Question

the gas evolved by heating yellow powder named X, and testing by litmus
paper blue litmus turns into red. Then,
A) Name the oxides formed by X.
B) Write the balanced chemical equation when oxides of X are dissolved in water,
Give reason
26​

Answer 1

X is PbSO2.... Since it is yellow.

The oxide is PbO. And the equation is PbSO2 (heat in presence of O2 ) forms PbO + SO2

Answer 2

Let us find identify the  yellow powder X

Explanation:

(a)The yellow powder "X"that turns blue litmus red is --> Sulphur powder .

It turns moist litmus paper from blue to red .

(b)The oxide formed by it , when it comes in contact with air is "sulphur dioxide ".

S + O₂--> SO₂

(c)The balanced chemical equation : When it is dissolved in water it forms sulphuric acid because the nature of sulphur dioxide is acidic .

SO₂ + H₂O --> H₂SO₃

                       ( sulphurous acid )