Question

account for the following
(i) hydrogen does not evolved when a metal reacts with nitric acid
(ii) reaction of iron III oxide with Aluminium is used to join cracked iron​

Answer 1

Answer:

1) HNO3 is an strong oxidizing agent so so it forms NO2gas in order to get reduced as well as it forms water molecules.

2) The reaction of Aluminium and iron oxide is exothermic reaction which is releases a large amount of heat which helps to weld and join the cracks.

Explanation:

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Answer 2

Answer:

1-because nitric acid is highly oxidizing agent

2-because it realese tremendous amount of heat also called thermite process. (tubaday school)