Tuesday, January 5, 2021
Reasoning Questions of Nitrogen family/15th /Pnictogens!
(1) What are
"pyro" oxy acids?
(2) What are
"Ortho" or "Meta" oxyacids?
(3) What is structure of (HPO3) metaphosphoric acid?
(4) Why Meta Phosphoric acid always exit in a polymeric form?
(5) What are the
structural difference between oxides ( P4O6 and P4O10) of phosphorous?
(6) What are common
structural features of oxides (P4O6 and P4O10) of
phosphorous?
(7) What are the explanation of Different Bond length and
Bond Angle In P4O6 and P4O10 :
(8) What is
"calgon" ? Give structure and its uses?
(9) Structure of Oxy
acids of Phosphorous:
(10) What is
structure of (HPO3) metaphosphoric acid?
(11) What is
metaphophoric (HPO3)?
(12) Why polarity of Ammonia (NH3) is more than NF3 ?
(13) Why is nitrous oxide (N2O) used as an anaesthetic in
dentistry?
(14) Which is more
basic N(CH3)3 or N(SiH3)3 , explain?
(15) Trisilyl amine,
N(SiH3)3 is planar whereas trimethyl amines N(CH3)3 is pyramidal. Explain why?.
(16) What are
abnormal behaviour of Nitrogen atom as compared to other family members?
(17) What is product
obtained when N2O5 is treated with NaCl?
(18) Phosphorus can
form PCl5 but nitrogen can not form NCl5 why?
(19) Are all the five
bonds of PCl5 equivalent? Justify your answer.
(20) Why PCl3
hydrolysed while NCl3 can not be hydrolysed?
(21) Which of the following is/are not known? PCl3, AsCl3,
SbCl3, NCl5, BiCl5
(22) Why bond angle
of hydrides of group 15, decreases down the group?
(23) Why nitrogen
shows catenation properties less than phosphorus?
(24) Why Nitrogen is
fairly inert gas?
(25) Why Nitrogen (N2)
is less reactive at room temperature?
(26) Where is liquid nitrogen used for?
(27) Why Nitrogen
dioxide (NO2) dimerises to form Dinitrogen tetraoxide (N2O4)?
(28) Why Nitrogen
dioxide (NO2) is coloured but Dinitrogen tetraoxide (N2O4) is colourless?
(29) Which will
have very fast tendency to dimerized ClO2 or NO and
why?
(30) Why does H3PO3 acts as a reducing agent but H3PO4 does
not?
(31) Hypophosphorous
acid (H3PO2) and Phosphorous acid (H3PO3) act as as good reducing agents while
H3PO4 does not.Why?
Phenyl group is known to extract negative inductive effect, but each phenyl ring in biphenyl is more reactive than benzene towards Electrophilic substation. Why?
It is because, in biphenyl, one of the phenyl groups acts as donor and the other as electron acceptor. This increases electron density on benzene ring and facilitates Electrophilic attack at ortho and para position.
Related questions;
Are all the five bonds of PCl5 equivalent? Justify your answer.
PCl5 has Sp3d hybridisation and trigonal bipiramidal geometry. PCl5 has three equivalent equatorial and two equivalent axial P – Cl bonds. However, due to greater bond pair – bond pair repulsions, the axial P – Cl bonds are longer and hence different from the three equatorial bonds
Sunday, January 3, 2021
Methylation of Diborane (B2H6) replace only four hydrogen why ?
Methylation of Doborane:
(1) In diborane two boron atoms and four terminal hydrogen atoms lie in one plane. While two bridge hydogen atoms (encircled ) lie smmetrically above and below the plane.
(2) Total valence electrons in B2H6 is 12(6 from boron
3x2) and 6 from six hydrogen atoms) and there are two B-H-B (3C-2e) bridge
bonds and four B-H (2C-2e) terminal bonds.
(3) Bond energy of B-H-B bond is 441 kj per mole
which greater than bond energy B-H bond (341Kj per mole)
hence methylation of diborane no more than four hydrogen.
(4) In above reaction it is clearly reveal that none of the bridge hydrogen in B2H6 has been replaced by –CH3 .ie in this reaction both the bridge bond remaine undissociate.
Related Questions:
(1) Why aqueous
solution of AlCl3 is acidic in nature ?
(2) What happen when
aq AlCl3 react with Acid or Base?
(3) Although
anhydrous aluminium chloride is covalent but its aqueous solution is ionic in
nature. Why?
(4) Why BF3 do not
exist as dimer?. Explain.
(5) Why B-F bond
length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?.
Explain.
(6) B-F bond length
in BF3 is shorter than B-F bond length in (BF4)- why?
(8) What is product
of reaction between diborane (B2H6) and ammmonia (NH3)?
(9) Why methylation
of Diborane (B2H6) replace four hydrogen only ?
(10) What is Use of
Boric Acid?
(11) What is use of
Orthoboric acids?
(12) What is basicity
of "Boric acid" ?
(13) Why Boric acid
exist in solid state ?
(14) What is
structure of solid Ortho Boric acid ?
(15) What is effect
of heat on Borax?
(16) What is the
structure of trimetaboric acid and trimetaborate ion?
(17) What is the
Sodium per borate ,give the structure and its uses?
(18) Why aqueous
solution of borax reacts with two moles of acids ?
(19) What is the
molecular formula of Borax ?
(20) Why Boric acid
become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
(21) Why Borazine is
more reactive than benzene towards Electrophic Aromatic substitution reactions
?
(22) Why Borazine
(B3N3H6) is also known as inorganic benzene ?.
(23) Four-center
two-electron bond (4C-2e Bond): Structure of AlCl3:
(24) What is the difference between the structure of AlCl3 and diborane?
What is the Sodium per borate ,give the structure and its uses?
Sodium per borate (NaBO3.H2O) (more correctly sodium dioxoborate peroxohydrate) is prepared from borax by treatment with NaOH to convert it to sodium borate (NaBO2) and further reaction with hydrogen peroxide.
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