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 Chemistry Questions

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Q:

Which of the following is NOT a radioactive element?

A) Uranium B) Plutonium
C) Titanium D) Thorium
 
Answer & Explanation Answer: C) Titanium

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Q:

CuO + H2 ---> Cu + H2O. This equation is an example of

A) Oxidation B) Decomposition
C) Reduction D) Redox
 
Answer & Explanation Answer: D) Redox

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Q:

There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?

A) 22 B) 7
C) 37 D) 15
 
Answer & Explanation Answer: C) 37

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Q:

The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.

A) 7 B) 5
C) 4 D) 6
 
Answer & Explanation Answer: B) 5

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0 912
Q:

If the first and third members of a Dobereiner triad are Phosphorous and Antimony, the second member of this triad is

A) Calcium B) Iodine
C) Arsenic D) Sulphur
 
Answer & Explanation Answer: C) Arsenic

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Q:

Which of the following gases turns lime water milky?

A) O3 B) CO2
C) O2 D) CO
 
Answer & Explanation Answer: B) CO2

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1 909
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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0 907
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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