Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Single Correct MCQ
Published on: August 13, 2026

A pungent smelling gas X after being dried by concentrated H 2 SO 4 was dissolved in water to give strongly acidic solution. The gas also gives dense white fumes with NH 3 . X is also a constituent of aqua-regia. Which of the following is/are true for X ?

A
X is HCl
B
X is Cl 2
C
X is the most volatile among the hydrides of halogens
D
Solution of X in water can liberate CO 2 from the solution of sodium hydrogencarbonates

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The correct answer is:
CHECK THE SOLUTION.

(a,c,d) X is HCl.

HCl has lowest boiling point used is the most volatile.

X + NaHCO 3 ⎯→ NaCl + H 2 O | CO 2

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