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प्रश्न
Distinguish by a chemical test sodium carbonate and sodium sulphite.
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उत्तर
Sodium chloride reacts with H2SO4 to produce HCl gas, while sodium sulphite reacts with H2SO4 to produce sulphur dioxide gas.
\[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]
Sodium sulphite when added to a dilute solution. Sulphuric acid releases a colourless gas with a burning sulphur odour and changes acidified potassium dichromate paper from orange to green.
\[\ce{Na2SO3 + H2SO4 -> Na2SO4 + H2O + SO2}\]
\[\ce{\underset{(Orange)}{K2Cr2O7} + 3SO2 + H2SO4 -> K2SO4 + \underset{(Green)}{Cr2(SO4)3} + H2O}\]
संबंधित प्रश्न
State one relevant observation for the following:
Anhydrous calcium chloride is exposed to air for some time.
Name the major salt present in sea-water.
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
(a) potassium sulphate
(b) sodium sulphate
(c) sodium chloride
(d) potassium carbonate
When the concentrated aqueous solution of substance X is electrolysed, then NaOH, Cl2 and H2 are produced. Name the substance X. What is the special name of this process?
You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.
(A) NaCl; Na2SO4; KCl
(B) NaCl; CaCl2; KCl
(C) CaCl2; CaSO4; MgSO4
(D) Na2SO4; CaSO4; MgSO4
Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.
|
(1) |
Calcium Sulphate |
(2) |
Sodium Sulphate |
|
(3) |
Calcium Chloride |
(4) |
Potassium Sulphate |
|
(5) |
Sodium Hydrogen Carbonate |
(6) |
Magnesium Chloride |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
Name gases which has a sour taste.
Acids react with metallic oxides to produce ______.
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Ferric chloride
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
