Coke is a substance obtained
from coal mines
when wood is burnt in excess of air
by heating coal out of contact with air
by heating wood out to contact with air
Correct Answer :
C. by heating coal out of contact with air
Related Questions
Cholesterol is
a carbohydrate
a protein
a lipid
a hormone
In the mouth, starch is converted into ______ by the action of saliva.
sucrose
glucose
fructose
mannose
Reduction involves
loss of electrons
gain of electrons
gain of oxygen
removal of hydrogen
A substance used both as an explosive and as a germicide is
phenol
TNT
picric acid
iodoform
CAN is used as (Calcium Ammonium Nitrate)
an explosive
a fertilizer
a dye
a bleaching agent
Solid carbon dioxide (Dry ice) is also known as
Thiokol
Drikold
Perhydrol
Mannitol
Phosgene is a compound of
red phosphorus and oxygen
white phosphorus and oxygen
carbon monoxide and chlorine
carbon dioxide and chlorine
A metal which occurs 'free' in nature is
gold
zinc
tin
molybdenum
Rusting is
an oxidation process
a reduction process
a physical change
an electro-chemical process
Rain water collected after a shower la very pure because
the initial showers wash the atmosphere free from most of the impurities
it contains desirable salts like sodium chloride and ammonium nitrate
it dissolves the gases in the atmosphere like ozone which are good for health in small quantities
it is supposed to be 'heaven sent'
A mixture of naphthalene and sand is separated by
evaporation
using a magnet
sublimation
sedimentation
Which of the following metals is the best conductor of heat and electricity?
Aluminium
Silver
Copper
Magnesium
If people sleep in closed rooms where charcoal fire is burning, they die due to
carbon monoxide
carbon dioxide
methane
phosgene
The substance most abundantly found in sea water is
magnesium chloride
sodium chloride
calcium sulphate
potassium chloride
Which of the following is called 'the King of Chemicals?
Nitric acid
Hydrochloric acid
Silver nitrate
Sulphuric acid
The earliest known acid is
nitric acid
oxalic acid
carbonic acid
acetic acid
In the process of purification of water for town supply, the substance used to remove bad smell and colour from water is
charcoal
bleaching powder
chlorine
carbolic acid
Lead pencils contain
white lead
graphite
red lead
coke
Which among the following is a solid non-metal?
chlorine
mercury
water
iodine
Marsh gas is
ethane
ethylene
acetylene
methane
Laughing gas is
nitric oxide
nitrogen peroxide
nitrogen pentoxide
nitrous oxide
The pH or pure water is nearly 7.0 It will increase on the addition or
hydrochloric acid
ammonia
cane sugar
common salt
A burning substance which continues to burn in a jar of carbon dioxide is
zinc
red phosphorus
magnesium
sulphur
Dry Ice is
solid carbon dioxide
liquid oxygen
liquid hydrogen
liquid. Chlorine
Triple Antigen treatment for children is to ward off
whooping cough
tetanus
diphtheria
All the three
Solid carbon dioxide is used
as a drying agent
as a refrigerant
as an antiseptic
as a bleaching agent
Carbogen is used in
CO2 poisoning
CO poisoning
phosgene poisoning
anesthesia
The first organic compound prepared in the laboratory was
acetic acid
chloroform
urea
methane
Two or more entirely different compounds having the same molecular formula are known as
isobars
isotopes
isomorphs
isomers
Deficiency of iron causes
nervous disorders
heart diseases
anaemia
impairment of vision