Question

Kanika takes a burning substance and
collects the evolved vapours in a test
tube, making sure that they do not escape.
A small amount of water is added to the
test tube. To the solution obtained, a few
drops of blue litmus solution are added.
The litmus solution turns red. Which of the
following could be the burning substance?​

Answer 1

Answer:

as the solution turns blue litmus into red it is confirm that it is an acidic solution. on burning metals and nonmetals the oxides are formed. non metal forms acidic oxides. therefore the substance which Kanika burned must be non metal here ( Mg,Na and Fe are metals while S is a non metal)

Answer 2

The burning substance in the experiment is Sulphur.

• Sulphur is a non-metal and has the chemical formula as S.
• In the experiment, since It is an acidic solution, thus the solution turns blue litmus to red whose oxides are formed on burning metals and non-metals.
• Non-metals generally form acidic oxides and the substance burnt by her must therefore, be a non-metal, thus Sulfur is a non-metal.