The gas used in balloons in the place of hydrogen is
nitrogen
helium
neon
argon
Correct Answer :
B. helium
Related Questions
Rayon la made from
cotton
wool
cellulose
silk
The compound of iron used in the manufacture of blue-black ink is
ferric chloride
ferric sulphate
ferric thiocyanate
ferrous sulphate
Flint glass contains
potassium and lead silicates
zinc and barium borosilicates
potassium and calcium silicates
sodium and calcium silicates
Which of the following is not an alloy of copper?
Bronze
Brass
Solder
Gun metal
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
An example of stimulant fertilizer is
gypsum
urea
potassium nitrate
ammonium phosphate
Galvanised iron sheets are protected from rusting due to the presence of a layer of
lead
chromium
zinc
tin
The value of Avogadro Number is
6.023 x 1022
1 x 10-14
cl 6.056 x 10-6
6.023 x 1023
Which of the following is a Bleaching agent?
Potassium chlorate
Hydrogen peroxide
Copper sulphate
Silver Nitrate
A compound used both as a fungicide and as a disinfectant is
chlorine
carbon monoxide
sulphur dioxide
o-cresol
White vitriol is
ZnSO4 . 7H2O
FeSO4 . 7H2O
MgSO4 . 7H2O
CaSO4 . 2H2O
Solder is an alloy of
tin and copper
tin and lead
tin and zinc
tin, copper and zinc
The Long Form of the Periodic Table is based on
atomic number
valency
atomic mass
atomic radius
The vitamin that is found in citrus fruits such as lemon and orange is
vitamin C
vitamin B2
vitamin A
vitamin E
The name rubber was given by
Lavoisier
Priestley
Dalton
Avogadro
Physico-chemical characteristics of water in water sources undergo changes due to
aquatic macrophytes
aquatic fungi
effluents
evapotranspiration
Brine is a solution of
sodium chloride in water
iodine in alcohol
sulphur in carbon disulphide
Potassium iodide in water
A mixture of carbon monoxide and hydrogen is
coal gas
producer gas
water gas
gobar gas
The ore of iron is
Dolomite
Magnetite
Bauxite
Anglesite
The process that takes place in the atom bomb is
nuclear' fusion
radioactive disintegration
nuclear fission
chemical decomposition
Which one of the following is used in dry cleaning of garments?
asphalt
naphtha
diesel oil
lubricating oil
Optical instruments are made of
pyrex glass
flint glass
quartz glass
Crooke's glass
The first organic compound prepared in the laboratory was
acetic acid
chloroform
urea
methane
The compound used in photography is
ammonium dichromate
copper Sulphate
magnesium Sulphate
sodium thiosulphate
The kinetic energy of gas molecules
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
Hydrogen gas has
a very sweet smell
a very pungent smell
an irritating smell
no smell at all
Rusting of iron cannot be prevented by
painting
applying alkaline phosphate
applying soap water
galvanising
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
Temporary hardness is due to the presence of
calcium carbonate
calcium bicarbonate
magnesium sulphate
calcium sulphate
The function of nitrogen in air is
to make air a moderate supporter of combustion
to maintain the density of air constant
to prevent the hydrogen in air from exploding
to reduce the poisonous nature of ozone in air