The following are chemical entities identifiable during qualitative analysis. i. \(SO _{4}{ }^{2-}\) ii. \(H _{3} O\) iii. \(NH _{4}\) iv. \(OH\). Which of them can be detected-by litmus paper?
A. ii & iv only B. ii only C. i & iii only D. iv only
Correct Answer: A
Explanation
The \(H\) is responsible for the ability of some acids to turn blue litmus paper red, the \(OH\) carries the basic character of bases turning red litmus paper blue. Therefore, (ii) and (iv) only are correct
