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CBSE - Class 10 Science Acids, Bases and Salts Worksheet

Litmus a natural dye is an extract of

china rose

beetroot

lichen

blue berries

A milkman adds a very small amount of baking soda to fresh milk. (b) Why does this milk take a long time to set as curd?

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?

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

Which of following set of substances contain acids?

grapes, lime water

vinegar, soap

curd, milk of magnesium

curd, vinegar

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

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

Phenolphthalein is a synthetic indicator and its colours on acidic and basic solution, respectively are

red and blue

blue and red

pink and colourless

colourless and pink

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 (d) weakly acidic?

10.

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

11.

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 (e) weakly alkaline?

12.

Write word equations and then balanced equations for the reaction taking place when – (a) dilute sulphuric acid reacts with zinc granules.

13.

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

14.

Lemon water is basic in nature

a. True b. False

15.

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 $HCl$ solution (the same solution as before) required to neutralise it will be

a. (a) 4 mL b. (b) 8 mL c. (c) 12 mL d. (d) 16 mL

16.

The correct way of making a solution of acid in water is to

add water to acid

add acid to water

mix acid and water simultaneously

add water to acid in a shallow container

17.

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Arrange the pH in increasing order of hydrogen-ion concentration.

18.

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

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

19.

Write word equations and then balanced equations for the reaction taking place when – (d) dilute hydrochloric acid reacts with iron filings.

20.

Give two important uses of washing soda and baking soda.

Worksheet Answers

Option C

Option D

14.

Option B

15.

16.

Option B

18.

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