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प्रश्न
What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
ZnSO4
Write a balanced equation for this reaction.
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उत्तर
\[\ce{\underset{\text{Colourless}}{ZnSO4} + 2NaOH -> \underset{\text{white gelatinous ppt.}}{Zn(OH)2↓} + \underset{\text{Colourless}}{Na2SO4}}\]
In excess of alkali , White gelatinous ppt. of Zn(OH)2 becomes soluble :
\[\ce{Zn(OH)2 + 2NaOH(excess) -> \underset{\text{Sodium Zincate (Colourless)}}{Na2ZnO2 + 2H2O}}\]
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संबंधित प्रश्न
Identify the substance underlined, in the following case:
Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide.
Identify the cations in the following case:
NaOH solution, when added to the Solution (A), gives a reddish brown precipitate
Distinguish by adding:
(a) sodium hydroxide solution and
(b) Ammonium hydroxide solution to
(i) Calcium salt solution and lead salt solution
(ii) Lead salt solution and ferrous salt solution
(iii) copper salt solution and ferrous salt solution
(iv) Fe (II) salt solution and Fe (III) Salt solution
(v) Ferrous nitrate and lead nitrate
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Write equation for the reaction that will take place when copper sulphate solution is added to sodium hydroxide solution.
Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution.Describe the effect of Adding sodium hydroxide solution to each portion in turn till it is in excess.
Write the observation, and balanced equation for the following reaction:
Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.
Distinguish by adding:
Sodium hydroxide solution and ammonium hydroxide solution to Fe(II) salt solution and Fe(III) salt solution.
Identify the cation in the following case:
Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.
