clean a small piece of magnesium zinc aluminium and copper by rubbing them with a piece of Sandpaper take them in separate test tube at about 10 ml of Dil HCL to each of them you will find the rate of evolution of hydrogen gas Bubbles is not same in all test tubes and one metal do not evolve any gas write down the increasing order of gas evolved by metals and find the metals which does not involve any gas
Answers
copper will not produce any gases
The increasing order of hydrogen gas evolved by Mg, Zn, and Al is :
Zn < Al < Mg
Copper does not evolve hydrogen gas bubbles.•
•Magnesium, zinc, and aluminum, all the three metals evolve hydrogen gas on reacting with 10 ml of dilute hydrocholric acid. Copper does not evolve hydrogen gas with hydrocholric acid.
• This is because magnesium, aluminum, and zinc, all three lie above hydrogen in the reactivity series, and replace hydrogen from dilute HCl resulting in evolution of hydrogen gas in the form of bubbles.
• The order of evolution of hydrogen gas bubbles by these three metals goes as :
Zn < Al < Mg
Among these three metals, Mg is placed 5 metals above hydrogen, Al is placed 4 metals above hydrogen, and Zn is placed three metals above hydrogen in the reactivity series.
Being, the farthest from hydrogen, Mg evolves H2 at the highest rate, followed by Al, followed by Zn.
• On the other hand, copper lies below hydrogen in the reactivity series, and therefore, cannot replace hydrogen from dilute HCl. Thus, copper does not evolve hydrogen gas on being reacted with dilute hydrocholric acid.