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Acids, Bases and Salts Class 10 MCQs Questions with Answers
Solving the Acids, Bases and Salts Multiple Choice Questions of Class 10 Science Chapter 2 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Acids, Bases and Salts Class 10 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 2 Science Class 10 and cross-check your answers during preparation.
Question 1.
Assertion: Universal indicator gives green colour with distilled water.
Reason: pH of distilled water is 7 and it is neutral and universal indicator gives green colour with neutral solution.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Question 2.
NaHCO, formed by reaction of
(a) NaOH + H2CO3
(b) NaCl + H2CO3
(c) Na2CO3 + HCl
(d) NaOH + Na2CO3
Answer
(a) NaOH + H2CO3
Question 3.
Calcium phosphate is present in tooth enamel. Its nature is
(a) basic
(b) acidic
(c) neutral
(d) amphoteric
Answer
(a) basic
Question 4.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking power
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid
Answer
(d) Hydrochloric acid
Question 5.
Egg shell is made up of
(a) CaCO3
(b) CaO
(c) Ca(OH)2
(d) CaCl2
Answer
(a) CaCO3
Question 6.
Which of the following is not a acidic salt?
(a) CuSO4
(b) NH4Cl
(c) FeCl3
(d) CH3COONa
Answer
(d) CH3COONa
Question 7.
Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotics
(b) Analgesic
(c) Antacid
(d) Antiseptic
Answer
(c) Antacid
Question 8.
Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
Answer
(a) pink
Question 9.
Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid
Answer
(c) strong base
Question 10.
Rain is called acid rain when its:
(a) pH falls below 7
(b) pH falls below 6
(c) pH falls below 5.6
(d) pH is above 7
Answer
(c) pH falls below 5.6
Question 11.
Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium
Answer
(a) calcium phosphate
Question 12.
What is the pH range of human body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4
Answer
(a) 7.0 – 7.8
Question 13.
A drop of liquid sample was put on the pH paper, paper turned blue. The liquid sample must be of
(a) Lemon Juice
(b) HCl
(c) Sodium bicarbonate
(d) Ethanoic acid.
Answer
(c) Sodium bicarbonate
Question 14.
Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda
Answer
(c) baking soda
Question 15.
At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
Answer
(b) 100°C
Question 16.
Na2CO3 . 10H2O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
Answer
(a) washing soda
Question 17.
Sodium carbonate is a basic salt because it is a salt of a
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base
Answer
(d) weak acid and strong base
Question 18.
Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Answer
(d) Oxalic acid
Question 19.
Brine is an
(a) aqueous solution of sodium hydroxide
(b) aqueous solution of sodium carbonate
(c) aqueous solution of sodium chloride
(d) aqueous solution of sodium bicarbonate
Answer
(c) aqueous solution of sodium chloride
Question 20.
What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water
Answer
(b) Sodium zincate and hydrogen gas
Question 21.
When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
(a) absorb the evolved gas
(b) moisten the gas
(c) absorb moisture from the gas
(d) absorb Cl– ions from the evolved gas
Answer
(c) absorb moisture from the gas
Question 22.
Plaster of Paris is made from
(a) Lime stone
(b) Slaked Lime
(c) Quick lime
(d) Gypsum
Answer
(d) Gypsum
Question 23.
Assertion: Bleaching power liberate chlorine when kept in atmosphere.
Reason: CaOCl2 reacts with CO2 present in atmosphere to form CaCO3 and chlorine gas.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Question 24.
Assertion: Ammonium hydroxide is Weak Base
Reason: Phenolphthalein becomes pink in NH2OH
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Question 25.
Ag2S reacts with H2SO4 to form
(a) AgSO4
(b) Ag2SO4 + H2S
(c) Ag2O + H2S
(d) AgOH + H2S
Answer
(b) Ag2SO4 + H2S
Question 26.
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
Answer
(d) An antacid
Question 28.
Which of the following salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer
(b) Baking soda
Question 29.
How many water molecules does hydrated calcium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Answer
(d) 2
Question 30.
10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of same solution of NaOH, the amount of HCl solution required to neutralize it will be
(a) 4 mL
(b) 8 mL
(c) 12 mL
(d) 16 mL
Answer
(d) 16 mL
Question 31.
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
Answer
(d) Hydrochloric acid
Question 32.
Sodium hydroxide is used
(a) as an antacid
(b) in manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
Answer
(b) in manufacture of soap
Question 33.
A solution reacts with crushed egg-shells to give a gas that turns lime-water milkey. The solution contains
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl
Answer
(b) HCl
Question 34.
When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black
Answer
(b) bluish-green
Question 35.
If pH of solution is 13, it means that if is
(a) Weakly acidic
(b) Weakly basic
(c) Strongly acidic
(d) Strongly Basic
Answer
(d) Strongly Basic
Question 36.
Nettle sting is a natural source of which acid?
(a) Metiwanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
Answer
(a) Metiwanoic acid
Question 37.
Alkalis are
(a) acids, which are soluble in water
(b) acids, which are insoluble in water
(c) bases, which are insoluble in water
(d) bases, which are soluble in water
Answer
(d) bases, which are soluble in water
Question 38.
Plaster of Paris hardens by
(a) Giving off CO2
(b) Changing into
(c) Combining with water CaCO3
(d) Giving out water
Answer
(c) Combining with water
Question 39.
The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
Answer
(c) Vinegar
Question 40.
The H+ ion concentration of a solution is 1.0×10-5m. The solution is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
Answer
(a) Acidic
Question 41.
In terms of acidic strength, which one of the following is in the correct increasing order?
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
Answer
(a) Water < Acetic acid < Hydrochloric acid
Question 42.
An aqueous solution with pH-zero is
(a) Acidic
(b) Alkaline
(c) Neutral
(d) Amphoteric
Answer
(a) Acidic
Question 43.
Which one of the following salts does not con-tain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer
(b) Baking soda
Question 44.
The or dour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
Answer
(c) Vinegar
Question 45.
Setting of Plaster of Paris takes place due to
(a) Oxidation
(b) Reduction
(c) Dehydration
(d) Hydration
Answer
(d) Hydration
Question 46.
Chemical formula of baking soda is:
(a) MgSO4
(b) Na2CO3
(c) NaHCO3
(d) MgCO3
Answer
(c) NaHCO3
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