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The correct answer is B
The fossil of Archaeopteryx represents the evidence of origin of
Which polymer is formed by the copolymerization of phenol and formaldehyde?
Haematite ores is the ore of which metal?
_____ is the movement of chemicals in the upper layers of soil into lower layers or into groundwater by being dissolved in water.
Which of the following is a noble gas ?
Which of the following is the hardest mineral?
The process of converting a solid directly into its vapor is called:
In a compound, the elements are always present in definite proportions by:
The reaction of an aldehyde with Tollens’ reagent results in:
The speed of light with the rise in the temperature of the medium :
