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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.
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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 react with hot water to form magnesium hydroxide and hydrogen gas. It reacts with steam even more vigorously to form magnesium oxide.
- Copper does not react even with steam, and it is the least reactive of the three.
Sodium, magnesium and copper 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
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Name two metals which cannot displace hydrogen from dilute acids.
Can we keep sodium immersed under water? Why?
Write the equation for the reaction of:
Zinc with dilute hydrochloric acid.
Name the products formed in the given case. Also indicate the physical states of all the substances involved.
Name one metal more reactive than hydrogen.
One of the following is not a neutral oxide. This is:
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be ______.
An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be ______.
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 ______.
In a solution of lead acetate, a strip of metal M was dipped. After some time, lead from the solution was deposited on the metal strip. Which metal is more reactive, M or lead?
\[\ce{CuSO4_{(aq)} + Fe_{(s)} -> FeSO4_{(aq)} + Cu_{(s)}}\]
\[\ce{FeSO4_{(aq)} + Zn_{(s)} -> ZnSO4_{(aq)} + Fe_{(s)}}\]
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
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?
Write the chemical equation for the following reaction:
Calcium metal reacts with water.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
Find the odd one out:
Why is acidified water considered to be a good conductor of electricity?
