Advertisements
Advertisements
प्रश्न
Why is sodium kept immersed in kerosene oil?
Give reason:
Sodium, potassium and lithium are stored under oil.
Sodium metal is stored under kerosene oil, Why?
उत्तर १
Sodium is highly reactive and reacts with both air and water. When exposed to air, it quickly combines with oxygen to form its oxide. Similarly, it reacts with water or moisture to produce sodium hydroxide.
\[\ce{4Na_{(s)} + O2_{(g)} -> 3Na2O_{(s)}}\]
\[\ce{2Na_{(s)}\underset{or moisture}{+ 2H2O_{(l)}} -> 2NaOH_{(aq)} + H2_{(g)}}\]
To protect sodium metal, it is typically stored under kerosene to prevent contact with air or moisture.
उत्तर २
- Sodium, potassium, and lithium are very reactive metals that react vigorously with air and water. Therefore, they are kept immersed in kerosene oil to prevent their contact with air and moisture.
- Sodium metal is highly reactive. Moisture in the air forms sodium hydroxide and releases hydrogen, which releases a significant amount of heat, resulting in fire.
APPEARS IN
संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Write equation for the reaction of sodium with oxygen.
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Complete and balance the following equation:
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
How do non-metals react with hydrogen? Explain with an example.
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 another metal oxide which behaves like aluminium oxide.
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?
Name one metal which displaces copper from copper sulphate solution and one which does not.
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
Write the name and formula of a molecule made up of three atoms of oxygen.
Choose the correct alternative and rewrite the following:
Reaction of iron nails whith copper sulphate solution is an example of _____________________
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
A cable manufacturing unit tested few elements on the basisof their physical properties.
| Properties | W | X | Y | Z |
| Malleable | Yes | No | No | Yes |
| Ductile | Yes | No | No | Yes |
| Electrical conductivity | Yes | Yes | Yes | No |
| Melting Point | High | Low | Low | High |
Which of the above elements were dicarded for usage by the company?
