Question

a.
Visit the chemistry laboratory in your school. With the help of your teacher, burn a small
piece of the following substances:
Sodium
b. Aluminium
Sulphur
C.
After burning them, test the products formed with moist litmus paper (both blue and red
litmus paper). Note your observation and confirm the nature of the products.
please chemestry students tell the answer​

Answer 1

Answer:

When Sodium is burnt in air, it forms Sodium Oxide which is basic (turns red litmus paper blue):

$Na + O_{2}$ ⇒ $Na_{2}O$

When Aluminium is burnt in air, it forms Aluminium Oxide which is also basic (turns red litmus paper blue):

$Al + O_{2}$ ⇒ $Al_{2}O_{3}$

When Sulphur is burnt in air, it forms Sulphur dioxide which is acidic (turns blue litmus paper red):

$S + O_{2}$ ⇒ $SO_{2}$

Note: It is important to also know that a small amount of $SO_{3}$ is also produced during the above reaction.