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Chemistry

Chemistry
Which one is the most reactive gaseous element

Chlorine
Iodine
Bromine
Flourine

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Chemistry
Main pollutants released from iron and steel industry are

CO, CO2 and SO2
CO2, H2S and NO2
CO2, NO2 and SO3
NO, SO3 and H2S

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Chemistry
The gas that causes suffocation and death when coal or coke is burnt in a closed room is

Carbon monoxide
Ethane
Methane
Carbon di-oxide

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Chemistry
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

5.05 gram
3.05 gram
4.05 gram
2.05 gram

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Chemistry
Which method will be employed to test the hardness of water?

Boiling
Distillation
None of these
Formation of lather with soap

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Chemistry
Mark the compound which possess ionic, covalent and coordinate bonds.

SO2
NH4Cl
SO3
H2O

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