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A sample of soil is mixed with water and...

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish - orange. Which of the following would change the colour of this pH paper to greenish- blue?

A

Lemon juice

B

Vinegar

C

Common salt

D

An antacid

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The correct Answer is:
D
As `pH` paper turns greenish blue for weakly basic compound and antacids contain weak base like `Mg(OH)_(2)`. So an antacid would change the colour of this `pH` paper to greenish-blue . Other options (a) and (b) contain acids and option (c) is a neutral salt.
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NCERT EXEMPLAR-ACIDS, BASES AND SALTS-Acids, Bases And Salts
  1. A sample of soil is mixed with water and allowed to settle. The clear ...

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  2. Which of the following is not a mineral acid?

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  3. Which among the following is not a base?

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  4. Which of the following statements is not correct?

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  5. Match the chemical substances given in column I with their appropriat...

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  6. Equal volumes of hydrochloric acid and sodium hydroxide solutions of s...

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  7. Which of the following is /are true when HCl (g) is passed through wat...

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  8. Which of the following statement is true for acids?

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  9. Which of the following are present in a dilute aqueous solution of hyd...

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  10. Identify the correct representation of reaction occurring during chlor...

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  11. Match the acids given in Coplumn I with their correct source given in ...

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  12. Match the important cvhemicals given in column I with the chemical for...

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  13. What will be the action of the following substances on litmus paper? ...

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  14. Name the acid present in ant sting and give its chemical formula. Also...

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  15. What happens when nitric acid is added to egg shell ?

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  16. A student prepared solutions of (i) an acid and (ii) a base in two sep...

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  17. How would you distinguish between baking powder and washing soda by he...

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  18. Salt 'P', commonly used in bakery products, on heating gets con...

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  19. In one of the industrial processes for manufacture of sodium hydroxide...

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  20. Fill in the missing data in the given table

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  21. What are strong and weak acids? In the following list of acids separat...

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