Telangana SCERT Class 10 Physical Science Chapter 3 Acids, Bases and Salts Solution

Telangana SCERT Class 10 Physical Science Chapter 3 Solution – Acids, Bases and Salts. Here in this post we provides Class 10 Physical Science Acids, Bases and Salts Telangana State Board Solution.  Telangana State Board English Class X Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.

Telangana State Board Class 10 Physical Science Chapter 3 Acids, Bases and Salts Solution:



Acids, Bases and Salts


Exercise: –

Reflections on concepts

1) An acid or a base is mixed with water. Is this process exothermic or endothermic one?

Ans: – The reaction of water with the acid or base is known as exothermic reaction. As in this reaction the reactants are breaks into and from the salt energy is produce.

2) Distilled water does not conduct electricity. Why?

Ans: – For the conduct of electricity there is needed a positive and negative charged particles but in a distilled water the solution is neutral in nature so there are no such particles for transferring electricity so electricity doesn’t conduct.

3) Draw a neat diagram for showing acid solution in water conducting electricity.

Ans: –

4) Why the flow of acid rain into a river makes the survival of aquatic life in a river difficult?

Ans: – The acid rain is harmful for any aquat6 life. In an acid rain their present various types of dangerous acid such as sulphuric acid, nitric acid which after mixing in water makes the water toxic in nature. So, for these types of environments any aquatic substance doesn’t survive.

5) How does baking powder make the cake soft and spongy?

Ans: – The baking soda is nothing but the sodium bicarbonate. While mixing this baking soda this after the reaction with the water it produces the carbon dioxide which try to liberated from the mixture and make the bread spongy in nature.


Application of concepts

1)  Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11,7 and 9, respectively, classify the solutions as given below.

(a) neutral (b) strongly alkaline (c) strongly acidic (d) weakly acidic (e) weakly alkaline.

Ans: – We know that solution which have PH value more than 7 are basic in nature and which have value less than 7 are known as the acidic solution.

So, (a) neutral is D; (b) strongly alkaline is E; (c) strongly acidic is A; (d) weekly acidic is B (e) weekly alkaline is C.

2) Why does tooth decay start when the pH of mouth is lower than 5.5?

Ans: – The remaining of the food stayed in the mouth after eating which after reaction become acidic in nature. So, by this the PH values decrease and we need the toothpaste as it basic in nature.

3) A milkman adds a very small amount of baking soda to fresh milk. Write reasons for the following.

a) Why does he shift the pH of the fresh milk from acidic nature to slightly alkaline?

b) Why does this milk take a long time to set as curd?

Ans: – The After some time the milk become acidic by this there is a chance for the spoiling of milk. So, the milk man adds some basic substance like sodium bicarbonate or baking soda for increasing the basicity of the milk.

As the PH value of milk is slightly basic in nature. So, for the formation of the curd there is needed some times for the increasing the PH value of the milk. As at this time the Lactobacillus working on for the producing of the curd.


4) Plaster of Paris should be stored in moisture – proof container. Explain why?

Ans: – The plaster of Paris after reaction with the moisture present in air converted into a gypsum which is hard substance. So, the main purpose of the uses of the plaster of Paris is affected as the conversion of it from gypsum is difficult so we need to store it in a place where there is no such moisture.

5) Magnesium ribbons of same size are taken in test tubes A and B. Hydrochloric acid is added to test tube A, while acetic acid is added to test tube B. The concentrations of both the acids are the same. In which test tube will the fizzing occur more vigorously? why?

Ans: – The fizzing from the magnesium ribbon is nothing but the releasing of the hydrogen gas. The acid which is strong will produce more quickly the hydrogen gas as compared to the weak acid. In this as HCl is strong acid the test tube A will fizzing more vigorously that test tube B.


Higher Order Thinking Questions

1) Fresh milk has a pH of 6.6. Explain why the pH changes as it turns into curd?

Ans: – The fresh milk has PH value is 6.6 which changes when it forms to curd. As in while it kept for forming the curd it becomesstronger as compared to fresh milk. The lactobacillus bacteria which take time for the conversion of milk to curd and by this PH value also changes.

2) How do you prepare an indicator using beetroot? Explain.

Ans: – There are present various way of producing of an indicator. One of the ways is that producing the indicator using beetroot and for this we need pot in which we kept some juice of beetroot and added some acidic or basic solution in that after that we cane use this solution as an indicator.



1) The colour of methyl orange indicator in acidic medium is

A) Yellow B) green C) orange D) red.

Ans: – option (D) red.


2) The colour of phenolphthalein indicator in basic solution is

A) yellow B) green C) pink D) orange.

Ans: – option c) pink.


3) Colour of methyl orange in alkali conditions?

A) orange B) yellow C) red D) blue.

Ans: – option (B) yellow.


4) A solution turns red litmus blue; its pH is likely to be

A) 1 B) 4 C) 5 D) 10.

