Class 10 Science Chapter 2 Acids, Bases and Salts MCQ with answers (40 MCQs)

Question 1
When a solution of an acid contains larger amount of acid, it is said to be-
(a) Dilute
(b) concentrated
(c) Mono basic
(d) poly-basic

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(b) When a solution of acid contains a larger amount of acid, it is said to be concentrated. Concentrated acid solution has high amount of acid present in less amount of water.

Question 2
Metals like sodium, potassium and calcium react with an acid to liberate-
(a) CO₂
(b) NH₃
(c) O₂
(d) H₂

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(d) Metals like sodium, potassium and calcium react with an acid to liberate Hydrogen gas $2Na+2HCl\rightarrow 2NaCl+H_2(gas)$

Question 3
Which of the following is a weak acid?
(a) sulphuric acid
(b) hydrochloric acid
(c) acetic acid
(d) nitric acid

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Question 4
The chemical formula of baking soda is
(a) Na₂Co₃
(b) Na₂Co₃.10H₂O
(c) NaHCO₃
(d) NaOH

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Question 5
Which of the following phenomena occur, when a small amount of acid is added to water?
(a) ionization
(b) Neutralization
(c) Dilution
(d) Salt formation

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(a) and (c) Concentrated acid becomes diluted acid when a tiny amount of acid is added to water. This procedure is known as acid dilution. An aqueous solution, often known as a diluted acid, is one in which the acid undergoes ionisation and releases hydronium ions (H+).

Question 6
Salt form during reaction of sulphuric acid with copper
(a) Na₂SO₄
(b) CuSO₄
(c) K₂SO₄
(d) NH₄CI

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(b) When Sulphuric acid reacts with Copper then Copper sulphate CuSO₄ forms. $Cu+H_2SO_4+H_2$

Question 7
CuSO₄. K₂SO₄ is
(a) acid salt
(b) a mixed salt
(c) normal salt
(d) double salt

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(d) CuSO₄. K₂SO₄ is a double salt. A double salt is a crystalline salt having the composition of a mixture of two simple salts but with a different crystal structure from either.

Question 8
The acid present in vinegar
(a) citric acid
(b) tartaric acid
(c) ascorbic acid
(d) acetic acid

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(d) In vinegar, acetic acid is present.

Question 9
Acid reacts with ____ of metals to form salt and water.
(a) hydroxide
(b) carbonates
(c) oxides
(d) sulphides

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(a) The acids react with hydroxides of metals to form salt and water.

Question 10
Which of these bases is not an alkali?
(a) NaOH
(b) NH₄OH
(c) Al (OH)₃
(d) all of the are alkalies

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Question 11
Which substance is used to purify water
(a) Ammonium chloride
(b) copper sulphate
(c) chlorine
(d) none of these

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Question 12
H₃PO₄is the example of-
(a) hydracids
(b) organic acid
(c) oxyacid
(d) salt

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Question 13
To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
(a) acidic
(b) neutral
(c) basic
(d) corrosive

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Question 14
Which of the following substance will not give carbon dioxide on treatment with dilute acid?
(a) Marble
(b) Limestone
(c) Baking soda
(d) Lime

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Question 15
The reaction between an acid and a base to form a salt and water is called ________ reaction.
(a) neutralization
(b) endothermic
(c) both a and b
(d) none of these

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(a) It is known as a neutralisation reaction when acids and bases interact because the effects of each other are counteracted. Because energy is produced during this reaction, it is exothermic in nature. These reactions produce salt and water as byproducts.
$Acid+Base\rightarrow Salt+Water$
Hence,the correct answer is option (a).

Question 16
An indicator is what type of compound?
(a) reducing agent
(b) strong base or acid
(c) weak base or acid
(d) salt

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(c) Indicators are chemical based compounds used to identify the acidity/alkalinity of a given compound so they should be a very weak acid /base.

Question 17
H₂SO₄ can be prepared by reaction of water with-
(a) NO₂
(b) SO₂
(c) N₂O
(d) SO₃

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(d) ACIDITY OF $Fe(OH)_3$ is : 5 to 8

Question 19
The example of olfactory indicators is
(a) Methyl orange
(b) onion
(c) blue litmus
(d) phenolphthalein

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(b) A substance known as an olfactory indicator changes in smell depending on whether it is combined with an acidic or basic solution. Examples include vanilla extract, onion, and clove oil.

Question 20
The aqueous solution of sodium acetate is
(a) basic
(b) neutral
(c) acidic
(d) none of these

Answers

(a) Since this reaction produces OH- ions, the sodium acetate solution is basic. $$CH_3COONa\rightarrow CH_3COO^- +Na^+\\H_2O\rightarrow H^+ + OH^-\\ CH_3COONa\rightarrow +H_2O\rightarrow CH_3COOH \text{ (Weak acid)}+ NaOH\text{ (Strong Base)}$$ Unlike $H^+$ ions produced by weak acid $CH_3COOH$, which dissociate quickly, $NaOH$ stays completely dissociated to produce large amounts of $OH^-$ ions. As a result, the solution becomes basic due to the abundance of $OH^-$ ions.

Question 21
Bleaching powder is soluble in cold water giving a milky solution due to
(a) Available chlorine
(b) Lime present in it
(c) Calcium carbonate formation
(d) The absorption of carbon dioxide from atmosphere

Answers

(b) Bleaching powder on reaction with cold water form milky solution of calcium hydroxide.
$CaOCl_2+H_2O\rightarrow Ca(OH)_2+Cl_2$
Thus because of the lime present in it, it gives a milky solution when dissolved in water.

