Advertisements
Advertisements
प्रश्न
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Advertisements
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
APPEARS IN
संबंधित प्रश्न
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
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.
Name two metals which form amphoteric oxides.
Name the metal which has been placed just below copper in the reactivity series.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Complete and balance the following equation:
Na2O + H2O →
With the help of examples, describe how metal oxides differ from non-metal oxides.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.
What is the action of water on aluminium ? Write equation of the chemical reaction involved.
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with eater.
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?
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
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.
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
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?
