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EMRSTIER-II PGT CHEMISTRY

2 days ago | [YT] | 5

Chem fortistgtpgtgdcneetjee

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2 days ago | [YT] | 1

Chem fortistgtpgtgdcneetjee

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5 days ago | [YT] | 1

Chem fortistgtpgtgdcneetjee

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1 week ago | [YT] | 4

Chem fortistgtpgtgdcneetjee

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1 week ago | [YT] | 0

Chem fortistgtpgtgdcneetjee

EMRS Chemistry Mains: Subjective Practice Set
Max Marks: 20 | Time Recommended: 25 Minutes
Q1. Chemical Bonding & Molecular Structure
Compare the bond angles in NH3 PH3 and AsH3 based on VSEPR theory and the concept of Drago’s Rule. Why is there a drastic decrease in bond angle from NH3. 107.8 to PH3 (93.6)
Q2. Coordination Chemistry
Using Crystal Field Theory (CFT), explain why [CoF6]^3-is a high-spin paramagnetic complex, while [Co(CN)6]^3-is a low-spin diamagnetic complex. Calculate the Crystal Field Stabilization Energy (CFSE) for both in terms of 🔼•
Q3. Chemical Kinetics
For a first-order reaction, show that the time required for 99% completion is twice the time required for the completion of 90% of the reaction. Provide the mathematical derivation.
Q4. Organic Chemistry (Reaction Mechanism)
Distinguish between SN1 and SN2 mechanisms based on the following criteria:
Order of reactivity of alkyl halides.
Stereochemical outcome (Inversion vs. Racemization).
Nature of the intermediate/transition state.
Q5. Thermodynamics
Define Gibbs Free Energy (G). Derive the relationship between standard free energy change deltaG^0and the equilibrium constant Kc of a reaction. Under what condition does a non-spontaneous reaction become spontaneous?

Writing Tips by Deepiitd 💡
To score a perfect 4/4 on these questions, students should follow these "Deepiitd" strategic guidelines:
The "Keyword" Rule: Examiners look for specific terms (e.g., Steric hindrance, Synergic bonding, Lone pair-bond pair repulsion). Underline these keywords to make them pop.
Logical Flow (Step-Marking): For numericals or derivations, never jump to the final answer. Start with the formula, then substitution, and finally the result with proper units.

Visual Representation: Even if not asked, draw a small diagram or structure.
Example: For Q2, drawing the splitting of d-orbitals (t2g} and eg. adds instant credibility.
The "Half-Page" Principle: A 4-mark answer should ideally span half to three-quarters of an A4 page. Don't ramble; keep it dense with facts.

Comparison Tables: For "distinguish" questions (like Q4), always use a T-table format. It's much easier to grade than long paragraphs.

1 week ago | [YT] | 6

Chem fortistgtpgtgdcneetjee

Sommerfeld introduced a second quantum number to describe the shape of the orbit. What is this quantum number called today?

1 week ago | [YT] | 3

Chem fortistgtpgtgdcneetjee

In the Sommerfeld model, the electron's orbit around the nucleus is considered to be:

1 week ago | [YT] | 1

Chem fortistgtpgtgdcneetjee

What was the primary limitation of the Bohr model that Sommerfeld sought to address?

1 week ago | [YT] | 0

Chem fortistgtpgtgdcneetjee

Which scientist's hypothesis provided the theoretical justification for Bohr's 'quantization' of orbits?

1 week ago | [YT] | 3