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Hello students.
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Metals react with hcl to form salt and hydrogen gases evolved.
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First question is reaction of calcium with hcl.
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It produces calcium chloride salt and hydrogen gases evolved.
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Balancing the reaction it becomes to hcl.
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Second part is reaction of magnesium with hcl.
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It produces magnesium chloride salt and hydrogen gas is evolved.
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To balance this, 2 hcl is used.
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Third part of the question is reaction of zinc with hcl.
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It produces zinc chloride salt and hydrogen gas.
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Gas is evolved.
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To balance this, 2 hcl is used.
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Fourth question is reaction of fe with hcl.
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It produces salt of fecl2 plus hydrogen gas is evolved...