Question

Which of the following elements will produce an oxide that will dissolve in water to form an acid?
A. carbon
B. calcium
C. chromium
D. copper

Answer 1

Answer:

carbon..............

Answer 2

A. carbon

Explanation:

Carbon burns in oxygen to form carbon dioxide. When the oxygen supply is restricted, combustion is incomplete and it forms carbon monoxide. We know that acidic oxides of non-metals turn the blue litmus paper to red. Carbon dioxide when dissolved in water forms carbonic acid. So the aqueous solution of the oxide turns blue litmus paper red.  

Option A is the answer.