Class-7 Science – 4 Acids Bases and Salts

 

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#1. Acidic substance taste …….

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#2. Basic substance taste …….

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#3. Feed soapy on touching ……. types of substance.

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#4. Substances that show different colour in acidic, basic and neutral solution are called ……

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Write name of three naturally occurring indicators.

#5. 1st indicator

#6. 2nd indicator

#7. 3rd indicator

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#8. Litmus is extracted from ……..

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#9. Litmus has a ……. colour in distilled water.

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#10. Litmus turns ……. color when added to a basic solution.

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#11. Litmus turns ……. color when added to a acidic solution.

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#12. litmus paper are available in …… colour.

Select all that apply:

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#13. Solution which do not change the color of litmus are known as ……… solution.

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#14. When turmeric paper added to an acidic solution, it turns ……. color.

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#15. When turmeric paper added to an basic solution, it turns ……. color.

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#16. China rose indicator turns acidic solution to …….. color.

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#17. China rose indicator turns basic solution to …….. color.

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#18. Phenolphthalein gives a …… colour when solution is basic.

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#19. Phenolphthalein gives a …… colour when solution is acidic.

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#20. The reaction between an acid and a base is known as ………

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Acid + Base => ……A…… + …..B…….

#21. A

#22. B

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#23. In a neutralization process, what is evolved?

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#24. Write the name of antacid that is used to neutralize the acidity of the stomach.

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#25. Ant bites inject …….. acid into the skin.

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#26. The effect of an ant bite can be neutralised by rubbing moist ………..

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#27. When the soil is too acidic, it is treated with base like ………

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#28. When the soil is too basic, it is treated with ………

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#29. Substances which are neither acidic nor basic are called ……….

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#30. Distilled water is

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Hydrochloric acid + sodium hydroxide => …..A…..+…..B…..

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#31. A

#32. B

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#33. HCL is ……

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#34. NaOH is ….

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#35. Tooth decay is caused by the presence of a …..

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