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प्रश्न
Give a chemical test to distinguish between dilute sulphuric acid and conc. sulphuric acid.
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उत्तर
- 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.
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संबंधित प्रश्न
Write balanced chemical equations to show : The oxidizing action of conc. Sulphuric acid on carbon
Give balanced chemical equations for the action of sulphuric acid on the following:
Potassium hydrogen carbonate.
Give reason for the following:
When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
Give reason for the following:
When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
Give reason for the following:
H2SO4 cannot be prepared by heating sodium sulphate with conc. HCl or HNO3
How are the following conversion brought about? Give equation and condition:
Sodium chloride to hydrogen chloride.
Why is sulphuric acid known as king of chemicals and oil vitriol ?
Give reason for the following:
Concentrated sulphuric acid is kept in airtight bottles.
Give one equation to show the following property of sulphuric acid:
As a non-volatile acid
The gas evolved when dilute sulphuric acid reacts with iron sulphide.
