A metallic ore 'x' reacts with dilute hcl to liberate a gas which turns lime water milky. Another ore 'y' gives off a gas
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The gas liberated is CO2 as it turns limewater milky. So x is carbonate ore.
Eg:- let x be CaCO3.
2CaCO3 + 6HCl ------------> 2CaCl3 + 3H20
Hope it helped.
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