When oxygen combines with hydrogen, which substance is formed?
A B C D
water vinegar hydrochloric acid hydrogen dioxide
Question: When oxygen combines with hydrogen, which substance is formed?
(A) water
(B) vinegar
(C) hydrochloric acid
(D) hydrogen dioxide

Answer: (A) water
Answer: (D) hydrogen dioxide
Question: When oxygen combines with hydrogen, which substance is formed?
(A) water
(B) vinegar
(C) hydrochloric acid
(D) hydrogen dioxide
Answer: (A) water