Advertisements
Advertisements
प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
The substance which accelerates the speed of a reaction without itself undergoing any change is called
पर्याय
catalyst
pollutant
fuel
none of the above
Advertisements
उत्तर
catalyst
APPEARS IN
संबंधित प्रश्न
Name two important processes supported by oxygen present in air.
How is air useful to water boats?
What is air pollution?
Fill in the blank
Polluted air is harmful to ____.
Write ‘true’ or ‘false for the following;
Air is a compound.
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
State what do you understand by the term ‘air’. Explain its importance to mankind.
Water does not have a ______ but has definite ______ and ______.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
