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NCERT solutions Science Class 10 chapter 2 Acids, Bases and Salts

Chapter 2 - Acids, Bases and Salts

Pages 34 - 35

A solution turns red litmus blue, its pH is likely to be

(a) 1
(b) 4
(c) 5
(d) 10

Q 1 | Page 34

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains

(a) NaCl

(b) HCl

(c) LiCl

(d) KCl

Q 2 | Page 34

10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be

(a) 4 mL

(b) 8mL

(c) 12 mL

(d) 16 mL

Q 3 | Page 34

Which one of the following types of medicines is used for treating indigestion?

(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic

Q 4 | Page 34

Write word equations and then balanced equations for the reaction taking place when dilute sulphuric acid reacts with zinc granules

Q 5.1 | Page 34

Write word equations and then balanced equations for the reaction taking place when − dilute hydrochloric acid reacts with magnesium ribbon.

Q 5.2 | Page 34

Write word equations and then balanced equations for the reaction taking place when dilute sulphuric acid reacts with aluminium powder

Q 5.3 | Page 34

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.

Q 6 | Page 34

Why does distilled water not conduct electricity, whereas rain water does?

Q 7 | Page 34

Why do acids not show acidic behaviour in the absence of water?

Q 8 | Page 35

Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is

(a) neutral?
(b) strongly alkaline?
(c) strongly acidic?
(d) weakly acidic?
(e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.

Q 9 | Page 35

Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. In which test tube will the fizzing occur more vigorously and why?

Q 10 | Page 35

Fresh milk from cows have pH of 6. So how does the pH change when this milk is turned to curd?

Q 11 | Page 35

A milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?

Q 12 | Page 35

 Plaster of Paris should be stored in a moisture-proof container. Explain why?

Q 13 | Page 35

 What is a neutralization reaction? Give two examples.

Q 14 | Page 35

Give two important uses of washing soda

Q 15.1 | Page 35

Give two important uses of  baking soda.

Q 15.2 | Page 35

NCERT Science Class 10

Science Textbook for Class 10
S