Which of the following statements is INCORRECT?
(I) Bleaching powder is a pale yellow powder.
(II) Dry NH3 gas turns red litmus blue.
(III) The pH of rainwater is nearly 7.
(IV) The pH of acid rain is nearly 5.6.
1
All of the above statements are correct
2
I), II) and III)
3
Only II)
4
I), II) and IV)