P Block Flashcards
1
Q
Calomel
A
Hg2Cl2
Used as secondary reference electrode
When in contact with ammonium hydroxide turns black
Hg2Cl2 +NH4OH—-> HgNH2Cl +Hg +NH4Cl+ H2O
2
Q
Apatite family
A
Ca9(PO4)6.CaX2. (X=F, Cl, Br) Flourapitite Ca9(PO4)6.CaF2 Found in phosphate rocks
3
Q
Metalloids in N family
A
As(Arsenic) Sb(Antimony)
4
Q
Reducing character of hydrides of N family
A
NH3
5
Q
Why are group 17 molecules coloured?
A
Cuz HOMO LUMO gap kam hai F2 yellow gas Cl2 greenish yellow gas Br2 red liquid I2 violet solid
6
Q
Haber’s process
A
N2 +3H2——-> 2NH3
200atm,700K, iron oxide with K2O&Al2O3
Mo as promoter
7
Q
Physical state of N family
A
N gas ,P soft solid, rest all solid
8
Q
State of N2O3
A
Blue solid
9
Q
State of NO2
A
Brown gas
10
Q
Trends in melting point of N family
A
N<p>Sb>Bi
N</p><p></p>
11
Q
Trends in electron affinity of O family
A
S>Se>Te>O
12
Q
Trends in electron affinity of F family
A
Cl>F>Br>I
13
Q
Trends in electron affinity of He family
A
Ne>Ar>Kr>Xe>Rn>He
