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प्रश्न
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
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उत्तर
(d) calcium
Calcium lies above the other three metals in reactivity series.
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संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
‘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’.
Write the chemical reaction when iron reacts with dilute H2SO4.
Show the formation of Na2O by the transfer of electrons.
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
Why does aluminium not react with water under ordinary conditions?
What is the action of water on magnesium ? Write equation of the chemical reaction involved.
What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
Which non-metal has been placed in the reactivity series of metals?
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
Name a metal which does not react with cold as well as hot water but reacts with steam.
A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
Which one among the following is an acidic oxide?
The substance that will be flattened on beating with a hammer is ______.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
