(a) Fe

(b) K

(c) Sn

(d) Ca

(a) NH₃ is not a planar molecule; while BF₃ is a planar molecule

(b) NH₃ is a planar molecule; while BF₃ is a planar molecule

(c) Fluorine is more electronegative than nitrogen

(d)  Boron is more electronegative than nitrogen

(a) BF₃ and NO₃

(b) BF₃ and NF₃

(c) HO₃ and NH₃

(d) NH3 and NF₃

(A).  Acids
(B).  Metals
(C).  Alloys
(D).  Oxides

(A).  Increases
(B).  Decrease
(C).  Slightly increases
(D).  Cannot be determined

(A).  True
(B).  False

(A).  Increase
(B).  Decrease
(C).  Slightly increase
(D).  Do no change

(A).  Flow of free mobile electrons
(B).  Movement of ions
(C).  Either movement of electrons or ions
(D).  Cannot be said

(A).  Electrolyte
(B).  Electrode
(C).  Electrolysis
(D).  Electrochemical cell