Advertisements
Advertisements
Question
Give a chemical test to distinguish between dilute sulphuric acid and conc. sulphuric acid.
Advertisements
Solution
- Dilute sulphuric acid treated with zinc gives hydrogen gas, which burns with a pop sound. Concentrated H2SO4 gives SO2 gas with zinc, and the gas turns acidified potassium dichromate paper green.
- Barium chloride solution gives a white ppt. with dilute H2SO4. This white ppt. is insoluble in all acids. Concentrated H2SO4 and NaCl mixture when heated gives dense white fumes if a glass rod dipped in ammonia solution is brought near it.
RELATED QUESTIONS
Give one equation to show the following properties of sulphuric acid:
As a non-volatile acid
Name the products formed when hot and concentrated sulphuric acid reacts with Carbon.
Why is H2SO4 is not used as a drying agent for H2S?
Name the following :
The precipitate obtained by treating aqueous lead nitrate with dilute sulphuric acid.
Give reason for the following:
When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
Describe the reaction that show
Concentrated sulphuric acid is a non-volatile acid.
- Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
- In the contact process for the manufacture of sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two-step procedure is used. Write the equations for the two steps involved in D.
- What type of substance will liberate sulphur dioxide from sodium sulphite in step E?
- Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
Give one equation to show the following property of sulphuric acid:
As a non-volatile acid
Complete the table given below:
| Name of the process | Reactants | Acid product formed |
| (a) ______ | Nitrogen dioxide + water + oxygen | (b) ______ |
| (c) ______ | Oleum + water | Sulphuric acid |
The property exhibited by concentrated sulphuric acid when it is used to prepare hydrogen chloride gas from potassium chloride is ______.
