Acid base and salt mcq

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Q1. Which Acid is present in Tomato?

(A) Citric Acid

(B) Oxalic Acid

(D) HCl

Correct Answer: Option (B)

Q2. Which of the following is a strong acid?

(A) HCl pH 1

(B) CH3COOH pH 5

(D) Pure Milk pH 6

Correct Answer: Option (A)

Q3. Na2CO3.10H2O is known as –

(A) Baking soda

(B) Baking powder

(D) Bleaching powder

Correct Answer: Option (C)

Q4. pH value less than 7 indicates that the solution is –

(A) Acidic

(B) Basic

(D) No effect

Correct Answer: Option (A)

Q5. Which of the following is neutral salt?

(A) NH4Cl

(B) CH3COONH4

(D)Na2CO3

Correct Answer: Option (B)

Q6. Lactic Acid is present in –

(A) Orange

(B) Tea

(D) Vinegar

Correct Answer: Option (C)

Q7. Farmers neutralise the effect of Acidity on the soil by adding –

(A) Slaked lime

(B) Gypsum

(D) Baking soda

Correct Answer: Option (A)

Q8. Which of the following are present in a dilute Aqueous solution of hydrochloric acid?

(A) H3O + Cl–

(B) H3O + OH–

(D) Unionised HCl

Correct Answer: Option (A)

Q9. CuSO4.5H2O: In this Compound, the water molecule is called –

(A) Pure water

(B) Water of crystallisation

(D) None of these

Correct Answer: Option (B)

Q10. Which of the following salts does not contain water of crystallisation?

(A) Blue vitriol

(B) Baking soda

(D) Gypsum

Correct Answer: Option (B)

Q11. An aqueous solution turns the red litmus solution blue. Excess addition of which of the following solutions would reverse the change?

(A) Baking powder

(B) Lime

(D) Hydrochloric acid

Correct Answer: Option (D)

Q12. In which pH range does our body work to survive in the atmosphere?

(A) 5.5 to 8.5

(B) 7.0 to 7.8

(D) 7.5 to 12.5

Correct Answer: Option (B)

Q13. What is the chemical formula of POP (Plaster of Paris)?

(A) CaSO4.2H2O

(B) CaSO4.3H2O

(D) CaCO3.1/2H2

Correct Answer: Option (C)

Q14. What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) The temperature of the solution increases

(ii) The temperature of the solution decreases

(iii) The temperature of the solution remains the same

(iv) Salt formation takes place

(A) (i) only

(B) (i) and (iii)

(D) (i) and (iv)

Correct Answer: Option (D)

Q15. Which salt is acidic in nature?

(A) NH4Cl

(B) CH3COONH4

(D)Na2CO3

Correct Answer: Option (A)

Q16. When a base reacts with a metal, it forms a salt, and hydrogen gas is released. By what method can the presence of hydrogen be detected?

(A) by water

(B) by litmus paper

(D) by a burning candle

Correct Answer: Option (D)

Q17. The image shows the pH values of four solutions on a pH scale.

CBSE Class 10 Science MCQ Chapter 2 Acids Bases and Salt-1

Which solutions are alkaline in nature?

(A) A and B

(B) B and C

(D) A and D

Correct Answer: Option (C)

Q18. At what temperature is gypsum heated to form Plaster of Paris?

(A) 35°C

(B) 70°C

(D) 100°C

Correct Answer: Option (D)

Q19. Sodium carbonate reacts with hydrochloric acid and produces –

(A) NaCl

(B) CO2

(D) All of the above

Correct Answer: Option (D)

Q20. Which acid is present in tamarind?

