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प्रश्न
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
What happens when iron nails are put into copper sulphate solution?
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उत्तर १
`An iron nail displaces copper from a copper sulphate solution to form a ferrous sulphate solution, due to which the blue colour of the copper sulphate solution fades. Also, copper is deposited on the iron nail, which turns it reddish-brown in colour.
उत्तर २
When iron nails are put into copper sulphate solution, the blue colour of copper sulphate fades gradually to green due to the formation of ferrous sulphate and the reddish-brown copper metal is deposited on the iron nails.
CuSO4(aq) + Fe(s) → FeSO4(aq) + Cu(s)
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संबंधित प्रश्न
Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.
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.
Differentiate between metal and non-metal on the basis of their chemical properties.
Name the metal which has been placed just below copper in the reactivity series.
Which of the two metals is more reactive: copper or silver?
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Fill in the following blank with suitable word:
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
Can we keep sodium immersed under water? Why?
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
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.
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
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 name and formula of a molecule made up of three atoms of oxygen.
Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
