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1

AIPMT 2010 Mains

MCQ (Single Correct Answer)
Some statements about heavy water are given below:
(i)  Heavy water is used as a moderator in nuclear reactors.
(ii)  Heavy water is more associated than ordinary water.
(iii)  Heavy water is more effective solvent than ordinary water.

Which of the above statements are correct?
A
(i) and (ii)
B
(i), (ii) and (iii)
C
(ii) and (iii)
D
(i) and (iii)

Explanation

Heavy water is used for slowing down the speed of neutrons in nuclear reactors, hence used as moderator. Boiling point of heavy water is greater (374.42 K) than that of ordinary water (373 K), hence heavy water is more associated. Dielectric constant of ordinary water is greater than that of heavy water, hence ordinary water is a better solvent.
2

AIPMT 2003

MCQ (Single Correct Answer)
The structure of H2O2 is
A
spherical
B
non-planar
C
planar
D
linear

Explanation

In H2O2 , the O–H groups are not in the same plane. So it has non-planar structure. It has a half-opened book structure in which the two O–H groups lie on the two pages of the book. The angle between two pages of the book is 94o and H–O–O bond angle is 97o.

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