Chemical Bonding
Chemical Bonding is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions (2013, 2019, 2021). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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कॅल्शियम ऑक्साईड (CaO) ची स्टेबल् ऑक्टेट मिळविण्यासाठी : In CaO, so as to achieve the stable octate:
Calcium transfers its 2 valence electrons to Oxygen, forming an ionic bond where Calcium achieves a stable octet configuration (noble gas structure).
रेणूमध्ये अणू _________ बलाद्वारे एकत्रित ठेवले जातात.
Atoms in a molecule are held together by chemical bonds formed through electron sharing or transfer.
खालीलपैकी कोणते लुईस आम्ल नाही ? Which of the following is not a Lewis acid?
A Lewis acid is an electron-pair acceptor. Barium chloride (BaCl2) is an ionic compound and acts as a source of chloride ions, not an electron-pair acceptor in the Lewis sense, unlike boron and beryllium halides which have incomplete octets.
खालील दिलेल्या विधानापैकी कोणती विधाने बरोबर आहेत ? Which of the following statements are correct?
(a)HF आणि H₂O ही ध्रुवीय संयुगे आहेत. / HF and H₂O are polar molecules.
(b)CH₄ आणि CO₂ ही ध्रुवीय संयुगे नाहीत. / CH₄ and CO₂ are non-polar molecules.
(c)CO₂ आणि SO₂ ही ध्रुवीय संयुगे नाहीत. / CO₂ and SO₂ are non-polar molecules.
HF and H2O are polar molecules due to significant electronegativity difference and bent/asymmetrical geometry. CH4 and CO2 are non-polar due to symmetrical geometry cancelling dipoles.