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प्रश्न
You are given samples of three metals − sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
उत्तर
Sodium, magnesium and copper can be arranged based on their reactivity with water. Sodium reacts violently with cold water because it is the most reactive of the three. Magnesium does not react with hot or cold water; it reacts with only steam. Copper does not react even with steam and it is the least reactive of the three.
These three metals can be arranged based on their reactivity with a dilute acid as well. Sodium reacts with dilute hydrochloric acid violently. Magnesium reacts with dilute hydrochloric acid but less rapidly than sodium. Copper is the least reactive and it does not react with dilute hydrochloric acid.
So the order of their decreasing reactivity is sodium > magnesium > copper.
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संबंधित प्रश्न
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.
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Which of the following elements would yield a basic oxide.
Na, S, C, K, H
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Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
Name one metal which displaces copper from copper sulphate solution and one which does not.
Which non-metal has been placed in the reactivity series of metals?
A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr
An element X forms two oxides XO and XO2. The oxide XO has no action on litmus solution but oxide XO2 turns litmus solution red.
(a) What is the nature of oxide XO?
(b) What is the nature of oxide XO2?
(c) Would you call element X a metal or a non-metal? Give reason for your choice.
(d) Can you give an example of element like X?
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?
