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Chemistry

Chemistry
When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to

NO2
SO2
N2O
SO3

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Chemistry
The metal compound commonly found in Sindhoor or Kumkum is based on

Lead
Copper
Zinc
Tin

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Chemistry
The percentage of carbon in cost iron is :

0.5 to 1.5
3 to 5
0.01 to 0.25
6 to 8

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Chemistry
An example of replenishable energy source is–

Coal
Biomass
Petroleum
Lignite

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Chemistry
Which type of radiations are absorbed by the upper layer of the atmosphere?

Ultraviolet
Radio-waves
Visible
Infrared

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Chemistry
Who first published the periodic table

Henry Moseley
Dmitri Mendeleev
Julius Lothar Meyer
John Dalton

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