What are olfactory indicators?
- ASubstances that change color in acidic or basic media.
- BSubstances whose odour changes in acidic or basic media.
- CSubstances that indicate the presence of salts.
- DSubstances that are used to measure the $pH$ of a solution.
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$(a)$ In place of zinc granules,the same amount of zinc dust is taken in the test tube.
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$(b)$ Instead of dilute sulphuric acid,dilute hydrochloric acid is taken.
$(c)$ In place of zinc,copper turnings are taken.
$(d)$ Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
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