Assignment for Class 10 Science Chapter 2 Acids Bases Salts
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 2 Acids Bases Salts in standard 10. This test paper with questions and answers for Grade 10 Science will be very useful for exams and help you to score good marks
Chapter 2 Acids Bases Salts Class 10 Science Assignment
MCQ Questions for NCERT Class 10 Science Acids Bases and Salts
Question. An aqueous solution with pH = 1 is
(a) strongly acidic
(b) strongly basic
(c) neutral
(d) weakly acidic
Answer : A
Question. Which of the following is(are) true when HCl (g) is passed through water ?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution.
(iii) It gives both hydrogen and hydroxyl ion in the solution.
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.
(a) (i) only
(b) (iii) only
(c) (ii) and (iv)
(d) (iii) and (iv)
Answer : C
Question. Which among the following is not a base?
(a) NaOH
(b) KOH
(c) NH4OH
(d) C2H5OH
Answer : D
Question. What is the pH range of our body?
(a) 7.0 – 7.8
(b) 7.2 – 8.0
(c) 7.0 – 8.4
(d) 7.2 – 8.4
Answer : A
Question. During the preparation of hydrogen chloride gas 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
Question. Sodium hydroxide is used
(a) as an antacid
(b) in manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
Answer : B
Question. Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Answer : D
Question. Which of the following statement is not correct?
(a) All metal carbonates react with acid to give salt, water and carbon dioxide.
(b) All metal oxides react with water to give salt and acid.
(c) Some metals react with acids to give salt and hydrogen.
(d) Some non-metal oxides react with water to form an acid.
Answer : B
Question. How many water molecules does hydrated cal-cium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Answer : D
Question. Which of the following phenomena occur, when a small amount of acid is added to water ?
(i) Ionisation
(ii) Neutralisation
(iii) Dilution
(iv) Formation
Choose the correct option from the following:
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer : C
Question. Which of the following salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer : B
Question. 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
Question. Which of the following is used for dissolution of gold ?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Aqua regia
Answer : D
Question. NaOH is obtained by electrolysis of
(a) Aq. solution of NaCl
(b) Aq. Na2CO3
(c) Aq. NaHCO3
(d) Molten NaCl
Answer : A
Question. Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?
(a) Red
(b) Yellow
(c) Yellowish green
(d) Blue
Answer : C
Question. Which of the following are present in a dilute aqueous solution of hydrochloric acid?
(a) H3O+ + Cl–
(b) H3O+ + OH–
(c) Cl– + OH–
(d) unionised HCl
Answer : A
Question. Which one of the following can be used as an acid-base indicator by a visually impared (blind) student ?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves
Answer : C
Question. NaHCO, formed by reaction of
(a) NaOH + H2CO3
(b) NaCl + H2CO3
(c) Na2CO3 + HCl
(d) NaOH + Na2CO3
Answer : A
Question. Which of the following statements is true for acids?
(a) Bitter and change red litmus to blue.
(b) Sour and change red litmus to blue.
(c) Sour and change blue litmus to red.
(d) Bitter and change blue litmus to red.
Answer : C
Question. 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
Question. pH of H20 is
(a) 7
(b) 8
(c) 9
(d) 10
Answer : A
Question. Ag2S reacts with H2SO4 to form
(a) AgSO4
(b) Ag2SO4 + H2S
(c)Ag2O + H2S
(d) AgOH + H2S
Answer : B
Question. Lime water reacts with chlorine to form
(a) CaCl2
(b) CaOCl2
(c) Ca(ClO3)2
(d) CaO2Cl2
Answer : B
Question. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus was set up.
Which among the following statement)s) is (are) correct?
(i) Bulb will not glow because electrolyte is not acidic.
(ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
(iii) Bulb will not glow because circuit is incomplete.
