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प्रश्न
What are the two necessary conditions for rusting of iron?
उत्तर
Conditions for rusting:
- Presence of moisture (water).
- Presence of oxygen (air).
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संबंधित प्रश्न
“Air is a mixture”. Support this statement citing at least three evidences.
Tick (√) the most appropriate answer.
The humans pollute the air by :
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
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 main, rare (inert) gas present in air.
______ is the main component of air.
When cooled to -57°C, gaseous carbon-di-oxide becomes a liquid.
______ exists in nature as silicates, carbonates, oxides, and water. It also exists in a free state as part of the air in the atmosphere.
Which of the following components of air is present in the largest amount in the atmosphere?
