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Which of the following is a chemical change?
1 Rusting of iron
2 Tempering of iron
3 Melting of iron
4 Bending of iron
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In which of the following processes, is vanadium pent oxide used as a catalyst? 1 Contact process 2 Haber’s process 3 Solvay process 4 None of these
The combustible material at the tip of a safety match sitck is 1 Sulphur 2 Manganese dioxide 3 Phosphorus 4 Antimony sulphide
Which comet collided with jupiter?
Who is the second female cosmonaut?
Galvanized iron sheets have a coating of 1 Tin lead 2 Zinc 3 Chromium 4 Lead
what are advantages of excess populatoin?
What are reflecting nebulae?
The metal that is present in photo films is 1 Mercury 2 Platimnum 3 Magnesium 4 Silver
A team of u.n scientists visited thumba?
The average salinity of sea water is 1 2% 2 2.5% 3 3% 4 3.5%
Label the following types of erosion in order by their ability to transport materials. Wind erosion, water erosion, glacial erosion, plant/animal erosion.
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Biological Sciences 
