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Describe the Reaction of Potassium with Water. Write the Equation of the Reaction Involved. - Science

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प्रश्न

Describe the reaction of potassium with water. Write the equation of the reaction involved.

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उत्तर

Potassium reacts violently with water to form potassium hydroxide and hydrogen gas. The huge amount of heat evolved in the reaction will immediately burn the hydrogen gas produced in the reaction.
 
    2K(s) + 2H2O → 2KOH(aq) + H2(g) +  HEAT

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पाठ 3: Metals and Non-metals - Exercise 1 [पृष्ठ १३४]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 3 Metals and Non-metals
Exercise 1 | Q 52.1 | पृष्ठ १३४

संबंधित प्रश्‍न

.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen


Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium


‘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 equations for the reactions of iron with steam. 


What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.


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.


Name two metals which form amphoteric oxides.


Name the metal which has been placed at the top of the reactivity series.


Complete and balance the following equation:


Fill in the following blank with suitable word:

The white powder formed when magnesium ribbon burns in oxygen is of ....................


Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.


Which gas is produced when dilute hydrochloric acid is added to a reactive metal?


Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?


Name one metal more reactive and another less reactive than hydrogen.


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 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?


Name a metal which does not react with cold as well as hot water but reacts with steam.


When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?


Write the chemical equation for the following reaction:
Calcium metal reacts with water.


Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?


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