Question 22
A blue litmus paper was first dipped in dilute $HCl$ and then in dilute $NaOH$ solution. It was observed that the color of the litmus paper
(a) Changed to red
(b) Changed first to red and then to blue
(c) Changed blue to colorless
(d) Remains blue in both the solutions

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(b) Blue litmus turns red in an acid and turns blue in a basic solution. Thus, blue litmus first turns red before turning blue.

Question 23
The acid used in making of vinegar is
(a) Formic acid
(b) Acetic acid
(c) Sulphuric acid
(d) Nitric acid

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Question 24
A solution turns blue litmus red. The PH of the solution is probably
(a) 8
(b) 10
(c) 12
(d) 6

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(d) A solution is referred to as acidic if its pH value is less than 7. When a solution's pH is higher than 7, it is considered basic, and when it is equal to 7, it is considered neutral.
Because the litmus changes colour from blue to red when the solution is acidic, the pH of the solution is probably 6. (Less than 7).

Question 25
Reaction of an acid with a base is known as
(a) decomposition
(b) combination
(c) redox reaction
(d) neutralization

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(d) When an acid and a base combine, the pH of the resulting solution approaches or equals 7, which denotes a neutral solution.

Question 26
Antacids contains
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid

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(a) Because they include magnesium hydroxide, an inherently weak base, antacids are weak bases.

Question 27
Bleaching powder gives smell of chlorine because
(a) is unstable
(b) gives chlorine on exposure to atmosphere
(c) is a mixture of chlorine and slaked lime
(d) contains excess of chlorine

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(b) Calcium oxychloride is the main ingredient in bleach. $CaOCl_2$ is its chemical formula.
When bleaching powder and atmospheric carbon dioxide interact, calcium carbonate $(CaCO_3)$ and chlorine gas are produced. When exposed to air, it releases chlorine gas and gives off a chlorine smell. The reaction is $CaOCl_2(s)+CO_2(g)\rightarrow CaC)_3(s)+Cl_2(g)$

Question 28
Plaster of paris is made from
(a) lime stone
(b) slaked lime
(c) quick lime
(d) gypsum

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Question 29
Plaster of Paris hardens by
(a)giving of CO₂
(b)changing into CaCO₃
(c)combining with water
(d)giving out water

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Question 30
Which of the following is acidic in nature
(a) apple juice
(b) soap solution
(c) slaked lime
(d) lime

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Question 31
Which of the following acid is present in sour milk ?
(a) glycolic acid
(b) lactic acid
(c) citrus acid
(d) tartaric acid

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Question 32
Milk of magnesium is an example of
(a) base
(b) acid
(c) salt
(d) none of these

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Question 33
A solution react with crushed egg- shells to give a gas that turns lime- water milky. The solution contains
(a) NaCl
(b) HCl
(c) LiCl
(d) KCl

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(b) The egg shell is made up of Calcium carbonate. Therefore, when it reacts with Hydrochloric acid, it forms Calcium chloride, water, and Carbon dioxide.

Question 34
Which of the following is the weak acid
(a) sulphuric acid
(b) hydrochloric acid
(c) acetic acid
(d) nitric acid

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Question 35
Acidity of ammonium hydroxide is
(a) 1
(b) 2
(c) 4
(d) 3

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(a) The number of Hydroxide $(OH^-)$ ions that a base can release when dissolved in water is referred to as the acidity of a base $(H_2O)$. For instance, sodium hydroxide, also known as Caustic soda (NaOH), has an acidity of 1. Ammonium hydroxide's chemical name is $NH_4OH$. One $OH^-$ ion is released when $NH_4OH$ is dissolved in water. As a result, $NH_4OH$ has a pH of 1.

Question 36
Which of the following is not an acidic salt
(a)CuSO₄
(b)Na₂CO₃
(c)ZnSO₄
(d)NH₄NO₃

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Question 37
Basic salts are formed by neutralization of
(a)strong acid and strong base
(b)strong acid and weak base
(c)weak acid and weak base
(d)strong base and weak acid

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Question 38
Plaster of paris is obtained
(a)by adding water to calcium sulphate
(b)by adding sulphuric acid to calcium hydroxide
(c)by heating gypsum to a very high temperature
(d)by heating gypsum to 373 K.

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Question 39
When we heat the carbonates of some metals, we get
(a) SO₂
(b) H₂
(c) CO₂
(d) NO₂

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Question 40
The chemical formula of caustic potash is
(a) $NaOH$
(b) $Ca(OH)_2$
(c) $NH_4OH$
(d) $KOH$

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Question 41
The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas.
Class 10 Science Acid base and Salts MCQ

Class 10 Science Acid base and Salts MCQ

(a) A and D
(b) B and D
(c) A and C
(d) C and D

Answers

Question 42
Which compound in the table reacts with acids to release carbon dioxide?
(a)NaCl
(b)CaSO₄
(c)CaCO₃
(d)MgSO₄

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Question 43
How many grams of Magnesium Sulphate are present in 180g of solid left by evaporation of sea water?
(a)12g
(b)6g
(c)24g
(d)18g

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Question 44
What is the saturated solution of Sodium Chloride called?
(a)Brine
(b)Slaked lime
(c)Soda water
(d)Lime water

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Question 45
What is the pH of the acid which is used in the formation of common salt??
(a)Between 1 and 3
(b)Between 3 and 7
(c)Between 7 and 11
(d)Between 7 and 14

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Acids, Bases and Salts Class 10 MCQ with answers

Acids, bases and salts class 10 mcq

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Acids, Bases and Salts Class 10 MCQ with answers

Acids, bases and salts class 10 mcq

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