(A) Tartaric acid

(B) Oxalic Acid

(D) Citric Acid

Correct Answer: Option (A)

1. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) Temperature of the solution decreases
(ii) Temperature of the solution increases
(in) Temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) and (iv)
(b) (i) and (iii)
(c) (ii) only
(d) (ii) and (iv)
Answer
Answer: d
2. 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/ Explanation
Answer: c
Explaination: Reason: Guard tube drys (absorbs water) from calcium chloride on a humid day.
3. 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
Answer: b
4. 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
Answer: a
5. 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/ Explanation
Answer: b
Explaination: Reason: Zn + 2NaOH → Ma2Zn02 (Sodium Zincate) + H2
6. Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Answer
Answer: d
7. 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
Answer: c
8. Na2CO3 . 10H2O is
(a) washing soda
(b) baking soda
(c) bleaching powder
(d) tartaric acid
Answer
Answer: a
9. At what temperature is gypsum heated to form Plaster of Paris?
(a) 90°C
(b) 100°C
(c) 110°C
(d) 120°C
Answer
Answer: b
10. How many water molecules does hydrated cal-cium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Answer/ Explanation
Answer: d
Explaination: Reason: Chemical formula of hydrated calcium sulphate or gypsum is CaSO4.2H2O
11. 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
Answer: d
12. 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
Answer: d
13. Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(in) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer/ Explanation
Answer: d
Explaination: Reason: Stronger the acid, lesser is the pH. Stronger the base, higher is the pH.
14. The apparatus given in the adjoining figure was set up to demonstrate electrical conductivity.

Which of the following statement(s) is (are) correct?
(i) Bulb will not glow because electrolyte is not acidic.
(ii) Bulb will glow because HCl is a strong acid 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
Answer: c
15. Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(c) baking soda
(d) washing soda
Answer/ Explanation
Answer: c
Explaination:
16. Nettle sting is a natural source of which acid?
(a) MetiWanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
Answer
Answer: a
17. Tooth enamel is made up of
(a) calcium phosphate
(b) calcium carbonate
(c) calcium oxide
(d) potassium
Answer
Answer: a
18. 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
Answer: a
19. 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
Answer: c
20. Sodium hydroxide is a
(a) weak base
(b) weak acid
(c) strong base
(d) strong acid
Answer/ Explanation
Answer: c
Explaination: Reason: Sodium hydroxide ionises in water and produces a large amount of hydroxide ions.
21. 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
Answer: d
22. When copper oxide and dilute hydrochloric acid react, colour changes to
(a) white
(b) bluish-green
(c) blue-black
(d) black
Answer/ Explanation
Answer: b
Explaination: Reason: Blue-green colour of solution is due to the formation of copper (II) chloride.
23. Sodium hydroxide is used
(a) as an antacid
(b) in manufacture of soap
(c) as a cleansing agent
(d) in alkaline batteries
Answer
Answer: b
24. Sodium hydroxide turns phenolphthalein solution
(a) pink
(b) yellow
(c) colourless
(d) orange
Answer
Answer: a
25. Chemical formula of washing soda is
(a) Na2C03 . 7H2O
(b) Na2C03 . 5H2O
(c) Na2C03 . 2H2O
(d) Na2C03 . 10H2O
Answer
Answer: d
Fill in the blanks
1. Acids turn …………. litmus solution…………. .
2. pH of basic solution is always …………. than 7.
3. …………. are the products obtained when bleaching powder reacts with dilute sulphuric acid.
4. Potassium nitrate has pH value equal to …………. .
5. …………. is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form.
6. …………. is one of the raw materials for the production of baking soda.
7. The salts of a strong acid and weak base are …………. with pH value …………. than 7.
8. Use of mild base like …………. on the bee-stung area gives relief.
9. During indigestion the stomach produces too much …………. and this causes pain and irritation.
10. The presence of …………. Ca in acids is responsible for their acidic properties.
11. Mixing an acid or base with water results in decrease in the concentration of per unit volume.
This process is called
12. Among HCl, H2SO4 and CH3COOH, …………. is a weak acid.
Answers
1. blue, red
2. more/greater
3. CaSO4, Cl2, H2O
4. 7 or seven
5. Water of crystallisation
6. Sodium chloride
7. acidic, less
8. baking soda
9. acid (HCl)
10. H+
11. OH– ions/H3O+ ions, dilution
12. CH3COOH
Que 1. Aqua regia is being prepared by which of the given acids?
(a) Nitric acid and Hydrochloric acid
(b) Citric acid and Nitric acid
(c) Sulphuric acid and Hydrochloric acid
(d) Sulphuric acid and Citric acid
Ans. (a) Nitric and Hydrochloric acid
Explanation: Aqua regia is being prepared by mixing nitric and hydrochloric acid.

