CBSE Class 10 Science Acids Bases and Salts Assignment Set C

Read and download free pdf of CBSE Class 10 Science Chemistry Acids Bases and Salts Assignment. Get printable school Assignments for Class 10 Chemistry. Standard 10 students should practise questions and answers given here for Chapter 2 Acids Bases And Salts Chemistry in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 10 Chemistry Chapter 2 Acids Bases And Salts

Class 10 Chemistry students should refer to the following printable assignment in Pdf for Chapter 2 Acids Bases And Salts in standard 10. This test paper with questions and answers for Grade 10 Chemistry will be very useful for exams and help you to score good marks

Chapter 2 Acids Bases And Salts Class 10 Chemistry Assignment

Question : Which of the following is a double salt ? 
(A) Blue Vitriol
(B) Glauber’s salt
(C) Potash Alum
(D) Potassium Ferrocyanide
Answer : C

Question : The reagent obtained by dissolving Copper sulphate in aqueous solution of Citric acid and Sodium carbonate is...................
(A) Bayer’s reagent
(B) Tollen’s reagent
(C) Fehling reagent
(D) Benedict reagent
Answer : D

Question : When Sodium carbonate (Na2CO3) reacts with Silica (SiO2) gives.................
(A) Soda Glass
(B) Water glass
(C) Crook’s glass
(D) Pyrex glass
Answer : B

Question : In order to decrease the role of setting of Cement, which compound is mixed in it ?
(A) Ca(OH)2 (Slaked lime)
(B) CaCO3 (Calcium Carbonate)
(C) CaSO4.2H2O (Gypsum)
(D) Al2O3 (Alumina)
Answer : C

Question : Which one of the following is not base ? 
(A) B(OH)3
(C) Ca(OH)2
Answer : A

Question : The nature of solution when sodium carbonate is dissolved in water will be
(A) acidic
(B) basic
(C) neutral
(D) amphoteric
Answer : B

Question : pH of a solution is zero. The nature of this solution is 
(A) acidic
(B) basic
(C) neutral
(D) amphoteric
Answer : A

Question : The difference in number of crystalline water molecules in a molecule of gypsum and a molecule of plaster of Paris is 
(A) 5/2
(B) 2
(C) 1/2
(D) 3/2
Answer : D

Question : Match the following : 
(a) formic acid            (i) dehydrating agent
(b) Nitric acid             (ii) organic acid
(c) Electrolyte            (iii) Mineral acid
(d) Conc. H2SO4        (iv) Nacl
(A) (a) (ii), (b) (iii), (c) (iv), (d) (i)
(B) (a) (i), (b)(ii), (c) (iii), (d) (iv)
(C) (a) (iii), (b)(i), (c) (iv), (d) (ii)
(D) (a) (iv), (b)(iii), (c) (i), (d) (ii)
Answer : A

Question : A milkman added a small pinch of baking soda of fresh milk which has pH close to 6. As a result, pH of the medium
(A) became close to 2
(B) became close to 4
(C) did not undergo any changes
(D) became close to 8
Answer : D

Question : Which of the following salts does not contain any water of crystallisation ?
(A) blue vitriol
(B) washing soda
(C) baking Soda
(D) gypsum
Answer : C

Question : The substance which is chemically resistant and can hold aqua regia
(A) Ceramics
(B) Glass
(C) Fibre
(D) Thermosetting plastic
Answer : B

Question : Skin becomes yellow in conc. HNO3 as 
(A) HNO3 acts as an oxidizing agent
(B) HNO2 acts as a dehydrating agent
(C) Nitro-cellulose is formed
(D) The proteins are converted into xantho proteins
Answer : A

Question : Match the items of column I with the items of column II 
Column – I (Polymers)       Column – II
a. aq. NaCl solution           i. Acidic
b. aq. Na2CO3 solution     ii. Basic
c. aq. NH4Cl solution        iii. Neutral
d. aq. CaO solution           iv. Amphoteric
(A) c-i, d-iii, b-ii, a-i
(B) d-i, b-iv, a-iii c-iv
(C) a-iii, b-ii, c-i, d-iii
(D) b-ii, a-iii, d-ii, c-i
Answer : D

Question : The pH of pure water at 25°C is 7. If water is heated to boil, then 
(A) pH will decrease and water will become acidic
(B) pH will increase and water will become basic
(C) pH will decrease but water will remain natural
(D) pH will remain 7
Answer : C

Question : Which of the following is pH of basic solution ?
(A) 7
(B) 4.2
(C) 6.9
(D) 10.2
Answer : B

Question : Which reagent is able to dissolve gold and platinum ? 
(A) Nitric acid
(B) Aqua-regia
(C) Hydrochloric acid
(D) Sulphuric acid.
Answer : B

Question : The conjugate base of H2PO4 is : 
(A) PO43–
(B) P2O5
(C) H3PO4
(D) HPO42–
Answer : D

Question : What is the conjugate base of OH ? 
(A) O2
(B) H2O
(C) O
(D) O2–
Answer : D

Question : Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be :
(A) 3.98 × 108
(B) 3.88 × 106
(C) 3.68 × 10–6
(D) 3.98 × 10–6
Answer : D

