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प्रश्न
With the help of examples, describe how metal oxides differ from non-metal oxides.
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उत्तर
Metal oxides are generally basic in nature, which can turn red litmus solution to blue while non-metal oxides are generally acidic in nature, which can turn blue litmus solution to red. For example, sodium oxide and potassium oxide are metal oxides which are basic in nature; carbon dioxide and sulphur dioxide are non-metal oxides which are acidic in nature.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
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.
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a 'pop' sound.
From amongst the metals sodium, calcium aluminium, copper and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Which of the two metals is more reactive: copper or silver?
Write equation for the reaction of sodium with oxygen.
Complete and balance the following equation:
Na + O2 →
Complete and balance the following equation:
Cu (NO3)2 (aq) + Zn(s) →
How do metals react with hydrogen? Explain with an example.
Why is white phosphorus kept immersed under water?
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
A metal less reactive and another metal more reactive than hydrogen are:
(a) aluminium and lead
(b) iron and magnesium
(c) copper and tin
(d) copper and mercury
Which of the following reactions will not occur? Why not?
(a) MgSO4 (aq) + Cu (s) → CuSO4 (aq) + Mg (s)
(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)
Name a metal which does not react with cold as well as hot water but reacts with steam.
Name a metal which It does not react with any physical state of water?
Why is acidified water considered to be a good conductor of electricity?
