A) Antacids are bases.
B) A salt is neither acidic nor basic.
C) Phenolphthalein is an indicator.
D) All bases are alkalis but all alkalis are not bases.
Correct Answer: D
Solution :Bases which are soluble in water are called alkalis. But not ail bases are soluble in water. Therefore, all bases are alkalies but all alkalies are not bases.
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