The property which is not true about fluorine is
most of its reactions are exothermic
it forms only one oxo acid
highest electronegativity
high F-Fbond dissociation enthalpy
D.
high F-Fbond dissociation enthalpy
Due to the presence of 7 valence electrons in a very small volume of fluorine atom, its bond dissociation energy is low (as they repel each other strongly). Thus, statement (d) is incorrect.
Which is true regarding nitrogen?
Less electronegative
Has low ionisation enthalpy
d-orbitals are available
Ability to form bonds with itself
The number of isomers possible for the octahedral complex [CoCl2(en)(NH3)2]+ is
two
three
no isomer
four isomers
The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is
Mn2+
Cu2+
Sc2+
Cu+
When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH3 to give; an explosive compound (C). The compounds A, B and C respectively are
A - MnO2; B - Cl2; C - NCl3
A - MnO; B - Cl2; C - NH4Cl
A - Mn3O4; B - Cl2; C - NCl3
A - MnO3; B - Cl2; C - NCl2
Mn2+ compounds are more stable than Fe2+ compounds towards oxidation to their +3 state, because
Mn2+ is more stable with high 3rd ionisation energy
Mn2+ is bigger in size
Mn2+ has completely filled d-orbital
Mn2+ does not exist
As per IUPAC norms, the name of the complex [Co(en)2(ONO)Cl]Cl is
chlorido bis (ethane-1, 2-diamine) nitro-O-cobalt (III) chloride
chlorido bis (ethylenediamine) nitro-O-cobalt (III) chloride
chlorido di (ethylenediamine) nitrocobalt (III) chloride
chloro ethylenediaminenitr-O-cobalt (III) chloride
Reactivity order of halides for dehydrohalogenation is
R - F > R - Cl > R - Br > R - I
R - I > R - Br > R - Cl > R - F
R - I > R - Cl > R - Br > R - F
R - F > R - I > R - Br > R - Cl
Replacement of Cl of chlorobenzene to give phenol requires drastic conditions, but Cl of 2, 4-dinitrochlorobenzene is readily replaced. This is because
-NO2 group makes the ring electron rich at ortho and para-positions
-NO2 group withdraws electrons from meta-position
-NO2 donates electrons at meta-position
-NO2 withdraws electrons from ortho and para-positions