Class 7 Science Chapter 5 Acids, Bases and Salts | One Mark Questions

Here are expected one mark questions from class 7 Science Chapter 5 Acids, Bases and Salts

1. Substances which taste sour contain ……………………….

acids

2. Why do some substances taste sour?

Substances taste sour because they contain acids.

3. What is the chemical nature of sour substances?

Acidic

4. Substances which are bitter in taste and feel soapy on touching are known as ………………………..

Bases

5. What is the chemical nature of substances which taste bitter and feel soapy?

Basic

6. What are indicators?

Indicators are special substances used to test whether a substance is acidic or basic.

7. Name some naturally occurring indicators

Litmus, China rose petals, turmeric

8. Name the acid found in vinegar

Acetic acid

9. Which acid is present in ant’s sting?

Formic acid

10. Name the acid found in citrus fruits such as lemons and oranges

Citric acid

11. Which acid is present in curd?

Lactic acid

12. What is the other name of Vitamin C?

Ascorbic acid

13. Name a common fruit containing ascorbic acid

Amla

14. Which acid is present in grapes, unripe mangoes and tamarind?

Tartaric acid

15. Which base is present in lime water?

Calcium hydroxide

16. Window cleaners contain …………………………

Ammonium hydroxide

17. Litmus is obtained from ………………………..

Lichens

18. Litmus turns ………………………. when it is dipped in an acidic solution.

Red

19. Litmus turns …………………….. when it is dipped in a basic solution.

Blue

20. Substances which are neither acidic nor basic are called …………………………..

Neutral substances

21. Acids turn blue litmus paper into ………………..

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red

22. When red litmus paper is exposed to acid, its colour ……………………

does not change

23. Acids ……………………. the colour of turmeric paper.

do not change

24. When blue litmus paper is exposed to bases, its colour …………………….

does not change

25. Bases turn red litmus paper into ………………..

blue

26. Bases turn turmeric paper or turmeric solution to ……………………

red

27. Turmeric solution changes the colour of bases into …………………..

deep red

28. Sugar and salt are ………………………

neutral substances

29. Substances which turn red litmus paper into blue are ……………………. in nature.

basic

30. Substances which turn blue litmus paper into red are ……………………… in nature.

acidic

31. The reaction between an acid and a base is called …………………………..

Neutralisation

32. What is the new substance formed as a result of neutralisation?

Salt

33. When hydrochloric acid (HCl) reacts with Sodium hydroxide (NaOH), we get …………………………….

Sodium chloride (NaCl) and water (H2O)

34. Name the acid present in our stomach

Hydrochloric acid

35. To relieve indigestion caused by acidity, we take antacids which contain ……………………………

Magnesium hydroxide

36. Calamine solution contains …………………………….

Zinc carbonate

37. Baking soda contains …………………………..

Sodium hygrogencarbonate

38. Which bases are used to treat soil that is too acidic?

Quick lime or slacked lime

39. Quick lime contains …………………………

Calcium oxide

40. Slaked lime contains ……………………….

Calcium hydroxide

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