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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.
State your observation when sugar crystals are added to a hard glass test tube containing conc. 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 a chemical test to distinguish between dilute sulphuric acid and conc. sulphuric acid.
Name the products formed when hot and concentrated sulphuric acid reacts with Sugar.
Name the products formed when hot and concentrated sulphuric acid reacts with Carbon.
Give reason for the following:
H2SO4 cannot be prepared by heating sodium sulphate with conc. HCl or HNO3
Write balanced equation for the reaction of dilute sulphuric acid with the following:
Lead nitrate solution
Write balanced equation for the reaction of dilute sulphuric acid with the following:
Zinc hydroxide
Write the equation of the following reaction:
Sulphur is heated with concentrated sulphuric acid.
Identify the gas evolved and give the chemical test in the following case:
Dilute hydrochloric acid reacts with sodium sulphite.
Identify the salts P and Q from the observation given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution. Which is soluble in ammonium hydroxide solution.
Name the anion present in the following compound:
Compound D, when warmed with dilute sulphuric acid, gives a gas that turns acidified dichromate solution green.
