Advertisements
Advertisements
प्रश्न
State the precautions while preparing oxygen in the labo-ratory.
उत्तर
The various precautions are :
- Donot collect the first-few bubbles of the gas produced as it is the air in the delivery tube which is driven out
- Method of collection of gas should be appropriate Arundeep’s M.S. Chemistry-7th 126
- Keep all inflammable and bummg apparatus away as oxygen is j a supporter of conbustion.
APPEARS IN
संबंधित प्रश्न
The most abundant element in the earth’s crust.
What is the role of manganese dioxide in the preparation of oxygen?
Fill in the blank space by choosing the correct word from the given list.
List: sulphurous, nitric acid, red lead oxide paint, oxygen, phosphoric
The nitric oxide gas reacts with the oxygen and water vapour to form ______ vapour.
Statement given below is incorrect. Write the correct statement :
Oxygen is prepared in laboratory by treating hydrogen oxide with manganese dioxide.
Statement given below is incorrect. Write the correct statement :
Calcium burns in oxygen with a golden-yellow flame.
Statement given below is incorrect. Write the correct statement :
The oxygen gas turns moist blue litmus red.
Tick (√ ) the most appropriate answer.
When sulphur burns in oxygen, the colour of the flame is :
(a) Starting from hydrogen peroxide how is oxygen gas prepared in laboratory?
(b) What is the function of manganese dioxide?
(c) Write fully balanced equation for the liberation of oxygen from hydrogen peroxide.
(d) Why is the above method preferred to any other method?
Write fully balanced equation for the following :
Na2O + H2O →
Give reason for the following:
Oxidation of sulphur results in a product which turns moist blue litmus red.
