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प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide
पर्याय
True
False
उत्तर
False.
The catalyst used in laboratory preparation of oxygengas from hydrogen peroxide gas is magnesium dioxide.
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संबंधित प्रश्न
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
The diagrams below represents an experiment to show the presence of a component of air.
- State why air is sucked from – outlet ‘B’ and not from outlet “A”
- State why the air is sucked ‘slowly’ from the outlet “B”
- State the observation seen after completion of the experiment.
- State the reason for the above observation seen.
- Name another component which if present in air as a pollutant would have given a similar observation
Complete the statement given below by filling in the blank with the correct word from the words given below
The ______ is a layer which extends up to about 10-50 km. above the earth.
Name the following:
The component of air which is present more in industrial areas.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
The percentage of carbon dioxide in the air is between 0.2 to 0.4%.
Write the percentage of the gases present in air.
Aerated water contains
______ is used as a substitute for compressed air in tyres.
Make sentences using the given set of words.
99%, oxygen, nitrogen, and air, together
