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प्रश्न
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
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उत्तर
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called rust.
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संबंधित प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
Tick (√) the most appropriate answer.
The humans pollute the air by :
Write ‘true’ or ‘false for the following;
The composition of air was discovered by Lavoisier.
Analogy
Photosynthesis : _____ :: Respiration : Oxygen
How do the roots of land plants get oxygen for breathing?
Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off the fire?
Which of the following is true about oxygen?
Write a note on nitrogen.
“Air is not an elementary substance, but a composition”. Why?
Nitrogen is an essential element present in proteins and nucleic acids which are the building blocks of living things.
