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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
Identify the acid in the following case:
The acid which produces sugar charcoal from sugar.
Name the products formed when hot and concentrated sulphuric acid reacts with Sugar.
Give reason for the following:
Sulphuric acid can form two kinds of salts with sodium chloride.
Give reason for the following:
Ammonia gas cannot be dried by passing through concentrated sulphuric acid.
Complete the following sentence, choosing the correct word from the given options.
"Concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is ____________ in comparison to these two acids."
Write the equation for the laboratory preparation of the following salts, using sulphuric acid.
Copper sulphate from copper.
Write balanced equation for potassium hydrogen carbonate and dilute sulphuric acid.
A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (ii).
A. Dilute acid (typical acid properties)
B. Non-volatile acid
C. Oxidizing agent
D. Dehydrating agent
(i) Preparation of hydrogen chloride.
(ii) Preparation of ethane from ethanol
(iii) Preparation of copper sulphate from copper oxide.
An acid obtained from concentrated nitric acid on reaction with Sulphur ______.
The property exhibited by concentrated sulphuric acid when it is used to prepare hydrogen chloride gas from potassium chloride is ______.
