Chemistry Questions and Answers

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.

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

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

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

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

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

7.

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

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

Answer: Option 'D'

Giorgi

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

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

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

11.

Which one of the following elements is essential for construction is nuclear reactors

   A.) Cobalt
   B.) Zirconium
   C.) Nickel
   D.) Tungsten

Answer: Option 'B'

Zirconium

12.

Sodium carbonate crystal lose water molecules this property is called

   A.) efflorescence
   B.) hygroscopy
   C.) deliquescence
   D.) None of these

Answer: Option 'A'

efflorescence

13.

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

   A.) alpha - rays
   B.) X - rays
   C.) beta rays
   D.) gamma rays

Answer: Option 'D'

gamma rays

14.

Which one of the following is not a mixture

   A.) milk
   B.) mercury
   C.) cementair
   D.) air

Answer: Option 'B'

mercury

15.

When formaldehyde and potassium hydroxide are heated , we get 

   A.) Methane
   B.) Methyl alcohol
   C.) Acetylene
   D.) Ethyl formate

Answer: Option 'B'

Methyl alcohol

16.

Which one is not metal

   A.) sulpher
   B.) sugar
   C.) nitogen
   D.) all of these

Answer: Option 'D'

all of these

17.

The discovery of neutron became very late because

   A.) it does not move
   B.) it is present in nucleus
   C.) it is a fundamental particle
   D.) it does not carry any charge

Answer: Option 'D'

it does not carry any charge

18.

Which one of the following mixture is homogeneous

   A.) graphite and charcoal
   B.) methanol and water
   C.) calcium carbonate and calcium bicarbonate
   D.) starch and sugar

Answer: Option 'B'

methanol and water

19.

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

   A.) mercury
   B.) glass
   C.) sodium chloride
   D.) bromine

Answer: Option 'B'

glass

20.

The electrochemical cell stops working after some time because ________

   A.) Electrode potential of both the electrodes becomes zero
   B.) One of electrodes completely vanishes
   C.) Electrode potential of both electrodes equalizes
   D.) The reaction reverses its direction

Answer: Option 'C'

Electrode potential of both electrodes equalizes


Chemistry Questions and Answers Download Pdf