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A) By the properties of non metals we can say that Element 'A' is a non metal as it is soft, brittle and it does not conduct electricity. For example Oxygen.
B) According to the question, Element 'B' is hard, malleable and it conducts electricity, therefore it is a metal.
We know that when a metal reacts with a acid, Salt and Hydrogen is produced.
Acid + Metal → Salt + Hydrogen
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