammonium hydroxide
Q2. Fill in the blanks with the words given in the list below. [2013][5]
[ammonia, ammonium carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water]
(i) A solution M turns blue litmus red, so it must contain (i) ……………… ions; another solution O turns red litmus blue and hence, must contain (ii) …………… ions.
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Ans. (i) hydronium (ii) hydroxide
(ii) When solutions M and O are mixed together, the product
will be (iii) ……………… and (iv)………….
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Ans. (iii) salt (iv) water
(iii) If a piece of magnesium was put into a solution M,
(v)……………… gas would be evolved.
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Ans. (v) hydrogen
Q3. Give suitable chemical terms for the following:
(i) A salt formed by incomplete neutralization of an acid
by a base. [2013][1]
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Ans. Acid salt
(ii) The substance that releases hydronium ion as the only
positive ion when dissolved in water. [2019][1]
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Ans. Acid
(iii) The chemical property of sulphuric acid to form two
types of salts with an alkali. [2022][1]
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Ans. Dibasicity
Q4. Identify the following substances which are underlined:
(i) An acid which is present in vinegar. [2013][1]
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Ans. Acetic acid
Q5. Fill in the blanks from the choices given within brackets:
(i) The basicity of acetic acid is ………… (3,1,4). [2014][1]
Ans. 1
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this
(ii) Higher the pH value of a solution, the more …………… (acidic/alkaline)
it is. [2016][1]
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Ans. alkaline
(iii) When a metallic oxide is dissolved in water, the
solution formed has a high concentration of ………………… ions. (H+, H3O+,
OH-) [2017][1]
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Ans. OH-
(iv) pH of acetic acid is greater than dilute sulphuric
acid. So acetic acid contains …………… concentration of H+ ions.
(greater, same, low) [2020][1]
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Ans. low
Q6. State the inference drawn from the following observations:
(i) pH of liquid R is 10. What kind of substance is R?
[2014][1]
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Ans. R is alkaline.
Q7. Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively. Which one of these is a: [2018][2]
(i) weak acid
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Ans. Q
(ii) strong alkali?
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Ans. R
Q8. The pH values of three solution, A, B and C are given in the table. Answer the following questions: [2019][3]
|
Solution |
pH value |
|
A |
12 |
|
B |
2 |
|
C |
7 |
(i) Which solution will have no effect on litmus solution?
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Ans. C
(ii) Which solution will liberate CO2 when
reacted with sodium carbonate?
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Ans. B
(iii) Which solution will turn red litmus solution blue?
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Ans. A
Q9. Differentiate between the following pairs based on the information given in the brackets.
(i) Acid and alkali (formation of type of ions) [2020][1]
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Ans. An acid forms a hydronium ion whereas an alkali forms a hydroxide ion.
Q10. Choose the answer from the list which fits the description. [Specimen 2023]
[CaO, CO2, NaOH, Fe(OH)3, CO]
a. A basic oxide.
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Ans. CaO
b. An oxide which is acidic.
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Ans. CO2
c. An alkali.
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Ans. NaOH
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