Acids And Bases-1

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This mock test of Acids And Bases-1 for Class 10 helps you for every Class 10 entrance exam. This contains 10 Multiple Choice Questions for Class 10 Acids And Bases-1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Acids And Bases-1 quiz give you a good mix of easy questions and tough questions. Class 10 students definitely take this Acids And Bases-1 exercise for a better result in the exam. You can find other Acids And Bases-1 extra questions, long questions & short questions for Class 10 on EduRev as well by searching above.

QUESTION: 1

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?

A.
Baking powder
B.
Lime
C.
Ammonium hydroxide solution
D.
Hydrochloric acid

Solution:

As the solution turns red litmus solution blue, it must be basic. To reverse the change, we must add an acid.

QUESTION: 2

NaOH is obtained by electrolysis of

A.
Aq. solution of NaCl
B.
Aq. Na₂CO₃
C.
Aq. NaHCO₃
D.
Molten NaCl

Solution:

2NaCl + 2H₂O → 2NaOH + H₂ + Cl₂
(Chlor-alkali process)

QUESTION: 3

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

A.
hydrochloric acid
B.
tartaric acid
C.
acetic acid
D.
sulphuric acid

Solution:

Tartaric acid is a leavening agent which is mixed with baking powder to neutralize the bitterness produced by baking powder. It is an important food additive that is being used today. When dry base powder is added to acid forming a solution, it is mixed with cream of tartar which is chemically known as potassium bitartrate.

QUESTION: 4

Lime water reacts with chlorine to form

A.
CaCl₂
B.
CaOCl₂
C.
Ca(CIO₃)₂
D.
CaO₂Cl₂

Solution:

Ca(OH)₂ + Cl₂ → CaOCl₂+ H₂O
(Manufacturing of bleaching powder)

QUESTION: 5

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue ?

A.
Lemon juice
B.
Vinegar
C.
Common salt
D.
An antacid

Solution:

Only a basic solution will change the colour of pH paper to greenish-blue.

and out of all these, only antacid is a base.

lemon juice and vinegar are acid

common salt is neutral

QUESTION: 6

Ag₂S reacts with H₂SO₄ to form

A.
AgSO₄
B.
Ag₂SO₄ + H₂S
C.
Ag₂O+ H₂S
D.
AgOH + H₂S

Solution:

Ag₂S + H₂SO₄ → Ag₂SO₄ + H₂S (Double displacement reaction)

QUESTION: 7

Which of the following statements are true for acids ?

A.
Bitter and change red litmus to blue.
B.
Sour and change red litmus to blue.
C.
Sour and change blue litmus to red.
D.
Bitter and change blue litmus to red.

Solution:

Acids possess sour taste and turn blue litmus paper red.

QUESTION: 8

pH of H₂O is

A.
7
B.
8
C.
9
D.
10

Solution:

pH of H₂O is 7 because it is neutral. It is formed by neutralization reaction.

QUESTION: 9

Which of the following are present in a dilute aqueous solution of hydrochloric acid ?

A.
H₃O⁺ + Cl^-
B.
H₃O⁺ + CH^-
C.
Cl^- + OH^-
D.
Unionised HCl

Solution:

Hydrochloric acid ionises as follows :
HCl→ H⁺ +Cl^-
H⁺ ions combine with water molecules to form H₃O⁺. Therefore, the ions present in dilute aqueous solution of hydrochloric acid are H₃O⁺ and Cl^-.

QUESTION: 10

NaHCO₃ is formed by the reaction of

A.
Na₂CO₃ + HCl
B.
NaCl + H₂CO₃
C.
NaOH + H₂CO₃
D.
NaOH + Na₂CO₃

Solution:

Sodium hydrogen carbonate also known as sodium bicarbonate is produced by chemical reaction between weak acid and strong base.
The acid is Hydrochloric Acid (HCl) and the base is Na₂CO₃

Na₂CO₃ + HCl = NaHCO₃ + NaCl