Que 2. What does the pH value denote?
(a) Purity of milk
(b) Analysing the nature of a solution
(c) Checking the intensity of an earthquake
(d) It is used for developing photographic negatives
Ans. (b) Analysing the nature of a solution
Explanation: The pH value of a solution denotes the nature of the solution i.e whether a solution is acidic, basic, or neutral.

Que 3. When a pH value of a solution shows 7, then a solution is?
(a) Acidic
(b) Basic
(c) Neutral
(d) None of these
Ans. (c) Neutral
Explanation: The Solution having a pH value of 7 is a neutral solution.

Que 4. Which of the following pH value shown by Acids?
(a) 7
(b) 9
(c) 8
(d 6
Ans. (d) 6
Explanation: The acidic solution contains a pH value of less than 7.

Que 5. When a given solution turns red litmus blue, it indicates?
(a) The solution is alkaline
(b) the solution is acidic
(c) The solution is neither acidic nor basic
(d)None of the above
Ans. (a) The solution is alkaline
Explanation: The solution which turns red litmus blue, indicates that the solution is alkaline.

Que 6. Which of the following is present in a maximum amount in acid rain?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Ammonium nitrate
Ans. (b) Sulphuric acid
Explanation: Sulphuric acid is present in the maximum amount in acid rain.

Que 7. An aqueous solution of copper sulphate solution shows an acidic character, what does it mean?
(a) It undergoes photolysis
(b) It undergoes dialysis
(c) It undergoes electrolysis
(d) It undergoes hydrolysis
Ans. (d) It undergoes hydrolysis
Explanation: An aqueous solution of copper sulphate solution shows an acidic character when it undergoes hydrolysis.

Que 8. Sodium Chloride is a product of?
(a) Strong acid and strong base
(b) Strong acid and weak base
(c) Strong base and weak acid
(d) Weak acid and weak base
Ans. (a) Strong acid and strong base
Explanation: Sodium Chloride is a product of strong acid and a strong base.

Que 9. Which of the following is majorly present in the ocean?
(a) Calcium Carbonate
(b) Magnesium Sulphate
(c) Sodium Chloride
(d) Potassium Chloride
Ans. (c) Sodium Chloride
Explanation: Sodium Chloride is majorly present in the ocean.

Que 10. What is the chemical name of baking soda?
(a) Calcium Carbonate
(b) Potassium Chloride
(c) Sodium Bicarbonate
(d) Hydrogen Chloride
Ans. (c) Sodium Bicarbonate
Explanation: Sodium Bicarbonate is the chemical name of baking soda.

Que 11. Which of the given acids does not contain Oxygen?
(a) Sulphuric Acid
(b) Nitric Acid
(c) Hydrochloric Acid
(d) None of these
Ans. (c) Hydrochloric Acid
Explanation: Hydrochloric Acid contains a mixture of Hydrogen and Chlorine. It does not contain Oxygen.

Que 12. What is the nature of Soda water?
(a) Alkaline
(b) Acidic
(c) Oxidising
(d) Reducing
Ans. (b) Acidic
Explanation: Soda water is acidic

Que 13. What is Nila thotha that refers to?
(a) Potassium Chloride
(b) Copper Sulphate
(c) Hydrochloric acid
(d) Sodium Hydroxide
Ans. (b) Copper Sulphate
Explanation: Copper Sulphate is the chemical name of Nila thotha. It is a compound of Copper and Sulphate.

