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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
Name the following:
Metals which forms an amphoteric oxide.
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a 'pop' sound.
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Can we keep sodium immersed under water? Why?
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
Name one metal more reactive and another less reactive than hydrogen.
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
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.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
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.
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Write the chemical equation for the following reaction:
Calcium metal reacts with water.
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
