Question

Electrolyte - Metal salt solution
A pair of tongs
ru
Test tube
9. Pratyush took sulphur powder on a spatula
and heated it. He collected the gas evolved
by inverting a test tube over it, as shown in
figure
(a) What will be the action of gas on
(1) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for
the reaction taking place.
Spatula containing
sulphur powder
Burner
nital​

Answer 1

Explanation:

(a) Action of gas on

(i) dry litmus paper: Dry litmus paper do not turns red or blue with acid or base. So there is no effect on dry litmus paper.

(ii) moist litmus paper: Gas evolved is sulphur dioxide. Since, sulphur dioxide is a non-metallic oxide and non-metallic oxides are acidic in nature. Thus, moist blue litmus paper turns red.

(b) Balance chemical equation for the reaction taking place:

When sulphur is burnt or heated in air, it gives sulphur dioxide gas.

reaction between sulphur and oxygen

Answer 2

Answer:

(a) The action of gas on

(1) dry litmus paper -------- no action

(ii) moist litmus paper-------- blue one turn into red

(b) S + O₂ ------------►SO₂

    SO₂ +H₂O ----------► H₂SO₃

Explanation:

chemical formula of sulpher powder S

if we heat the element the chemical reaction ----

S + O₂ ------------►SO₂

SO₂ is acidic in nature -----

SO₂ +H₂O ----------► H₂SO₃   (it is a weak acid)

In dry litmus paper , SO₂ cannot show its acidic nature, But a miist blue litmus paper will turn into Red one.