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प्रश्न
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.
उत्तर
Calcium ions (Ca2+)
\[\ce{Ca^{2+} + 2NaOH -> Ca(OH)2 + 2Na}\]
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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
What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
FeCl3
Write a balanced equation for this reaction.
What do you observe when caustic soda solution is added to the following solution, first a little and then in excess:
Pb(NO3)2
Write balanced equation for this reaction.
Name a yellow monoxide that dissolves in hot and concentrated caustic alkali.
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.
Identify the substance Q based on the information given below:
The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.
| List X | List Y |
| (i) Pb2+ | (A) Reddish Brown |
| (ii) Fe2+ | (B) White insoluble inexcess |
| (iii) Zn2+ | (C) Dirty green |
| (iv) Fe3+ | (D) White soluble in excess |
| (v) Cu2+ | (E) White soluble in excess |
| (vi) Ca2+ | (F) Blue |
Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:
Name the metal hydroxides which are insoluble in caustic soda solution.
