grade 11 p block part2 Flashcards
1
Q
MX4 are generally covalent except
A
PbX4
SnX4
2
Q
Fullerene hybridisation
A
sp2
3
Q
Fullerene preparation
A
Heating graphite in presence of inert gas
4
Q
Prep of carbon black, coke, charcoal
A
Carbon black: Heating hydrocarbons in limited supply of air
Charcoal and coke: Heating wood and coal in absence of air
5
Q
1 carat =
A
200mg
6
Q
Dehydration of formic acid gives
A
CO + H2O
7
Q
Why is CO2 biologically imp
A
Low solubility in water
8
Q
pH of blood
A
7.26 to 7.42
9
Q
Crystalline forms of silica
A
Quartz, cristobalite, tridymite
10
Q
SiO2 non reactive because
A
high Si O bond enthalpy
11
Q
SiO2 + HF ———->
A
SiF4 + H2O
12
Q
SiO2 + NaOH
A
Na2SiO3 + H2O
13
Q
Chain length of silicone polymer can be blocked by adding
A
(CH3)3SiCl
