AP EAMCET20224 Jul 2022Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual
Assertion (A): HCl gas is dried by passing through concentrated H 2 SO 4 . Reason (R): HCl gas reacts with NH 3 that gives white fumes
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is not the correct explanation of (A)
- C(A) Is correct but (R) is incorrect
- D(A) Is incorrect but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is not the correct explanation of (A)
Step-by-step solution
In laboratory, HCl is prepared by heating sodium chloride with concentrated sulphuric acid. NaCl   +   H 2 SO 4 → 420 K     NaHSO 4 + HCl   NaHSO 4   +   NaCl   → 823 K     Na 2 SO 4 + HCl HCl gas can be dried by passing through concentrated sulphuric acid as concentrated sulphuric acid being hygroscopic in nature as it absorbs moisture from the air and gets diluted and acts as a drying agent. It has a strong affinity for water and thus it absorbs water