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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Name the reactant and the product. State one use of the product.

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