Chemistry Pre-Board Exam Prep
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chemistry paper
Sample questions with model answers
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Explain the concept of crystal field splitting in an octahedral complex. Draw a diagram showing the splitting of d-orbitals.
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In an octahedral complex, d-orbitals split into two sets: lower energy t$_{2g}$ and higher energy e$_g$ due to the approach of ligands.
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Of the d⁴ species, Cr²⁺ is strongly reducing while Mn³⁺ is strongly oxidizing. Why?
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Cr²⁺ has a higher tendency to lose electrons due to its half-filled d-orbital configuration, while Mn³⁺ has a strong tendency to gain electrons to achieve stability.
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45g of ethylene glycol (C$_2$H$_6$O$_2$) is mixed with 600g of water. Calculate the Freezing point depression (ΔT_f) of solution. K_f (Molal depression constant = 1.86 K Kg mol⁻¹).
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ΔT_f = 2.49 K
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Write IUPAC names of the following compounds: i. K$_3$[Al(ox)$_3$]³⁻ ii. [Pt(en)Cl$_2$] iii. [Cr(NH$_3$)$_3$Cl$_3$].
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i. Potassium tris(oxalato)aluminate(III); ii. Bis(ethylenediamine)platinum(II) dichloride; iii. Tris(ammine)chromium(III) chloride.
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