PMS 2019 Ministerial Quota, Everyday Science MCQs, PPSC Solved Past Papers MCQsLaughing gas is called? Posted on April 12, 2021 by Rana TahirA. Carbon dioxide B. Nitrous oxide C. Oxygen D. HydrogenShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)