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प्रश्न
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
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उत्तर
When a strip of zinc metal is placed in a copper sulphate solution, zinc sulphate solution and copper are formed.
\[\ce{\underset{(Blue solution)}{\underset{Copper sulphate}{CuSO4_{(aq)}}} + \underset{(Silvery white)}{\underset{Zinc}{Zn_{(s)}}} -> \underset{(Colourless solution)}{\underset{Zinc sulphate}{ZnSO4_{(aq)}}} + \underset{(Red-brown)}{\underset{Copper}{Cu_{(s)}}}}\]
In this reaction, zinc displaces copper from copper sulphate, liberating copper. The blue colour of copper sulphate solution diminishes due to the production of colourless zinc sulphate. A red-brown deposit of copper metal forms on the zinc strip. This displacement reaction occurs because zinc is more reactive than copper.
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संबंधित प्रश्न
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron (II) sulphate | Cooper (II) sulphate | Zinc sulphate | Silver nitrate |
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals A, B, C and D.
- Which is the most reactive metal?
- What would you observe if B is added to a solution of copper (II) sulphate?
- Arrange the metals A, B, C and D in the order of decreasing reactivity.
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
Can we keep sodium immersed under water? Why?
You are given samples of three metals − sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
Write the equation for the reaction of Zinc with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
Name one metal which displaces copper from copper sulphate solution and one which does not.
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag
In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?
Write the chemical equation of the above process.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
Which one among the following is an acidic oxide?
A cable manufacturing unit tested few elements on the basisof their physical properties.
| Properties | W | X | Y | Z |
| Malleable | Yes | No | No | Yes |
| Ductile | Yes | No | No | Yes |
| Electrical conductivity | Yes | Yes | Yes | No |
| Melting Point | High | Low | Low | High |
Which of the above elements were dicarded for usage by the company?
The substance that will be flattened on beating with a hammer is ______.
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
