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 Chemistry Questions

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Q:

 A mixture of sand and naphthalene can be separated by

A) Fractional distillation B) Sublimation
C) Chromatography D) Any of them
 
Answer & Explanation Answer: B) Sublimation

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87 20034
Q:

What is the third most common gas found in the air we breathe ?

A) Argon B) Neon
C) Carbondioxide D) Hydrogen
 
Answer & Explanation Answer: A) Argon

Explanation:

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

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55 19632
Q:

Which one of the following substances does not have a melting point

A) bromine B) sodium chloride
C) mercury D) glass
 
Answer & Explanation Answer: D) glass

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68 19275
Q:

' Yellow cake ' an item of smuggling across border s

A) A crude form of heroin B) A crude form of cocaine
C) Uranium oxide D) Unrefined gold
 
Answer & Explanation Answer: C) Uranium oxide

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117 19235
Q:

Cobalt - 60 is commonly used in radiation therapy because it emits

A) alpha - rays B) beta rays
C) gamma rays D) X - rays
 
Answer & Explanation Answer: C) gamma rays

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94 18743
Q:

The M.K.S. system was first introduced by

A) archimedes B) Eienstein
C) Newton D) Giorgi
 
Answer & Explanation Answer: D) Giorgi

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93 18374
Q:

Which one of the following mixture is homogeneous

A) starch and sugar B) methanol and water
C) graphite and charcoal D) calcium carbonate and calcium bicarbonate
 
Answer & Explanation Answer: B) methanol and water

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76 18358
Q:

Sodium carbonate crystal lose water molecules this property is called

A) hygroscopy B) deliquescence
C) efflorescence D) None of these
 
Answer & Explanation Answer: C) efflorescence

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63 17455