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(a) What is produced if an acid is added to a base ?

(b) Why does dry HCl gas not change the colour of dry litmus paper ?

(c) What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide) ?

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(a) Salt and water.

(b) Because dry HCl gas has no hydrogen ions (H ions) in it which can impart acidic properties to it.

(c) Pink.

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