What are olfactory indicators?

  • A
    Substances that change color in acidic or basic media.
  • B
    Substances whose odour changes in acidic or basic media.
  • C
    Substances that indicate the presence of salts.
  • D
    Substances that are used to measure the $pH$ of a solution.

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Similar Questions

At which value of $pH$ of the inner side of the mouth does the decay of teeth take place?

Explain why:
$(a)$ the colour of copper sulphate crystals changes on heating?
$(b)$ baking soda acts as an antacid?
$(c)$ an acid should be added to water while diluting?

Write balanced chemical equations for the following:
$(a)$ Calcium carbonate reacts with hydrochloric acid.
$(b)$ Calcium oxychloride reacts with hydrochloric acid.
$(c)$ Sodium hydroxide reacts with zinc.

$(i)$ State the purpose of developing $pH$ scale.
$(ii)$ Mention the $pH$ range for acids.
$(iii)$ What is the $pH$ of acid rain and how it affects the aquatic life?

Crystals of copper sulphate are heated in a test tube for some time.
$(a)$ What is the colour of copper sulphate crystals:
$(i)$ before heating, and $(ii)$ after heating?

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