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प्रश्न
What is observed when hot, concentrated caustic soda solution is added to zinc? Write a balanced equation.
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उत्तर
\[\ce{Zn + \underset{concentrated}{\underset{Hot and}{2NaOH}}-> \underset{(colourless)}{\underset{Sodium zincate}{Na2ZnO2}} + H2\uparrow}\]
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संबंधित प्रश्न
Identify the cations in the following case:
NaOH solution, when added to the Solution (A), gives a reddish brown precipitate
Name the kind of particles present in sodium hydroxide solution.
Using sodium hydroxide solution, how will you distinguish: Zinc nitrate solution from calcium nitrate solution
Using sodium hydroxide solution, how will you distinguish:
Lead hydroxide from magnesium hydroxide.
Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of
- adding sodium hydroxide solution to each portion in turn till it is in excess.
- adding ammonium hydroxide to each portion in turn till it is in excess.
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 |
State your observation of the following case :
When excess sodium hydroxide is added to calcium nitrate solution
Distinguish by adding:
Sodium hydroxide solution and ammonium hydroxide solution to calcium salt solution and lead salt solution.
A student was asked to perform an experiment in the laboratory based on the instructions given:
Observe the picture given below and state one observation for the experiment you would notice on mixing the given solution.
Name the metal hydroxides which are insoluble in caustic soda solution.
