Which of the following is not a greenhouse gas?

One of the following is not a greenhouse gas

Which one of the following is not a green house gas?

Which of the following is green house gas?

Which of the following is a coloured gas ?

Equal volumes of oxygen gas and a second gas weigh 1.00 and 2.375 grams respectively under the same experimental conditions. Which of the following is the unknown gas?

Which of the following oxides of nitrogen is called laughing gas ?

Which one of the following pairs of gases are the major cause of "Greenhouse effect?