Which gas is odourless?

Name the gas which is colourless, odourless, tasteless, combustible, lighter than air and insoluble in water.

Opioids are the drugs which bind to specific opioid receptors present in our CNS and GIT. Heroin, commonly called smack is chemically......., which is white, odourless, bitter crystalline compound, obtained by........of morphine ?

Opioids are the drugs which bind to specific opioid receptors present in our CNS and GIT. Heroin, commonly called smack is chemically......., which is white, odourless, bitter crystalline compound, obtained by........of morphine ?

Which noble gas is found in natural gas ?

Which gas has more percentage in coal gas ?

Why is carbon monoxide a pollutant although it is a colourless and odourless gas?