CSIR Chemical Sciences: Questions 253 - 255 of 329

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Question number: 253

» Physical Chemistry » Principles of Quantum Mechanics » Orbital and Spin Angular Momenta

Appeared in Year: 2014

MCQ▾

Question

Simple Huckel molecular orbital theory, (June)

Choices

Choice (4) Response
a.

Considers ee repulsion

b.

Distinguishes cis-butadiene and cyclobutadine.

c.

Distinguishes cis-butadiene and trans-butadiene.

d.

Has different coulomb integrals for non-equivalent carbons.

Question number: 254

» Physical Chemistry » Principles of Quantum Mechanics » Tunneling

Appeared in Year: 2014

MCQ▾

Question

A quantum particle with fixed initial energy E0<v is allowed to strike four barrier. The transmission Probability is maximum in (Dec)

Choices

Choice (4) Response
a.
Maximum transmission probability is in: Choice A

Maximum Transmission Probability Is in: Choice A

Maximum transmission probability is in

b.
Maximum transmission probability is in: Choice B

Maximum Transmission Probability Is in: Choice B

Maximum transmission probability is in

c.
Maximum transmission probability is in: Choice C

Maximum Transmission Probability Is in: Choice C

Maximum transmission probability is in

d. Question does not provide sufficient data or is vague

Question number: 255

» Physical Chemistry » Principles of Quantum Mechanics » Harmonic Oscillator and the Hydrogen Atom

Appeared in Year: 2013

MCQ▾

Question

Quantum mechanical virial theorem for a general potential v(x,y,z) is given by <xδvδx+yδvdy+zδvδz>=2<T>, where T is kinetic energy operator and < > indicates expectation value. This leads to following relation between expectation value of kinetic energy and potential energy for a quantum mechanical harmonic oscillator with potential v=12kxx2+12kyy2+12kzz2 (Dec)

Choices

Choice (4) Response
a.

<T>=<V>

b.

<T>=12<V>

c.

<T>=<V>

d.

<T>=12<V>

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