An unknown compound shows instant formation of a blue-green color when subjected to the conditions of a Chromic Acid test, but shows no precipitate formation when subjected to a 2,4-Dinitrophenylhydrazine (DNP) test. Based on these results, what type of compound is the unknown compound

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

It will appear as o2(g) as a reactant 

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

Um i think answer is a