Chemistry Questions and Answers

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1.

The purest form of iron is 

   A.) wrought iron
   B.) nickel steel
   C.) steel
   D.) pig iron

Answer: Option 'A'

Wrought Iron is the purest form of iron. It contains 0.12 to 0.25% carbonand so it is the purest form of iron.

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2.

A mixture of sand and naphthalene can be separated by

   A.) Fractional distillation
   B.) Sublimation
   C.) Chromatography
   D.) Any of them

Answer: Option 'B'

Sublimation

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3.

Hydrogen bomb is based on the principle of  

   A.) natural radioactivity
   B.) nuclear fusion
   C.) nuclear fission
   D.) artificial radioactivity

Answer: Option 'B'

nuclear fusion

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4.

What is the structure of IF7?

   A.) Triagonal bipyramid
   B.) Pentagonal bipyramid
   C.) Square pyramid
   D.) tetrahedral

Answer: Option 'B'

In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees

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5.

Among the given nutrients, milk is a poor source of

   A.) Vitamin C
   B.) Carbohydrates
   C.) Protein
   D.) Calcium

Answer: Option 'A'

Vitamin C

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6.

'Yellow cake' an item of smuggling across border s

   A.) Uranium oxide
   B.) Unrefined gold
   C.) A crude form of heroin
   D.) A crude form of cocaine

Answer: Option 'A'

Uranium oxide

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7.

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

   A.) archimedes
   B.) Newton
   C.) Eienstein
   D.) Giorgi

Answer: Option 'D'

Giorgi

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8.

Which of the following is a non metal that remains liquid at room temperature?

   A.) Bromine
   B.) Helium
   C.) Phosphorous
   D.) Chlorine

Answer: Option 'A'

Bromine

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9.

'Misch metal' is widely used in manufacture of which of the following

   A.) Material of car brake
   B.) Cigarette lighters
   C.) Smoke detectors
   D.) Emergency lights

Answer: Option 'B'

Cigarette lighters

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10.

A radioactive substance has a half life of four months, three-fourth of the substance would decay in

   A.) 3 months
   B.) 8 months
   C.) 4 months
   D.) 12 months

Answer: Option 'B'

8 months

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