chemistry Flashcards
1
Q
Which EX3 is not stable?
A
NX3 (But NF3 is stable)
2
Q
Which EX3 halides are covalent?
A
All except BiF3
3
Q
Does NX5 exist?
A
No, coz N doesn’t have vacant d orbitals
4
Q
What method of preparation gives pure N2?
A
Thermal decomposition of sodium and barium azide
5
Q
Nitrolim (Fertilizer)
A
CaCN2+C
6
Q
Catalyst used in Haber process? Now VS earlier
A
Now: Fe along with Al2O3 and K2O
Earlier: Fe along with Mo as promoter
7
Q
Brown Ring test
A
Nitrate salt + FeSO4 + conc. H2SO4.
Brown ring formed due to: [Fe(H2O)5(NO)]
8
Q
Bauxite
A
Al2O3.2H2O
9
Q
Pyrolusite
A
MnO2 (black)
10
Q
Haematite
A
Fe2O3
11
Q
Cassiterite
A
SnO2
12
Q
Which element is found in hair as keratin
A
sulphur
13
Q
Gypsum
A
CaSO4.2H2O
14
Q
Baryte
A
BaSO4
15
Q
Epsom salt
A
MgSO4.7H2O
