8th Standard Science Chapter 10

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8th Standard Science quiz Chapter-10

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8th Standard Science Chapter 10

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Question 11.
A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the identification?

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Question 12.
One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is

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Question 13.
Increase in the OH ion concentration, leads to

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Question 14.
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
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base

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Question 16.
The pH of three solutions X, Y and Z is 6, 4 and 8 respectively. Which of the following is the correct order of acidic strength?

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Question 17.
Which one of the following can be used as an acid-base indicator by a visually impaired student?

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Question 18.
What is gastric acid present in the stomach composed of?

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Question 19.
Which of the following is acidic in nature?

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Question 20.
When the solution of an acid is diluted, what will be the change in pH of the solution?

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2 Acids, Bases and Salts with Answers

Check the below NCERT MCQ Questions for Class 10 Science Chapter 2 Acids, Bases and Salts with Answers Pdf free download. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. We have Provided Acids, Bases and Salts Class 10 Science MCQs Questions with Answers to help students understand the concept very well.

You can refer to NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Acids, Bases and Salts Class 10 MCQs Questions with Answers

Question 1.
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)
(c) (ii) and (iii)
(d) (i) and (iv)

Answer

Answer: (d) (i) and (iv)


Question 2.
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

Question 3.
Two aqueous solutions P and Q have pH of 5 and 13 respectively. The correct inference is that:
(a) solution P is of HCl and Q is of NH4OH
(b) solution P is of CH3COOH and Q is of Ca(OH)2
(c) solution P is of HNO3 and Q is of NH4OH
(d) solution P is of CH3COOH and Q is of NaOH

Answer

Question 4.
The pH of a solution is 7. How can you increase its pH?
(a) By adding a small amount of acid
(b) By adding a small amount of base.
(c) By adding a small amount of salt.
(d) By passing carbon dioxide gas through it.

Answer

Question 5.
Sodium carbonate is a basic salt because it is a salt of
(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

Question 6.
Which gas is evolved when acids react with metals?
(a) O2
(b) CO2
(c) H2
(d) N2

Answer

Question 7.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish- blue?
(a) Lemon juice
(b) Vinegar
(c) Common salt
(d) An antacid

Answer

Question 8.
Which of the following gives the correct increasing order of acidic strength?
(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

Question 9.
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
(a) Wash the hand with saline solution.
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.
(c) After washing with plenty of water and apply solution of sodium hydroxide on the hand.
(d) Neutralise the acid with a strong alkali.

Answer

Question 10.
Farmers neutralise the effect of acidity of the soil by adding
(a) slaked lime
(b) gypsum
(c) caustic soda
(d) baking soda

Answer

Question 11.
A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the identification?
(a) Blue litmus
(b) Red litmus
(c) Sodium carbonate solution
(d) Dilute hydrochloric acid

Answer

Question 12.
One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is
(a) hydrochloric acid
(b) tartaric acid
(c) acetic acid
(d) sulphuric acid

Answer

Question 13.
Increase in the OH ion concentration, leads to
(a) an increases in the pH of solution
(b) a decrease in the pH of the solution
(c) doesn’t alter the pH of the solution
(d) decreases the basic strength of the solution

Answer

Question 14.
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
(iii) 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

Question 15.
A solution has turned the colour of red litmus paper to blue. The pH of the solution is approximately:
(a) 2
(b) 5
(c) 7
(d) 10

Answer

Question 16.
The pH of three solutions X, Y and Z is 6, 4 and 8 respectively. Which of the following is the correct order of acidic strength?
(a) X > Y > Z
(b) Z > Y > X
(c) Y > X > Z
(d) Z > X > Y

Answer

Question 17.
Which one of the following can be used as an acid-base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves

Answer

Question 18.
What is gastric acid present in the stomach composed of?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Lactic acid


Question 19.
Which of the following is acidic in natur


Question 20


Question 21.
When the stopper of a bottle containing colourless liquid was removed, the bottle gave a smell like that of vinegar. The liquid in the bottle could be

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Question 22.
Which of the following is not a mineral acid?

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Question 23.
Which among the following is not a base?

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