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प्रश्न
What would you observe in the following case:
Sugar crystals are added to a hard glass test tube containing concentrated sulphuric acid.
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उत्तर
Charring of sugar takes place. Sulphuric acid dehydrates sugar, leaving behind carbon, which is black. Black charred residue is observed.
\[\ce{C12H22O11 ->[Conc. H2SO4] \underset{Black charred residue}{12 C + 11H2O}}\]
संबंधित प्रश्न
Give two balanced reactions of the type to show the following property of sulphuric acid:
Non-volatile nature
Give a chemical test to distinguish between dilute sulphuric acid and dilute hydrochloric acid.
What would you observe in the following case?
Hot concentrated sulphuric acid is added to sodium chloride crystals.
Why is sulphuric acid known as king of chemicals and oil vitriol ?
What would you see, when a crystal of CuSO4.5H2O is placed in concentrated sulphuric acid? Give reason to explain your observation.
Write the equation for the laboratory preparation of the following salts, using sulphuric acid.
Lead sulphate from lead nitrate.
State your observation for the following case :
Moist blue litmus is introduced into a gas jar of sulphur dioxide.
Write the observation for the following:
Decomposition of bicarbonates by dil. H2SO4.
\[\ce{2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + 2CO2}\]
Write a balanced equation for the following conversion:
Lead sulphate from lead nitrate and sulphuric acid.
A, B and C are the chemical properties of sulphuric acid:
A. Oxidizing agent
B. Dehydrating agent
C. Non-volatile acid
Match the following equations 1 to 3 to the above chemical properties of sulphuric acid.
1. \[\ce{KNO3 + H2SO4 -> KHSO4 + HNO3}\]
2. \[\ce{C12H22O11 -> 12C + 11H2O}\]
3. \[\ce{S + 2H2SO4 -> 2H2O + 3SO2}\]
