The following table lists the pH values of some substances. Solution pH Hydrochloric acid 1 Milk 6 Pure water 7 Baking soda 9 Sodium hydroxide 14 What would happen to the pH of an acid and a base when each is diluted (pure distilled water is added to it)?

When pure distilled water is added to the acid then the pH value of the acid increases and the acid becomes dilute i.e solution becomes less acidic. In the case of base pH value decreases and basic strength decreases i.e it becomes less basic solution.

The pH of three solutions is given in the table. Answer the questions that follow. Solution pH P 1 Q 7 R 14 Which of these solutions could possibly react with zinc metal to produce hydrogen gas?

Generally, a metal reacts with an acid to produce salt and hydrogen gas. When zinc metal reacts with strong acids like hydrochloric acid which has pH value nearly 1 , zinc chloride and hydrogen gas are formed. The reaction is shown below. Zn s + 2 HCl aq → ZnCl 2 aq + H 2 g Bases react with amphoteric metals to liberate hydrogen gas. Zinc reacts with strong base like sodium hydroxide (pH = 14 ) to form sodium zincate and hydrogen gas. The reaction is: Zn + 2 NaOH → Na 2 ZnO 2 + H 2 Hence, P and R solution which has pH 1 and 14 respectively can react with zinc.

The pH of three solutions is given in the table. Answer the questions that follow. Solution pH P 1 Q 7 R 14 Which of these solutions could be formed by the reaction of a metal oxide with water?

Metal oxides when dissolved in water forms a basic solution. The pH value of solution with pH 14 is basic in nature. Hence, solution R could be formed by the reaction of a metal oxide with water.

The pH of three solutions is given in the table. Answer the questions that follow. Solution pH P 1 Q 7 R 14 Which of these solutions could be the raw material for the industrial manufacture of chlorine?

The industrial manufacture of chlorine is done by using sodium chloride solution which is a neutral salt. Its salt solution will have pH value 7 . Hence, solution Q could be the correct material for manufacturing chlorine gas.

Sunita carried out the following reactions in the laboratory: Complete neutralisation of one mole of sodium carbonate with hydrochloric acid Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid She found that the amount of carbon dioxide formed in both the reactions was the same.

When sodium carbonate reacts with hydrochloric acid, a metal salt, carbon dioxide, and water are formed. Na 2 CO 3 + 2 HCl → 2 NaCl + CO 2 + H 2 O When sodium bicarbonate reacts with hydrochloric acid, a metal salt, carbon dioxide, and water are formed. NaHCO 3 + HCl → NaCl + CO 2 + H 2 O From the above two equations, it is clear that in both cases one-mole carbon dioxide is formed. Hence, her finding is correct.

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Which of these graphs shows how the pH of milk changes as it forms curd?

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Important Questions on Acids, Bases and Salts

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10th CBSE

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 10

The following table lists the pH values of some substances.

Solution	pH
Hydrochloric acid	1
Milk	6
Pure water	7
Baking soda	9
Sodium hydroxide	14

What would happen to the pH of an acid and a base when each is diluted (pure distilled water is added to it)?

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 11

The pH of three solutions is given in the table. Answer the questions that follow.

Solution	pH
P	$1$
Q	$7$
R	$14$

Which of these solutions could possibly react with zinc metal to produce hydrogen gas?

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 12

The pH of three solutions is given in the table. Answer the questions that follow.

Solution	pH
P	$1$
Q	$7$
R	$14$

Which of these solutions could be formed by the reaction of a metal oxide with water?

HARD

10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 13

The pH of three solutions is given in the table. Answer the questions that follow.

Solution	pH
P	$1$
Q	$7$
R	$14$

Which of these solutions could be the raw material for the industrial manufacture of chlorine?

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 14

A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegrate and disappear into the acid,

State one other common observation when metals 'dissolve' in acids, Explain the reason for this observation.

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 15

A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegrate and disappear into the acid.

If the acid with the 'dissolved' metal is evaporated, can we get the metal back? Why or why not?

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 16

A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegrate and disappear into the acid.

In this question, the word 'dissolve' is used within quotes. This is because it is not actually an example of dissolving. What is the main difference between a metal 'dissolving' in an acid and sugar dissolving in water?

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10th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 17

Sunita carried out the following reactions in the laboratory:

Complete neutralisation of one mole of sodium carbonate with hydrochloric acid
Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid

She found that the amount of carbon dioxide formed in both the reactions was the same.

Which of these graphs shows how the pH of milk changes as it forms curd?

Important Questions on Acids, Bases and Salts

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