Q. Which one of the following is the number of water molecules that share with two formula unit CaSO4, in plaster of Paris ?
1) One
2) Two
3) Five
4) Ten
Q. How is carbon black obtained ?
1) By heating wood at high temperature in absence of air
2) By heating coal at high temperature in absence of air
3) By burning hydrocarbons in a limited supply of air
4) By heating coal at high temperature in presence of air
Q. Which one of the following properties is not true for graphite ?
1) Hybridisation of each carbon atom is sp3
2) Hybridisation of each carbon atom is sp2
3) Electrons are delocalized over the whole sheet of atoms
4) Each layer is composed of hexagonal rings
Q. Which one of the following is the purest form of Carbon ?
1) Charcoal
2) Coke
3) Fullerene
4) Carbon black
Q. The Poisonous nature of Carbon monoxide (CO) is due to its -
1) insolubility in water
2) ability to form a complex with haemoglobin
3) ability to reduce some metal oxides
4) property of having one sigma bond
Q. In case of STRIPS instruments, the minimum amount of ssecurities that needs to be submitted for stripping/ reconstitution would be ....... and in multiples thereof.
1) Rs. 3 crore
2) Rs. 5 crore
3) Rs. 10 crore
4) Rs. 1 crore
Q. Quartz crystals used in clocks are -
1) sodium silicate
2) silicon dioxide
3) germanium oxide
4) titanium oxide
Q. Bromine is a -
1) colourless gas
2) brown solid
3) highly inflammable gas
4) red liquid
Q. Gases used in welding are -
1) oxygen and hydrogen
2) oxygen and nitrogen
3) oxygen and acetylene
4) hydrogen and acetylene
Q. Galvanized iron pipes have a coating of -
1) Zinc
2) Mercury
3) Lead
4) Chromium
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