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प्रश्न
Fill in the following blank with suitable word:
Magnesium liberates ............... gas on reacting with hot boiling water.
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उत्तर
Magnesium liberates hydrogen gas on reacting with hot boiling water.
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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.
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
What name is given to those metal oxides which show basic as well as acidic behaviour?
Name the metal which has been placed at the top of the reactivity series.
Write equation for the reaction of magnesium with oxygen.
Complete and balance the following equation:
Na + O2 →
Complete and balance the following equation:
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 a basic oxide.
Na, S, C, K, H
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
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 a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
Name one metal which displaces silver from silver nitrate solution and one which does not.
The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
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 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
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?
Name a metal which does not react with cold as well as hot water but reacts with steam.
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
