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What will be the action of the followin...

What will be the action of the following substances on litmus paper? Dery HCL gas moistened `NH_(3)` gas, lemon juice , carbvonated soft dring, curd, soap solution.

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(i) Dry HCl gas will not change the colour of blue litmus paper. (ii) Moistened `NH_(3)` (i.e. `NH_(4)OH)` will not change the colour of blue litmus. (iii) Colour will change to red (iv) Colour will change to red because in carbonated soft drinks `CO_(2)` gas dissolves to from carbonic acid `(H_(2)CO_(3)).` (v) It will change to red since curd contains lactic acid. (v) It will remain blue in soap solution.
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