HARDMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp -Block Elements (group 15-18)Achiever Section
Pure nitric acid is a colourless liquid, but on exposure to light it turns brownish due to
A.slight decomposition of HNO3 into O2
B.slight decomposition of HNO3 into NO2 and O2✓ Correct
C.the formation of N2O
D.the formation of H3O+ and NO
Explanation
Pure nitric acid is colorless liquid. But on exposure to light it turns brownish because nitric acid is decomposed photo-chemically and turns yellow. The reaction is given below- 3 2 2 2 ( ) O HNO NO H O l -> Hence, the color arises due to slight decomposition of 3 HNO to 2 NO ,which is brown in color. Thus, the correct option is (b) 2 2 Ca [N C N] linear shape (sp-hybridised C-atom) On hydrolysis, calcium cyanamide gets converted into urea which then decomposes into ammonia. 2 2 CN is pseudohalide ion.
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