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Q:

Highest percentage of carbon is found in which form of coal?

A) Anthracite B) Bituminous
C) Peat D) lignite
 
Answer & Explanation Answer: A) Anthracite

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Q:

Which of the following elements has the lowest melting point?

A) Helium B) Potassium
C) Tungsten D) Sulphur
 
Answer & Explanation Answer: A) Helium

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Q:

Which of the following elements has the lowest melting point?

A) Sodium B) Tin
C) Radon D) Radium
 
Answer & Explanation Answer: C) Radon

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Q:

Uraninite is an ore/mineral of _______.

A) Zinc B) Uranium
C) Titanium D) Aluminium
 
Answer & Explanation Answer: B) Uranium

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Q:

Pentane has _____ structural isomers.

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: C) 3

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Q:

Chemical composition of cement is

A) Limestone and Clay B) Limestone, Clay and Gypsum
C) Limestone and Gypsum D) Clay and Gypsum
 
Answer & Explanation Answer: B) Limestone, Clay and Gypsum

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Q:

‘Plum  Pudding  Model’  for  an  atom  was proposed by

A) Antoine Lavoisier B) Robert Boyle
C) Ernest Rutherford D) J. J. Thomson
 
Answer & Explanation Answer: D) J. J. Thomson

Explanation:

The   first   model   of   atom   was proposed   by   J.   J.   Thomson   in 1898.According  to  this  model,  the positive   charge   of   the   atom   is uniformly   distributed   throughout the  volume  of  the  atom  and  the negatively  charged  electrons  are embedded  in  it  like  seeds  in  a watermelon.    This    model    was picturesquely  called  plum  pudding model of the atom

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Q:

Acetic Acid is another name for which of the following?

A) Vinegar B) Baking Soda
C) Copper Sulphate D) Magnesium Oxide
 
Answer & Explanation Answer: A) Vinegar

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