Home›MPPSC Forest›State Forest Service Mains Exam›Section 'B': Forestry and General Science›UNIT-06: Chemistry›Acids and bases, pH scale (simple numerical questions), exothermic and endothermic reactions›Which of the following is not a soft base ?

Which of the following is not a soft base ?

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A.S⁻²
B.I⁻
C.CO₃²⁻Correct
D.SCN⁻
Explanation & Solution

Correct Answer: (C) CO₃²⁻

According to the Hard-Soft Acid-Base (HSAB) principle, CO₃²⁻ is classified as a hard base due to its high electronegativity and low polarizability. S⁻², I⁻, and SCN⁻ are classified as soft bases.

हिंदी में प्रश्न एवं आदर्श उत्तर

निम्नलिखित में से कौन-सा मृदु क्षार नहीं है ?

A.S⁻²
B.I⁻
C.CO₃²⁻सही
D.SCN⁻

सही उत्तर: (C) CO₃²⁻

हार्ड-सॉफ्ट एसिड-बेस (HSAB) सिद्धांत के अनुसार, CO₃²⁻ एक कठोर क्षार (hard base) है क्योंकि इसकी विद्युत ऋणात्मकता अधिक और ध्रुवणता कम होती है, जबकि अन्य मृदु क्षार हैं।

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