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What is efflorescence? Give an example?

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It is the process of deposition of salt over the surface which was either present on water or the material. Exp. White spots present in bricks.
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Why paper catches fire when a convex lens is used to ficus sunlight?
covex lens concentrate the sun rays onto a small area, which heats up the area, then the exposed surface will ignited, {it is a converging lengs, that is it will converge the rays falling on it into single strong beam.
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A wire is 1m long, 0.2mm in diameter and has resistance of 10?. Calculate its resistivity.
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What is the formulae of Photosynthesis 

Photosynthesis is a process where green plants use light energy CO2 and water to produce glucose oxygen and water. 6CO2+6H2O--- C6H12O6 +6O2 +6H2O
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What is the highest melting point of TUNGSTEN?

Tungsten has high melting point of about 3400°C. It offers high resistivity also
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