Heavy water was discovered by
TW Richards
FW Aston
Stas
Urey
Correct Answer :
D. Urey
Related Questions
Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because otherwise
it becomes coloured
it gets evaporated in air
it gets oxidised to phosgene
it gets decomposed to chloropicrin
The rate of setting of cement is slowed down by the addition of
quicklime
gypsum
soda lime
bleaching powder
Which of the following represents a physical change?
sublimation
oxidation
reduction
decomposition
Laughing gas is
nitric oxide
nitrogen peroxide
nitrogen pentoxide
nitrous oxide
Leakage in Liquefied Petroleum Gas (LPG) cylinders is easily detected by adding
mercaptans
propylene
carbon disulphide
phosgene
Galvanised iron sheets are protected from rusting due to the presence of a layer of
lead
chromium
zinc
tin
Invert sugar is
sucrose
glucose
fructose
a mixture of glucose and fructose
Graphite la a good conductor of electricity because
it is an allotrope of carbon
it gives CO2 on heating
it contains free electrons
it is oxidised to graphitic acid
Bordeaux mixture contains
copper sulphate and water
copper sulphate, lime and water
thio-urea and lime
copper sulphate and thio-urea
Copper is purified by
poling
tempering
calcination
galvanising
In the mouth, starch is converted into ______ by the action of saliva.
sucrose
glucose
fructose
mannose
Even as early as 3000 BC glass was known to the
Europeans
Egyptians
Asians
Americans
Which of the following is a mixture?
Baking soda
Milk
Chloroform
Copper wire
Ascorbic acid is the chemical name for
Vitamin B6
Vitamin C
Vitamin K
Vitamin D
The flux added in the blast furnace is
Limestone
FeO
SiO2
MgO
Dust particles in the air of large industrial cities are removed by
Sedimentation
Electrophoresis
Tyndall effect
Brownian movement
Solid carbon dioxide is used
as a drying agent
as a refrigerant
as an antiseptic
as a bleaching agent
Rayon la made from
cotton
wool
cellulose
silk
During fermentation, the by-product is
ethyl alcohol
methyl alcohol
carbon monoxide
carbon dioxide
The most abundant constituent in air is
hydrogen
nitrogen
oxygen
noble gases
Deficiency of iron causes
nervous disorders
heart diseases
anaemia
impairment of vision
The science which deals with the chemistry of life processes is known as
electrochemistry
physical chemistry
biochemistry
tinctorial chemistry
Which of the following is not a physical change?
Distillation of water
Action of heat on potassium chlorate
Powdering of glass
Burning of an electric lamp
The compound which is both an antiseptic and a disinfectant is
phenol
iodoform
bleaching powder
blue vitriol
The discoverer of chloroform was
Liebig
Pasteur
Bunsen
Erlenmeyer
Isotopes differ in the number of
Protons
Neutrons
Electrons
Protons and electrons
Iron is coated with zinc to prevent rusting. The process is called
annealing
tempering
calcining
galvanising
The human body contains about
50% water
10% water
70% water
20% water
If people sleep in closed rooms where charcoal fire is burning, they die due to
carbon monoxide
carbon dioxide
methane
phosgene
Which of the following is a Bleaching agent?
Potassium chlorate
Hydrogen peroxide
Copper sulphate
Silver Nitrate