Question :Three reactions involving H2PO4 are given below :
(i) H3PO4 + H2O → H3O+ + H2PO4
(ii) H2PO4 + H2O →  HPO42– + H3O+
(iii) H2PO4 + OH– →  H3PO4+ O2–
In which of the above, does H2PO4 act as an acid ?
(A) (ii) only
(B) (i) and (ii)
(C) (iii) only
(D) (i) only
Answer : A

Question : How many litres of water must be added to 1 litre an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2 ? 
(A) 0.1 L
(B) 0.9 L
(C) 2.0 L
(D) 9.0 L
Answer : D

Question : The substance not likely to contain CaCO3 is : 
(A) calcined gypsum
(B) sea shells
(C) dolomite
(D) a marble statue
Answer : A

Question : Tooth pastes are generally 
a. natural
b. acidic
c. basic
d. neutral
Answer : C
Explanation: Toothpastes are generally basic because their function is to react with the excess acid in our mouth and thus prevent tooth decay. 

Question : 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. 12 mL
b. 16 mL
c. 8 mL
d. 4 mL
Answer : B
Explanation: 10 mL of NaOH neutralises 8mL of HCl
i.e. 1 mL of NaOH neutralises 8/10 mL of HCl
so, 20 mL of NaOH will neutralise  8/10 X 20= 16mL of HCl
Question : Which of the following gives CO2 on heating? 
a. Quick lime
b. Limestone
c. Slaked lime
d. Soda ash
Answer : B
Explanation: Limestone (CaCO3) decomposes on heating to produce quicklime (CaO) and CO2 gas.
Question : A group of students, while on excursion trip is campaigning on the hills. One morning, they find themselves engulfed in a thick blanket of snow. One of the senior member of the group suggests to sprinkle common salt on the ice slit covering the pavement. Now answer the following questions: 
i. What is the purpose of sprinkling common salt on ice slit?
ii. Can we use any other substance in place of common salt?
iii. What values are associated with the students?
Answer : i. Sprinkling common salt on icy roads, ice/snow lowers the freezing point of ice due to which the ice or snow melts down. The softened ice/snow can be easily cleared from the roads.
ii. Calcium chloride can be used in place of common salt. It can lower the freezing point up to -55°C.
iii. The students are caring, helping, have supporting nature and have scientific knowledge.
Question : Write the chemical name and formula of baking soda. 
Answer : The chemical name of baking soda is sodium hydrogen carbonate.
The formula of baking soda is NaHCO3.
Question : What is pH paper ? 
Answer : A filter paper soaked in universal indicator and then dried is called pH paper. 
Question : A road tanker carrying an acid was involved in an accident and its contents spilled on the road. At the side of the road iron drain cover began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river. 
(a) Explain why specialist could carry out sample test to see of the river water contains some acid or not
(b) Suggest a better report name for the word 'melting'
(c) Explain why the drain covers began fizzing as the acid ran over them.
Answer : 1. It can be done by adding a strip of blue litmus paper into a tube containing a small amount of sample water if the colour changes into red, this means that some acid has gone into the river.
2. The acid has reacted chemically with the drain cover which is usually made of iron. The correct word is corrosion.
3. Iron reacts with an acid (H2SO4
OR HCl) to evolve H2 gas. Since the gas is released immediately accompanied by large number of bubbles Fizzing of detain covers is expected.
Question : In the following schematic diagram for the preparation of hydrogen gas as shown in the figure, what would happen if the following changes are made?
i. In place of zinc granules, same amount of zinc dust in taken in the test tube.
ii. Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
iii. In place of zinc, copper turnings are taken.
iv. Sodium hydroxide is taken in place of dilute sulphuric acid and the test tube is heated. 
Answer : i. Since the zinc dust has a larger surface area than zinc granules. If the same amount of zinc dust is taken in the test tube then the reaction will be comparatively faster and hydrogen gas will evolve with greater speed.
ii. With dilute hydrochloric acid, almost the same amount of gas is evolved.
iii. With copper turnings, hydrogen gas will not evolve because copper is less reactive and it will not displace hydrogen from the acid. Hence, no reaction will take place.
iv. Zinc also reacts with NaOH. So, if sodium hydroxide is taken, then hydrogen gas will be evolved.


Question : Curd is not kept in copper and brass vessels. Why? 

Question : Pick up acids, bases and salts from the list given below.

HCl, NaCl, KOH, Ca(OH)2, H2CO3, H3PO4, NH4OH, CuSO4, Na2CO3

Question : P & Q are aqueous solutions of sodium chloride and sodium hydroxide respectively. Which of these will turn blue litmus red and which red litmus blue?

Question : Two solutions A and B have pH 5 and 9 respectively. Which solution has higher hydrogen ion concentration and Why?

Question : A farmer is advised to sprinkle quick lime in his crop field. What would be the problem with the pH of the soil?

Question : How does the flow of acid rain water into a river makes the survival of aquatic life difficult.



Question : Tooth enamel is one of the hardest substance in our body.How does it undergo damage due to eating chocolates and sweets?How do toothpastes prevent this damage? 

Question : Write two properties each of acids and bases.

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