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5. a. The metal which reacts fastest is magnesium; it reacts vigorously with hydrochloric acid.
b. Hydrogen gas
6. a. Aluminium reacts with acid present in the buttermilk.which spoil the butter milk
b. Platinum, gold and silver are used to make jewellery because the metals used in jewellery are always be chosen on the basis of its reactivity. ... They are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.
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