Question 30
Fill in the blanks to complete the following paragraph.

The name of the product formed in the reaction of sulphur and _ is sulphur dioxide gas. When sulphur dioxide is dissolved in , sulphurous acid is formed. The sulphurous acid turns litmus paper to . Generally, oxides of __ are acidic in nature.
After completing the paragraph write two questions which you can raise on the basis of this information.

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Solution

The name of the product formed in the reaction of sulphur and oxygen is sulphur dioxide gas. When sulphur dioxide is dissolved in water, sulphurous acid is formed. The sulphurous acid turns blue litmus paper to red. Generally, oxides of non-metals are acidic in nature.

Questions maybe
(i) Which gas is formed when sulphur reacts with oxygen?
(ii) What is the nature of oxides of non-metals?

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Q. Question 30
Fill in the blanks to complete the following paragraph.

The name of the product formed in the reaction of sulphur and

___ is sulphur dioxide gas. When sulphur dioxide is dissolved in ____, sulphurous acid is formed. The sulphurous acid turns ____ litmus paper to ____. Generally, oxides of ____ are acidic in nature.
After completing the paragraph write two questions which you can raise on the basis of this information.

Fill in the blanks to complete the following paragraph.

The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas. When sulphur dioxide is dissolved in_________________, sulphurous acid is formed. The sulphurous acid turns _____________ litmus paper to ____________. Generally oxides of __________ are acidic in nature.

After completing the paragraph write two questions which you can raise on the basis of this information.

(a) Name the acid formed when sulphur dioxide dissolves in water.

(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

Sulphur dioxide is dissolved in water. The solution is tested for acidic nature. What are the changes you will observe when you dip a litmus paper in the solution?

Give reasons for the following:
(i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water.
(ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid.
(iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
(iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
(v) Sulphuric acid can form two kinds of salts with sodium chloride.
(vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.
(vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.
(viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid.
(ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.
(x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory.
(xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
(xii) Concentrated sulphuric acid must be stored in airtight bottles.
(xiii) Cotton clothes get burnt with concentrated sulphuric acid.
(xiv) H₂SO₄ cannot be prepared by heating sodium sulphate with conc. HCl or HNO₃.

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