Which metal nitrate gives colourless gas on thermal decomposition?? (a) NaNo3 (b) Cu(NO3)2 (c) Ba(NO3)2 (d) Hg(NO3)2 Somebody help me

Which metal nitrate gives colourless gas on thermal decomposition??

1.	Which metal nitrate gives colourless gas on thermal decomposition?? (a) NaNo3 (b) Cu(NO3)2 (c) Ba(NO3)2 (d) Hg(NO3)2 Somebody help me
Answer» SWER is (B) CU(NO³) THANK you