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प्रश्न
The least reactive metal among the following is:
विकल्प
sodium
silver
copper
lead
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उत्तर
Silver
Explanation:
According to the metal reactivity series, the reactivity of these elements decreases in the order of Sodium > Lead > Copper > Silver. Silver is placed near the very bottom of the series because its stable electron configuration makes it highly resistant to oxidation and corrosion. Consequently, it is a noble metal that does not readily lose electrons or react with water and acids compared to the other options
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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.
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
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.
Name the metal which has been placed at the bottom of the reactivity series.
Name the metal which has been placed just below copper in the reactivity series.
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
How do metals react with hydrogen? Explain with an example.
Why is white phosphorus kept immersed under water?
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
What is the action of water on sodium? Write the equation of the chemical reactions involved.
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be ______.
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
- What is the nature of oxide A2O3?
- What is the nature of oxide BO?
- Name one metal like A.
- Name one metal like B.
Which of the following reactions will not occur? Why not?
- \[\ce{MgSO4_{(aq)} + Cu_{(s)} -> CuSO4_{(aq)} + Mg_{(s)}}\]
- \[\ce{CuSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Cu_{(s)}}\]
- \[\ce{MgSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Mg_{(s)}}\]
Name a metal for the given case:
It does not react with cold as well as hot water but reacts with steam.
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
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
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
