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प्रश्न
Identify the gas evolved and give the chemical test in the following case:
Dilute hydrochloric acid reacts with sodium sulphite.
उत्तर
Gas Evolved:
When dilute hydrochloric acid reacts with sodium sulphite, the gas evolved is sulphur dioxide.
Reaction:
\[\ce{Na2SO3 + 2HCl -> 2NaCl + H2O + SO2 ^}\]
Chemical Test for sulphur dioxide: Pass the gas through an acidified potassium dichromate \[\ce{(K2Cr2O7}\]) solution.
Observation: The solution changes color from orange to green due to the reduction of chromium from \[\ce{Cr^{6+}}\] to \[\ce{Cr^{3+}}\].
\[\ce{SO2 + H2O + K2Cr2O7 + H2SO4 -> Cr2(SO4)3 + K2SO4 + H2O}\]
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संबंधित प्रश्न
Write balanced chemical equations to show The dehydrating property of conc. Sulphuric acid with sugar.
Give appropriate scientific reasons for The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid at a given concentration.
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When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.
Give main difference between drying agent and dehydrating agent.
Copy and complete the following table.
Column 3 has the names of gases to be prepared using the substance you enter in column 1, along with dilute or concentrated sulphuric acid, as indicated in column 2.
| Column 1 | Column 2 | Column 3 |
| Substance reacted with acid | Dilute or concentrated sulphuric acid | Gas |
| Hydrogen | ||
| Carbon dioxide | ||
| Only chlorine |
Write the equation for the laboratory preparation of :
(i) Sodium sulphate using dilute sulphuric acid.
(ii) Lead sulphate using dilute sulphuric acid.
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 :
Dry red rose petals are placed in the jar of sulphur dioxide.
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Write the observation for the following:
Decomposition of bicarbonates by dil. H2SO4
\[\ce{2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + 2CO2}\]
Give two balanced reactions of each type to show the following property of sulphuric acid:
Dehydrating nature