(iv) Bulb will not glow because it depends upon the type of electrolytic solution.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) only
(d) (iv) only
Answer : C
Question : Common salt, besides used in kitchen, can also be used as the raw material for making:
i) Washing soda ii) bleaching powder iii) Baking soda iv) slaked lime
(a) i) and ii)
(b) i) and iii)
(c) i), ii) and iii)
(d) i),iii) and iv)
Answer : C
(a) When the pH of the soil increases
Question : The pH of gastric juices released during digestion is:
(a) less than 7
(b) more than 7
(c) Equal to 7
(d) equal to 0
Answer : A
Question : Which of the following salts does not contain water of crystallization?
(a) Blue vitriol
(b) Baking soda
(c) Gypsum
(d) Washing soda
Answer : B
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
Question. Assertion: Ammonium hydroxide is Weak Base
Reason: Phenolphthalein becomes pink in NH2OH
Answer : B
Question. Assertion: Bleaching power liberate chlorine when kept in atmosphere.
Reason: CaOCl2 reacts with CO2 present in atmosphere to form CaCO3 and chlorine gas.
Answer : A
Question. 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.
Answer : A
Question. Assertion: Carbonic acid is weak acid
Reason: It ionised completely in aqueous solution.
Answer : C
Question. Assertion: Copper sulphate is acidic salt.
Reason: It is a salt of weak base [Cu(OH)7] and strong acid (H7SO4).
Answer : A
Important Questions for NCERT Class 10 Science Acids Bases and Salts
Question. What is the colour of methyl orange in NaOH?
Answer: Yellow.
Question. A bud of petunia became reddish purple after first shower of rain. What does it indicate?
Answer: The rain was acid-rain.
Question. How will you test a gas which is liberated when HCl acid reacts with an active metal?
Answer: The gas liberated is hydrogen gas. If we bring a burning splinter near the test tube, the splinter will extinguish with a pop sound.
Question. What is the colour of phenolphthalein in milk of magnesia?
Answer: Pink.
Question. What will happen to blue litmus when it is added to soda water?
Answer: It changes to red.
Question. What are indicators?
Answer: Those substances which change their colour in different types of substances are called indicators.
Question. What would be the colour of litmus in a solution of sodium carbonate?
Answer: The red litmus will change to blue in sodium carbonate solution.
Question. Name a salt which does not contain water of crystallisation.
Answer: Salts like barium sulphate, potassium chloride, sodium nitrate, etc does not contain water of crystallisation.
Question. Dry ammonia gas has no action on litmus paper, but a solution of ammonia in water turns red litmus paper blue. Why is it so?
Answer: Ammonia dissolves in water, forms ammonium hydroxide which is base and turns red litmus blue.
NH3 + H2O → NH4+ + OH–
Dry ammonia gas does not change into OH– ions.
Question. Name an acid-base indicator prepared at home.
Answer: Beetroot extract.
Short Questions :
Question : What is baking powder? How does it make the cake soft and spongy?
Answer : Baking powder is a mixture of sodium hydrogen carbonate and tartaric acid On heating it liberates CO2 which makes the cake soft and spongy
Question : Write the chemical name and formula of the compound which is used as an antacid.
Answer : Sodium bicarbonate, NaHCO3
Question : a) A milk man adds a very small amount of baking soda to fresh milk. Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
b) Mention pH range within which our bodyworks?
c) Explain how antacids give relief from acidity.
d) Mention the nature of tooth pastes. How do they prevent tooth decay?
Answer : a) It is done to prevent the formation of lactic acid which spoils the milk
b) pH range 7.0- 7.8
c) Antacids neutralizes excess of acid in our body and gives relief.
d) Basic) Neutralize the acid formed in the mouth
Question : A gas X reacts with lime water and forms a compound Y which is used as bleaching agent in the chemical industry. Identify X and Y. Give the chemical equation of the reaction involved)
Answer : X is chlorine Y is CaOCl2 (calcium oxy chloride) used as bleaching agent.
Ca (OH)2+ Cl2—–→ CaOCl2 +H2O
Answer : A
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