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प्रश्न
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
Write a balanced equation for the reaction of the following:
Calcium with water
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उत्तर
When calcium reacts with water, it forms calcium hydroxide and hydrogen gas. Due to the formation of hydrogen bubbles that stick to the surface of calcium, it starts floating on water.
\[\ce{Ca_{(s)} + 2H2O_{(l)} -> Ca(OH)2_{(aq)} + H2_{(g)}}\]
Notes
Students should refer to the answer according to their questions.
संबंधित प्रश्न
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
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Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
Name two metals which cannot displace hydrogen from dilute acids.
What is the action of water on sodium ? Write equation of the chemical reaction involved.
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
Which non-metal has been placed in the reactivity series of metals?
You are given a solution of AgNO3. Which of the following do you think cannot displace Ag from AgNO3solution?
(a) Magnesium
(b) Zinc
(c) Gold
(d) Copper
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
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
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
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?
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
