P Block Elements(General Knowledge > General Science ) Questions and Answers

Question 1. Lack of Iodine can lead to persons experiencing dry eyes and dry mouth
  1.    TRUE
  2.    FALSE
Explanation:-
Answer: Option A. -> TRUE
Question 2. Can cause burning of the skin
  1.    Lead
  2.    Particle matter
  3.    Sulfur dioxide
  4.    Nitrogen oxides
Explanation:-
Answer: Option C. -> Sulfur dioxide
Question 3. Stable oxides of carbon are
  1.    CO, CO2
  2.    CO, C3O2
  3.    C2O,C3O2
  4.    C2O
Explanation:-
Answer: Option A. -> CO, CO2
Question 4. Nitrogen is chemically inert
  1.    Due to presence of double bond require more energy to break
  2.    Due to presence of triple bond require more energy to break
  3.    Triple bond requires less energy to break
  4.    None of the above
Explanation:-
Answer: Option B. -> Due to presence of triple bond require more energy to break
Question 5. One example of pseudohalogen is
  1.    CO2
  2.    SO3
  3.    (CN)2
  4.    ICl
Explanation:-
Answer: Option C. -> (CN)2
Question 6. Ozone is used to bleach flour/starch and prefered over SO2 and Cl2, because
  1.    ozone can bleach flour only
  2.    ozone is a dry bleaching agent
  3.    ozone is non poisonous
  4.    none of these
Explanation:-
Answer: Option B. -> ozone is a dry bleaching agent
Question 7. What is the coordination number of Fluorine in HOF?
  1.    -1
  2.    0
  3.    +1
  4.    none of these
Explanation:-
Answer: Option C. -> +1
Question 8. Which gas is often super-cooled and used as a liquid to remove warts?
  1.    nitrogen
  2.    oxygen
  3.    helium
  4.    carbon dioxide
Explanation:-
Answer: Option A. -> nitrogen
Question 9. All elements in the Halogen family react violently because
  1.    Halogens have 1 valence electron that they give away readily to other elements in reactions
  2.    Halogens have 7 valence electrons which gives up massive energy when they give all seven to other elements
  3.    Halogens need only 1 electron which they will violently take from other elements 
  4.    Halogens only react violently with water 
Explanation:-
Answer: Option C. -> Halogens need only 1 electron which they will violently take from other elements 
Question 10. Which has highest boiling agent
  1.    NH3
  2.    PH3
  3.    AsH3
  4.    BiH3
Explanation:-
Answer: Option D. -> BiH3
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