Radium was isolated from
galena
dolomite
sylvine
pitchblende
Correct Answer :
D. pitchblende
Related Questions
Reduction involves
loss of electrons
gain of electrons
gain of oxygen
removal of hydrogen
Brine is a solution of
sodium chloride in water
iodine in alcohol
sulphur in carbon disulphide
Potassium iodide in water
Gold dissolves in aqua regia due to the formation of
chloro auric acid
auric chloride
gold nitrate
aurous chloride
An element which is preserved under water is
Sodium
red phosphorus
white phosphorus
sulphur
The compound which is both an antiseptic and a disinfectant is
phenol
iodoform
bleaching powder
blue vitriol
Which of the following types of water gives lather easily with soap?
Hard water
Heavy water
Soft water
Both (a) and (b)
Fructose is also called
dextrose
fruit sugar
beet sugar
blood sugar
PAS is a drug used In the treatment of
tuberculosis
cancer
typhoid
malaria
The most abundant constituent in air is
hydrogen
nitrogen
oxygen
noble gases
A drug that is usually administered for malaria is
sulphanilamide
quinine
methicillin
novocaine
Hydrogen gas has
a very sweet smell
a very pungent smell
an irritating smell
no smell at all
The raw materials required for the manufacture of glass are
silica, sodium nitrate and soda ash
silica, limestone and sodium nitrate
silica, sodium oxide and limestone
silica, soda ash and limestone
Marble is
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
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
Temporary hardness is due to the presence of
calcium carbonate
calcium bicarbonate
magnesium sulphate
calcium sulphate
The addition of a neutron to the nucleus of an atom
increases the atomic mass of the atom
decreases the atomic mass of the atom
increases the charge on the nucleus
decreases the charge on the nucleus
Argyrol used as eye ointment is a solution of
hydrogen peroxide
silver nitrate
tincture iodine
m-cresol
The modern system of symbols was evolved by
Dalton
Cavendish
Avogadro
Berzelius
Which one of the following gases is extremely soluble in water?
Carbon dioxide
Ammonia
Chlorine
Hydrogen sulphide
The carbon cycle ensures that
the percentage of carbon dioxide in air is kept almost constant
air always contains a constant proportion of oxygen
sufficient amounts of carbohydrates are produced
the process of photosynthesis proceeds smoothly
Grape sugar is another name for
glucose
fructose
sucrose
maltose
Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions
The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by
A - Z
A + Z
Z
A
Real gases tend to become ideal Under
low pressure and high temperature
low pressure and low temperature
high pressure and low temperature
high pressure and high temperature
Marsh gas is
ethane
ethylene
acetylene
methane
Oxalic acid is used in the manufacture of
tincture iodine
paints
ink
aerated water
The alloy which is extremely hard and resistant to acids is
chrome steel
silicon steel
stainless steel
invar
Clark's method for removal of temporary hardness in water uses
calcium hydroxide
washing soda
calcium chloride
zeolite
If people sleep in closed rooms where charcoal fire is burning, they die due to
carbon monoxide
carbon dioxide
methane
phosgene
Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?
Silicon
Oxygen
Carbon
Calcium