An ore on treatment with dilute HCl produces brisk effervescence. What type of reaction is this? What steps are required to obtain metal from enriched ore?

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Q. And ore on treatment with dilute hydrochloric acid produces brisk effervescence. What type of ore is this? Write the steps required to obtain metal from then restore

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Q. Identify the salts

P

and

Q

from the observations given below:
When dilute

H C l

is added to a salt

Q

, a brisk effervescence is produced and the gas turns lime water milky.
When

N H_{4} O H

solution is added to the above mixture (after adding dilute

H C l

), it produces a white precipitate which is soluble in excess

N H_{4} O H

solution.

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