Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (23.08.2024) Shift-II
Ground water is particularly prone to excessive hardness due to the presence of:
ACalcium and sodium ions
BCalcium and magnesium ions ✓ Correct
CSodium and magnesium ions
DPotassium and calcium ions
Correct answer: (B) Calcium and magnesium ions — Hardness is due to calcium and magnesium ions, so that is the answer.
Explanation
★Hardness is due to calcium and magnesium ions, so that is the answer.
★Water hardness comes from dissolved mineral ions.
★Ground water flows through limestone and other rocks.
★It dissolves calcium and magnesium from these minerals.
★These calcium and magnesium ions make the water hard.
★So excessive hardness is due to calcium and magnesium ions.
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