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प्रश्न
What special name is given to substances like aluminium oxide.
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उत्तर
Aluminium oxide reacts with both acids and bases and so it is called an amphoteric oxide.
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संबंधित प्रश्न
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
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?
Name the metal which has been placed at the top of the reactivity series.
Name the metal which has been placed just below copper in the reactivity series.
How would you show that silver is chemically less reactive than copper?
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
How do metals react with hydrogen? Explain with an example.
What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with eater.
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
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?
Name a metal which does not react with cold as well as hot water but reacts with steam.
Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
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?
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
