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MDCAT
Chemistry
2018

Chemistry · Environmental Chemistry

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question
Which of the following gas, when ignited, burns with a blue flame and is not very soluble in water?
Options
  • A
    O2
  • B
    CO2
  • C
    N2
  • D
    He
Explanation

Firstly we should be clear that each gas has a specific type of flame depending on the nature of combustion and the products formed and so does all these gases which are given in the option. Nitrogen when ignited in the presence of oxygen it forms various oxides of nitrogen like NO, NO2 and burns with a blue flame.

O2 does not burn with blue flame. It is partially soluble in water.

CO2 burns with blue flame but is highly soluble in water.

Firstly we should be clear that each gas has a specific type of flame depending on the nature of combustion and the products formed and so does all these gases which are given in the option. Nitrogen when ignited in the presence of oxygen it forms various oxides of nitrogen like NO, NO2 burns with a blue flame.

He burns with pinkish orange flame and is insoluble in water.

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Tagged under Chemistry · Environmental Chemistry · 2018