Year: 2016
Topic: Chemistry-Out Of Syllabus
Time :
1.
Which of the following statements about hydrogen is incorrect ?
(1). Hydrogen never acts as cation in ionic salts
(2). Hydronium ion , H
3
O
+
exists freely in solution
(3). Dihydrogen does not act as a reducing agent
(4). Hydrogen has three isotopes of which tritium is the most common