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प्रश्न
Distinguish by a chemical test sodium chloride and sodium sulphide.
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उत्तर
When diluted sulphuric acid is added to sodium sulphide and heated, hydrogen sulphide gas is produced, which smells like rotten eggs and turns lead acetate paper black.
\[\ce{Na2S + H2SO4 -> H2S ^ + Na2SO4}\]
When concentrated sulphuric acid is exposed to sodium chloride and heated, HCl gas is produced, resulting in dense white vapours when a glass rod dipped in ammonia is brought near it.
\[\ce{NaCl + H2SO4 -> HCl ^ + NaHSO4}\]
संबंधित प्रश्न
Write a balanced equation for the preparation of the following salts:
Copper sulphate from Copper Carbonate.
Write a balanced equation for the preparation of the following salts:
Zinc carbonate from Zinc sulphate
State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
Fill in the following blank:
Rock salt is mined just like ......................
Complete and balance the following chemical equations:
`NaCl + NH_3 + H_2O +CO_2`→
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?
What is a ‘salt’?
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
Distinguish by a chemical test sodium carbonate and sodium sulphite.
Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.
- When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
- The addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black on paper.
- When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
- When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
- The addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.
