Question

iron filling and sulphur to mix together and divided into two parts part a was heated strongly while part B was not heated dilute hydrochloric acid was added to both the parts of evolution of gas was seen in both cases how will you identify the gases write their two characteristic of each gas

Answer 1

Hydrogen gas is evolved in both cases  it's presence can be test , if we bring a burning matchstick near to it ,it will burn with a pop-up sound .

Hope this will be helpful for you please ask if you have any other doubts