9th Class Chemistry Past Paper MCQS 2016 Group 1 Test Lahore Board

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Question 1 of 11

which one of the following pair has the same mass:

Paper: 
Lahore Board 2016 Group 1

1 mole of O2 and 1 mole of CO2

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of N2

1 mole of CO and 1 mole of CO2