Q: Which one of the following materials is present in a guard tube (drying tube) that is used for preparation of HCl gas?
(a)Calcium chloride
(b)Calcium bromide
(c)Calcium iodide
(d)Calcium fluoride
Correct Answer: (a)
The correct answer is (d) 'कैल्शियम फ्लुओराइड'. This question from the General Studies domain tests knowledge of Miscellaneous.