Chemistry Questions Answers

• 1. Who is regarded as father of modern chemistry ?

  1. Ruterford
  2. Einstein
  3. Lavoisier
  4. C.V. Raman

  
  

  Answer: Option C

  
  

• 2. Which is not a type of elements ?

  1. Metals
  2. Non Metals
  3. Metalloids
  4. Gases

   

  Answer: Option D

  
  

• 3. Which acid is present in lemon ?

  1. marlic acid
  2. citric acid
  3. lactic acid
  4. tartaric acid

   Answer And Explanation

  Answer: Option B

  Explanation:

  citric acid is present in lemon.

  
  

• 4. Identify the wrong statement in the following

  1. Atomic radius of the elements increases as one moves down the first group of the periodic table
  2. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
  3. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
  4. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

   

  Answer: Option C

  Explanation:

  
  

• 5. Rare gases are

  1. mono atomic
  2. di atomic
  3. tri atomic
  4. None of above

  
  

  Answer: Option B

  Explanation:

  Rare gases are di atomic.

  
  

• 6. The term PVC used in the plastic industry stands for

  1. polyvinyl chloride
  2. polyvinyl carbobate
  3. phosphor vanadiu chloride
  4. phosphavinyl chloride

   Answer And Explanation

  Answer: Option A

  
  

• 7. What among following is used to produce artificial rain ?

  1. copper oxide
  2. carbon monoxide
  3. silver iodide
  4. silver nitrate

   Answer And Explanation

  Answer: Option C

  • 8. Oil of vitriol is 

  
  

  • 1. nitric acid
    2. sulphuric acid
    3. hydrochloric acid
    4. phosphoric acid

     Answer And Explanation

    Answer: Option B

    
    

  • 9. Which is used in preparation of dynamite ?

    1. glycerol
    2. ethyl alcohol
    3. methyl alcohol
    4. glycol

    
    

    Answer: Option A

    
    

  • 10. What is Calcium sulphate ?

    1. epsom salt
    2. blue vitriol
    3. gypsum salt
    4. potash alum

     Answer

    Answer: Option C

    Explanation:

    
    

  • 11. Bleaching action of chlorine is by

    1. decomposition
    2. hydrolysis
    3. reduction
    4. oxidation

     Answer And Explanation

    Answer: Option A

    
    

  • 12. Which metal is heaviest ?

    1. osmium
    2. mercury
    3. iron
    4. nickle

     Answer: Option B

CUBANE

• Cubane (C8H8) is a synthetic hydrocarbon molecule that consists of eight carbon atoms arranged at the corners of a cube, with one hydrogen atom attached to each carbon atom.

• A solid crystalline substance, cubane is one of the Platonic hydrocarbons.

• It was first synthesized in 1964 by Philip Eaton

• Once formed, cubane is quite kinetically stable, due to a lack of readily available decomposition paths.

Properties of cubane and its derivatives

1. The 90-degree bonding angle of the carbon atoms in cubane means that the bonds are highly strained. Highly reactive so useful in high density high energy fuels and explosives.