Name: Thoroughly Revised and Enlarged Edition Chemistry MSc Entrance Examination for All Indian Universities
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Thoroughly Revised and Enlarged Edition Chemistry MSc Entrance Examination for All Indian Universities

by Madhurima

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Q1

Which theory explains both magnetic and optical properties of coordination compounds?

A1

Crystal Field Theory (CFT); it accounts for d-orbital splitting, colour, and magnetic behaviour.
Q2

What is the basicity order of ammonia, methylamine, and aniline in aqueous medium?

A2

Methylamine > Ammonia > Aniline; +I effect of methyl increases basicity; aniline has -M effect.
Q3

Define enantiomeric excess and its formula.

A3

Enantiomeric excess = % of major enantiomer – % of minor enantiomer = observed specific rotation/actual specific rotation ×100.
Q4

Why is nitrobenzene meta-directing in electrophilic aromatic substitution?

A4

NO₂ group withdraws electrons by -I and -M, deactivating ortho/para positions via destabilizing intermediates.
Q5

Write the Nernst equation for a half-cell reaction.

A5

E = E° – (RT/nF) ln Q, where Q = product/reactant ratio; at 298K, E = E° – (0.059/n) log Q.
Q6

What is the difference between order and molecularity of a reaction?

A6

Order is experimental sum of concentration exponents; molecularity is theoretical number of molecules colliding in elementary step.
Q7

Why do transition elements show variable oxidation states?

A7

Due to small energy difference between (n-1)d and ns orbitals, allowing participation of both in bonding.
Q8

How does the lanthanoid contraction affect post-lanthanoid elements?

A8

It causes nearly identical radii of Zr/Hf, Nb/Ta, Mo/W, leading to similar chemical properties and difficult separation.
Q9

Distinguish between type-I and type-II colloids.

A9

Type-I (lyophilic) are solvent-loving, reversible; type-II (lyophobic) are solvent-hating, irreversible, need stabilizers.
Q10

What is the difference between homotopic and enantiotopic protons in NMR?

A10

Homotopic protons are chemically equivalent; enantiotopic protons give same NMR signal but in chiral environment split.

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Have Doubts Regarding This Product ? Ask Your Question

Q1

Which theory explains both magnetic and optical properties of coordination compounds?

A1

Crystal Field Theory (CFT); it accounts for d-orbital splitting, colour, and magnetic behaviour.
Q2

What is the basicity order of ammonia, methylamine, and aniline in aqueous medium?

A2

Methylamine > Ammonia > Aniline; +I effect of methyl increases basicity; aniline has -M effect.
Q3

Define enantiomeric excess and its formula.

A3

Enantiomeric excess = % of major enantiomer – % of minor enantiomer = observed specific rotation/actual specific rotation ×100.
Q4

Why is nitrobenzene meta-directing in electrophilic aromatic substitution?

A4

NO₂ group withdraws electrons by -I and -M, deactivating ortho/para positions via destabilizing intermediates.
Q5

Write the Nernst equation for a half-cell reaction.

A5

E = E° – (RT/nF) ln Q, where Q = product/reactant ratio; at 298K, E = E° – (0.059/n) log Q.
Q6

What is the difference between order and molecularity of a reaction?

A6

Order is experimental sum of concentration exponents; molecularity is theoretical number of molecules colliding in elementary step.
Q7

Why do transition elements show variable oxidation states?

A7

Due to small energy difference between (n-1)d and ns orbitals, allowing participation of both in bonding.
Q8

How does the lanthanoid contraction affect post-lanthanoid elements?

A8

It causes nearly identical radii of Zr/Hf, Nb/Ta, Mo/W, leading to similar chemical properties and difficult separation.
Q9

Distinguish between type-I and type-II colloids.

A9

Type-I (lyophilic) are solvent-loving, reversible; type-II (lyophobic) are solvent-hating, irreversible, need stabilizers.
Q10

What is the difference between homotopic and enantiotopic protons in NMR?

A10

Homotopic protons are chemically equivalent; enantiotopic protons give same NMR signal but in chiral environment split.

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