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Wednesday, September 9, 2020

Imortant reasoning Questions of Boron family (13th group) for IIT mains/advanced and NEET also !

(1) Why Ga has small size than Al exceptionally


(2) Why aqueous solution of borax reacts with two moles of acids ?

What is structure of solid Ortho Boric acid ?


(3) What is the structure of trimetaboric acid and trimetaborate ion?  


(4) Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?


(5) Why Borazine (B3N3H6) is also known as inorganic benzene ?.


(6) Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.


(7) Why B-F do not exist as dimer?. Explain.


(8) Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?


(9) Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?


(10) Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:


(11) What is the molecular formula of Borax ?


(12) What is the difference between the structure of AlCl3 and diborane?


(13) Titration of Borax: Tincal : Suhaga :


(14) Structure of Borax: Tincal or Suhaga:


(15) Titration of Boric Acid:


(15) DIBORANE-HYDRIDE OF BORONE-(B2H6):


(16) CHEMICAL PROPERTIES OF DIBORANE:


(17) STRUCTURE OF BORON NITRIDE:


(18) STRUCTURE OF BORAZINE OR BORAZOLE:


(19) STRUCTURE OF DIBORANE :


(20) BORIC ACID (H3BO3) :


(21) BORAX BEAD TEST:

 

Related Questions:

 

(1) What are Silicones? explain with examples.


(2) What are "pyro" oxy acids?


(3) What are "Ortho" or "Meta" oxyacids? 


(4) What is Meta Boric Acids? 


(5) What are the structural difference between oxides ( P4O6 and P4O10) of phosphorous? 


(6) What are common structural features of oxides (P4O6 and P4O5) of phosphorous?




 

 

 

 

 

Thursday, August 6, 2020

Iodine forms I3- but F2 does not form F3- ions. Why?

I2 because of the presence of vacant d– orbitals accepts electrons form 
I ions to form I3 ions but F2 because of the absence of d – orbitals does not 
accept electrons from F ions to form F3- ions.

Why the elements of the second row (first short period) show a number of differences in properties from other members of their respective families?

The differences in the properties of the first member of a group from those of the other members are due to 
(i) the smaller size of atom. 
(ii) presence of one inner shell of two electrons and 
(iii) absence of d – orbitals.

Why is nitrous oxide (N2O) used as an anaesthetic in dentistry?

N2O is used as an anaesthetic in dentistry because of its inertness.