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प्रश्न
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Give reasons for the following:
To make hot water tanks, copper is used and not steel.
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उत्तर १
- Copper is a good conductor of heat and does not react with hot water; on the contrary, iron reacts with hot water.
- Iron reacts with steam to corrode the tank, whereas copper does not react with either of these substances.
- Steam has an effect on iron, while temperature fluctuations have no effect on copper.
- When hot water produces steam, iron reacts with it in the following forms:
\[\ce{\underset{Iron}{3Fe} + \underset{Water}{4H2O} -> \underset{Ferric oxide}{Fe3O4} + \underset{Hydrogen gas}{4H2↑}}\]
Therefore, copper rather than steel is used to make hot water tanks.
उत्तर २
Copper is less reactive and a better conductor of heat. It does not corrode easily, making it suitable for hot water tanks. Hence, copper is used to make hot water tanks.
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.
Show the formation of Na2O by the transfer of electrons.
Differentiate between metal and non-metal on the basis of their chemical properties.
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Fill in the following blank with suitable word:
Magnesium liberates ............... gas on reacting with hot boiling water.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
Why is white phosphorus kept immersed under water?
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Write the equation for the reaction of Magnesium with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
You are given a solution of AgNO3. Which of the following do you think cannot displace Ag from AgNO3solution?
(a) Magnesium
(b) Zinc
(c) Gold
(d) Copper
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
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.
What is the characteristic of the electronic configuration of noble gases?
Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
Which one among the following is an acidic oxide?
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
- Good thermal conductivity
- Good electrical conductivity
- Ductility
- High melting point
The substance that will be flattened on beating with a hammer is ______.
