7(i)
Seema added a few pieces of copper turnings to a test tube containing concentrated acid P and she noticed that a reddish-brown gas evolved.
(a) Name the acid P used by Seema.
(b) Write a balanced chemical equation for the reaction that took place.
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(a) The acid P is concentrated nitric acid (HNO3).
(b) Cu + 4HNO3 ⟶ Cu(NO3)2 + 2H2O + 2NO2