Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is (a) CrO3 (b) Cr2O3 Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is (a) CrO3 (b) Cr2O3 December 5, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related