1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is the number of water molecules that share with two formula unit of CaSO4 in plaster of Paris?
A
One
B
Two
C
Five
D
Ten
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
How is carbon black obtained?
A
By heating wood at high temperature in absence of air
B
By heating coal at high temperature in absence of air
C
By burning hydrocarbons in a limited supply of air
D
By heating coal at high temperature in presence of air
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following properties is not true for graphite?
A
Hybridisation of each carbon atom is sp3
B
Hybridisation of each carbon atom is sp2
C
Electrons are delocalised over the whole sheet of atoms
D
Each layer is composed of hexagonal rings
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is the purest form of carbon?
A
Charcoal
B
Coke
C
Fullerene
D
Carbon black
Questions Asked from Marks 2.5