Chemistry S & P Block Elements UHS 2023
PMDC Verified Question 28 of 104
All alkali metals react with chlorine gas to form white metal chlorides salt. The metal chlorides salt formed is:
A
Insoluble
B
Soluble in water to give neutral solution of pH 7
C
Soluble in water to give acidic solution of pH 1
D
Soluble in water to give alkaline solution of pH 14
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Soluble in water to give neutral solution of pH 7
Concept:

The pH of a salt solution depends on whether it is formed from strong/weak acids and bases.

Solution:

  • Alkali metals react with Chlorine to form ionic salts (e.g., \( \text{NaCl} \), \( \text{KCl} \)).
  • These alkali metal chlorides are highly soluble in water.
  • When they dissolve, they dissociate into ions (e.g., \( \text{Na}^+ \) and \( \text{Cl}^- \)).
  • \( \text{Na}^+ \) is the conjugate acid of a strong base (NaOH), and \( \text{Cl}^- \) is the conjugate base of a strong acid (HCl). Therefore, neither ion undergoes hydrolysis (they do not react with water to produce excess \( \text{H}^+ \) or \( \text{OH}^- \)).
  • As a result, the solution remains perfectly neutral with a pH of 7.


Why other options are incorrect:

  • Alkali metal chlorides do not form acidic or basic solutions because they do not hydrolyze water. They are practically universally soluble, not insoluble.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

Previous Question All S & P Block Elements MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App