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TIFR Exam Chemistry question paper

Which of the following experimental observations best demonstrate the wave like character of electrons?
(a) the photoelectric effect
(b) The flow of electrons in a metal wire
(c) The diffraction pattern of electrons scattered from a crystalline solid
(d) The deflection of an electron beam by electrical plates

What is the degeneracy of the energy level with n = 6 (n being the principal quantum number) in a hy drogenic
atom or ion?
(a) 16 (b) 9 (c) 36 (d) 25

The speed of a reaction that involves an enzyme increases as
(a) Temperature decreases (b) pH becomes less than optimal
(c) Substrate concentration increases (d) All of the above

Which of the following statements is always true regarding conductors and semi-conductors?
(a) Semi-conductors are half as good as conductors when comparing their electron mobility.
(b) Conductors have large band gaps and semi-conductors have small band gaps.
(c) Conductors and semi-conductors do not conducts electricity at high temperatures.
(d) None of the above statements are true.

The reaction of sodium ethoxide with ethyliodide to form diethyl ether is termed
(a) electrophilic substitution (b) nucleophilic substitution
(c) electrophilic addition (d) radical substitution

Which of the following statements is true regarding amphiphilic molecules?
(a) An amphiphilic molecule consist of both a positive charge and a negative charge.
(b) Amphiphilic molecules show spontaneous aggregation behaviour in any solvent and at all concentra tions.
(c) Amphiphilic molecules are insoluble in water.
(d) Amphiphilic molecules are known to form liquid crystals.


TIFR Exam Chemistry question paper






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