MCQ Questions for Class 10 Science Chapter 2 Acids, Bases and Salts with Answers

 

Acids, Bases and Salts Class 10 MCQs Questions with Answers

Question 1.
A strong acid or base :
(a) is stable in solution
(b) has a higher molecular weight
(c) has a high boiling point
(d) ionises completely in solution.
Answer:
(d) ionises completely in solution.

Question 2.
In the process of neutralization :
(a) an acid is formed
(b) an alkali is formed
(c) a salt is formed
(d) salt and water are formed
Answer:
(d) salt and water are formed

Question 3.
Basicity of an acid depends upon :
(a) replaceable OH atoms
(b) replaceable H atoms
(c) replaceable O atoms
(d) none of these
Answer:
(b) replaceable H atoms

Question 4.
A substance has a tendency to give proton H+ in aqueous solution. This substance is :
(a) acid
(b) base
(c) alkali
(d) salt
Answer:
(a) acid

Question 5.
Strength of an acid and base depends on :
(a) molecular weight
(b) equivalent weight
(c) degree of ionization
(d) boiling point
Answer:
(c) degree of ionization

Question 6.
pH of an aqueous solution is 4. Hydrogen ion concentration mol/litre of this solution is :
(a) 4
(b) 1.0 × 10-4
(c) 10.
(d) 1.0 × 104
Answer:
(d) 1.0 × 104

Question 7.
An aqueous solution of HCl with 108 mol/litre has pH value :
(a) less than 7
(b) 7
(c) 8
(d) 14
Answer:
(c) 8

Question 8.
In alkaline solution colour of methyl orange will be :
(a) red
(b) yellow
(c) blue
(d) colourless
Answer:
(b) yellow

Question 9.
In acidic medium colour of phenolphthalein will be:
(a) pink
(b) yellow
(c) blue
(d) colourless
Answer:
(d) colourless

Question 10.
The chemical name and formula of baking powder are:
(a) sodium chloride (NaCl)
(b) sodium bicarbonate (NaHCO3)
(c) sodium carbonate (Na2CO3)
(d) sodium sulphate (Na2SO4)
Answer:
(b) sodium bicarbonate (NaHCO3)

Question 11.
The formula of washing soda is :
(a) CaCO3
(b) Na2CO3.10H2O
(c) NaOH
(d) Na2.SO4
Answer:
(b) Na2CO3.10H2O

Question 12.
The Chemical used for white-washing is :
(a) Cao
(b) CaCO3
(c) CaOcl2
(d) CaCl2
Answer:
(a) Cao

Question 13.
What is used in fire extinguishers?
(a) NaHCO3
(b) HCl
(c) NaCl
(d) Cacl2
Answer:
(a) NaHCO3

Question 14.
What is used as a disinfectant in drinking water:
(a) CaOCl2
(b) CaCl2
(c) CaCO3
(d) CaSO4
Answer:
(a) CaOCl2

Question 15.
A solution turns red litmus blue, its pH is likely to be:
(a) 1
(b) 4
(c) 5
(d) 10
Answer:
(d) 10

Question 16.
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains :
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl
Answer:
(b) HCl

Question 17.
The number of acidic hydrogen atoms in sulphuric acid is:
(a) 2
(b) 1
(c) 3
(d) Zero
Answer:
(a) 2

Question 18.
Which one of the following types of medicine is used for treating indigestion?
(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic
Answer:
(b) Analgesic

Question 19.
Acetic acid is a weak acid because :
(a) quantity of water is greater
(b) its ionisation is small
(c) it is an organic acid
(d) it is an inorganic acid
Answer:
(c) it is an organic acid

Question 20.
pH value of pure water is :
(a) 0
(b) 1
(c) 7
(d) 14.
Answer:
(c) 7

Question 21.
The strength of hydrochloric acid is 10-2 N. pH value of this solution is :
(a) 1
(b) 2
(c) 3
(d) 0.
Answer:
(b) 2

Question 22.
When pH of rain water goes below 5.6, it is called :
(a) acid rain
(b) base rain
(c) neutral rain
(d) Either (a) or (b)
Answer:
(a) acid rain

Question 23.
The burning sensation on touching nettle leaves is due to:
(a) formic acid.
(b) methanoic acid
(c) ethanoic acid
(d) propanoic acid.
Answer:
(b) methanoic acid

Question 24.
The combination of hydrochloric acid and sodium hydroxide solution forms:
(a) common salt
(b) caustic soda
(c) bleaching powder
(d) baking soda
Answer:
(a) common salt

Question 25.
The chemical name of caustic soda is :
(a) sodium hydroxide
(b) sodium chloride
(c) sodium bicarbonate
(d) calcium sulphate.
Answer:
(a) sodium hydroxide

Question 26.
The pH value of a solution is 3. The solution is :
(a) Basic
(b) Neutral
(c) ACidic
(d) None of them
Answer:
(c) acidic

Question 27.
pH of an acidic solution is :
(a) Less than 7
(b) 7
(c) more than 7
(d) Zero.
Answer:
(a) Less than 7

Question 28.
The possible pH value of acidic rain water is :
(a) 5.2
(b) 6.2
(c) 7.2
(d) 8.2
Answer:
(a) 5.2

Question 29.
The colour of furmeric with alkali :
(a) is yellow
(b) is orange
(c) is brownish red
(d) remains unchanged.
Answer:
(c) is brownish red

Question 30.
Baking powder releases which gas on heating ?
(a) CO
(b) Na2CO3
(c) CO2
(d) O2
Answer:
(c) CO2

Question 31.
The aqueous solution of sulphur dioxide is :
(a) acidic
(b) Basic
(c) Neutral
(d) Amphoteric
Answer:
(a) acidic