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Q:

Researchers at the University of Illinois have discovered new form of matter called Excitonium which was coined by ______ in the 1960’

A) Bertrand Halperin B) Eugene Wigner
C) Paul Dirac D) Felix Bloch
 
Answer & Explanation Answer: A) Bertrand Halperin

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0 908
Q:

The   chemical   properties   of   an   element depend upon

A) the number of isotopes of the element B) the mass number of the element
C) the  total  number  of  neutrons  in  the element D) the    number    of    electrons    in    the outermost shell of the element
 
Answer & Explanation Answer: D) the    number    of    electrons    in    the outermost shell of the element

Explanation:

Chemical  properties of  an element depend   on the number   and   the configuration   of   their   (valence) electrons.

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0 906
Q:

Chemical properties of isotopes .............

A) must be same B) must be different
C) need not be same D) need not be different
 
Answer & Explanation Answer: A) must be same

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0 904
Q:

Why do atoms bond?

A) To reduce potential energy and gain stability B) To make atoms
C) To increase potential energy and lose stability D) To increase potential energy and gain stability
 
Answer & Explanation Answer: A) To reduce potential energy and gain stability

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0 901
Q:

Why does carbon tetrachloride have no dipole moment?

A) Because of same size of carbon and chlorine atoms B) Because of regular tetrahedral structure
C) Because of planar structure D) Because of similar electron affinities of carbon and chlorine
 
Answer & Explanation Answer: B) Because of regular tetrahedral structure

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4 898
Q:

In the Modern Periodic Table, elements are arranged in

A) increasing atomic mass number B) increasing atomic number
C) decreasing atomic mass number D) decreasing atomic number
 
Answer & Explanation Answer: B) increasing atomic number

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0 895
Q:

When two liquids do not mix with each other to form a solution, what is it called?

A) Solvent B) Solute
C) Immiscible D) Decantation
 
Answer & Explanation Answer: C) Immiscible

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1 893
Q:

The most active ingredient in bleaching powder is

A) Iodine B) Calcium hypochlorite
C) Nitric acid D) Ammonium sulphate
 
Answer & Explanation Answer: B) Calcium hypochlorite

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