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Q:

Which of the following is not a Halon gas ?

A) methane B) Carbon tetra chloride
C) iodomethane D) bromomethane
 
Answer & Explanation Answer: A) methane

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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:

___________ is obtained by evaporation of sea.

A) Sugar B) Iron
C) Salt D) Steel
 
Answer & Explanation Answer: C) Salt

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Q:

What  is  the  number  of  atoms  in  46  g  of sodium-23 (N = Avogadro constant)?

A) N/2 B) N
C) 2N D) 23 N
 
Answer & Explanation Answer: C) 2N

Explanation:
Number of atoms in 46 grams of sodium - 23 will be 2N.
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Q:

Atomic number of which of the following elements is greater than that of Magnesium

A) Neon B) Fluorine
C) Sodium D) Aluminium
 
Answer & Explanation Answer: D) Aluminium

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Q:

Which of the following elements has the lowest melting point?

A) Titanium B) Tungsten
C) Argon D) Nickel
 
Answer & Explanation Answer: C) Argon

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Q:

Which of the following statements is INCORRECT?

A) Solids have definite volume  B) solids are rigid 
C) Solids have indefinite shape  D) Solids are almost incompressible
 
Answer & Explanation Answer: C) Solids have indefinite shape 

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Q:

____ is not an allotrope of carbon.

A) Buckminsterfullerene B) Carbon Dioxide
C) Diamond D) Graphite
 
Answer & Explanation Answer: B) Carbon Dioxide

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