Ans: – option (D) 10.


5) A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution is of

NaCl B) HCl C) LiCl D) KCl.

Ans: – option (b) HCl.


6) If a base dissolves in water by what name is it better known?

A) neutral B) base C) acid D) alkali.

Ans: – option (d) alkali.


7) Which of the following substances when mixed together will produce table salt?

Sodium thiosulphate and sulphur dioxide Hydrochloric acid and sodium hydroxide Chlorine and oxygen

Nitric acid and sodium hydrogen carbonate.

Ans: – option (B).


8) What colour would hydrochloric acid (pH=1) turn universal indicator?

A) orange B) purple C) yellow D) red.

Ans: – option (D) red.


9) Which one of the following types of medicines is used for treating indigestion?

A) antibiotic B) analgesic C) antacid D) antiseptic.

Ans: – option © antacids.


10) What gas is produced when magnesium is made to react with hydrochloric acid?

A) hydrogen B) oxygen C) carbon dioxide D) chlorine.

Ans: – option (a) hydrogen.

More Important Questions

Q.1) MCQ.

1) Lichen is a plant belonging to which of the following division?

a) Bryophyta

b) Thallophyta

c) Pteridophyta

d) None of the above

2) Which of the following is not used as an indicator?

a) Petunia

b) Phenolphthalein

c) Acetic acid

d) Geranium

3) Which of the following is chemical formula of sodium Zincate?

a) Na2 Zn

b) Na Zn

C) Na2 ZnO2

d) None of the above

4) What the “p” in pH Stands for?

a) Power

b) Potenz

C) Parameter

d) None of the above

5) pH of neutral solution is?

a) 6 c) 8

b) 7 d) 9

6) pH of acid rain is…….?

a) Less than 5.6

b) Greater than 6

c) Less than 1

d) None of the above

7) When tooth decay starts?

a) pH of mouth lower than 5

b) pH of mouth greater than 5

c) pH of mouth lower than 5.5

d) None of the above

8) To get rid of indigestion, people take……….?

a) Acid

b) Antacids

c) Alkali

d) None of the above

9) Which of the following is bleaching powder?

a) Ca (OH)2

b) Cao

c) CaOCl2

d) CaCl2

10) Which of the following is plaster of paris?

a) CaCl2

b) CaSO4 2 H2O

c) CaSO4 ½ H2O

d) Cao

11) The colour of methyl orange indicator in acidic medium is………?

a) Yellow

b) Green

c) Orang

d) Red


1) Which gas produce when magnesium reacts with hydrochloric acid?

Hydrogen gas produced.

2) When tooth decay happened?

Tooth decay happened when pH of mouth is lower than 5.5.

3) Define Acid – Base indicator?

Acid – Base indicators are dyes or mixtures of dyes which are used to

Detect the presence of acids and bases.

4) Define water of crystallization?

It is the fixed number of water molecules chemically attached to each

Formula unit of a salt in its crystalline form.

5) Write uses of POP?

POP is used for making toys, materials for decorations and for making Surface smooth.

6) Give the reaction of washing soda and Water?

Na2CO3 + 10 H2O → Na2CO3 10 H2O.


1) Write uses of Sodium Hydrogen Carbonate?

1) It is used as soda-acid in fire extinguisher.

2) It acts as mild antiseptic.

3) It is also used as a ingredient in antacid.

2) Explain pH scale.

A scale for measuring hydrogen ion concentration in a solution is Called pH scale. pH value of solution is simply a number.

Which indicates the acidic or basic nature of a solution.

The pH of neutral solution is 7, value less than 7 on pH scale represent basic solution.

3) Complete the table.



Solution Colour pH



pH value

Nature of


1 HCl Red 5 Colour less
2 CH3COOH Red 4.75 Colour less
3 Distilled water No Colour 7 Colour less


1) Explain plants and animals are pH sensitive or not?

  Living organisms can survive only in a narrow range of pH change When pH of rain water less than 5.6, its called acid rain. When acid Rain flows into rivers, it lowers pH of river water, the survival of Aquatic life in such rivers becomes difficult.

2) Give uses of washing soda?

1) Sodium carbonate is used in glass, soap & paper industries.

2) It is used in manufacture of sodium compounds such as borax.

3) It is used for removing permanent hardness of water.

4) It is used as a cleaning agent.

3) Plaster of Paris should be stored in moisture explain why?

The POP is calcium sulphate, and when the water of crystallization is added to it gypsum is formed, which is very hard material moisture can affect the plaster of Paris by slowing the setting of the plaster due to hydration. It should be stored in moisture proof container.

4) What happened with pH of milk when it changes into curd?

Fresh milk has an acidic character due to its pH is 6. By action of Bacteria, milk changes to curd, which increases the acidity and lower The pH from 6 to less than 6 up to 3-5. The lactose in milk is converted to lactic acid i.e., curd is formed.

Updated: December 22, 2022 — 1:15 am

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