Advertisements
Advertisements
Question
Why is white phosphorus kept immersed under water?
Advertisements
Solution
White phosphorus is kept immersed in water because it spontaneously ignites when exposed to air. But it does not react with water.
APPEARS IN
RELATED QUESTIONS
.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Write equations for the reactions of iron with steam.
Show the formation of Na2O by the transfer of electrons.
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
Why are metals called electropositive elements?
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Which of the following elements would yield an acidic oxide?
Na, S, C, K, H
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
You are given samples of three metals − sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
Name one metal which displaces copper from copper sulphate solution and one which does not.
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?
If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?
Name a metal which It does not react with any physical state of water?
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Tungsten wire is used in electric bulbs.
Why is acidified water considered to be a good conductor of electricity?