Que 14. What is the common name of sodium hydroxide?
(a) Neela thotha
(b) Kala Azar
(c) Caustic soda
(d) None of these
Ans. (c) Caustic soda
Explanation: The common name of sodium hydroxide is caustic soda.

Que 15. What are Antacids?
(a) Salts
(b) Acids
(c) Buffer
(d)Bases
Ans. (d) Bases
Explanation: Antacids are bases. they are formed by Aluminum Hydroxide, Magnesium Hydroxide, Calcium Carbonate, etc.

Que 16. What is the chemical name of Epsom salt?
(a) Potassium chloride
(b) Sulphur dioxide
(c) Magnesium Sulphate
(d) Sodium Carbonate
Ans. (c) Magnesium Sulphate
Explanation: Magnesium Sulphate is the chemical name of Epsom salt.

Que 17. What is the chemical name of Bleaching Powder?
(a) Calcium Oxychloride
(b) Ammonium Chloride
(c) Calcium Carbonate
(d) Calcium Hydroxide
Ans. (a) Calcium Oxychloride
Explanation: Calcium Oxychloride is the chemical name of Bleaching Powder.

Que 18. Which of the following were used to develop Photographic plates?
(a) Sliver Iodide
(b) Sodium Thiosulphate
(c) Hydrochloric acid
(d) Bromine
Ans. (b) Sodium Thiosulphate
Explanation: Sodium Thiosulphate is used to develop Photographic plates.

Que 19. Which of the Following given options is coated on a Photographic plate?
(a) Sodium Hydroxide
(b) Potassium Chloride
(c) Silver oxide
(d) Silver Bromide
Ans. (d) Silver Bromide
Explanation: Photographic plates are coated with Silver Bromide.

Que 20. Which of the following is viscous in nature?
(a) Water
(b) Gas
(c) Alcohol
(d) Honey
Ans. (d) Honey
Explanation: Honey is viscous in nature.

1.  Which one of the following is acidic?
(a) Lemon juice    (b) Tomatoes    (c) Milk    (d) All
2.  Which one of the following will turn red litmus blue?
(a) Vinegar    (b) Baking soda solution    (c) Lemon juice    (d) Soft drinks
3.  Which one of the following will turn blue litmus red?
(a) Vinegar    (b) Lime water    (c) Baking soda solution    (d) Washing soda solution
4.  Methyl orange is
(a) Pink in acidic medium, yellow in basic medium
(b) Yellow in acidic medium, pink in basic medium
(c) Colourless in acidic medium, pink in basic medium
(d) Pink in acidic medium, colourless in basic medium.
5.  Lime water is
(a) CaO    (b) Ca(OH)2    (c) CaCO3    (d) CaCI2
6.  The nature of calcium phosphate is present in tooth enamel is
(a) Basic    (b) Amphoteric    (c) Acidic    (d) Neutral
7.  Which of the following salts has no water of crystallization?
(a) Blue vitriol    (b) Washing soda    (c) Baking soda    (d) Gypsum
8.  The function of quick lime in soda lime mixture is to
(a) Absorb moisture present in soda lime
(b) Increase the efficiency of soda lime
(c) Increase the pH of soda lime
(d) Take part in reaction with NaOH
9.  The Ph of a solution of HCL is 4. This shows that the molarity of the solution is
(a) 4.0M    (b) 0.4M    (c) 0.0001M    (d) 0.001M
10.  The difference of molecules of water in gypsum and PoP is
(a)5/2    (b) 2b    (c) 3/2    (d) ½
11.  Which of the following does not form an acidic salt?
(a) Phosphoric acid    (b) Carbonic acid    (c) Hydrochloric acid    (d) Sulphuric acid
12.  The chemical formula of caustic potash is
(a) NaOH    (b) Ca(OH)2    (c) NH4OH    (D) KOH
ANSWERS
    1.    (d)
    2.    (b)
    3.    (a)
    4.    (a)
    5.    (b)
    6.    (a)
    7.    (c)
    8.    (a)
    9.    (a)
    10. (c)
    11. (b)
    12. (d)

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