Temporary hardness is due to the presence of
calcium carbonate
calcium bicarbonate
magnesium sulphate
calcium sulphate
Correct Answer :
B. calcium bicarbonate
Related Questions
The poisonous nature of carbon monoxide is due to
cutting off supply of oxygen
it™s being converted into carbon dioxide
its combination with haemoglobin of blood
its blocking of vocal chords
The alloy added in the preparation of steel contains
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
Which of the following is a communicable disease caused by viruses?
Cholera
Dysentery
Diabetes
Measles
Lunar caustic is
calcium sulphate
ammonium chloride
caustic soda
silver nitrate
In the nitrogen cycle, denitrifying bacteria
oxidise ammonia to nitrates
convert nitrogen into ammonia
oxidise ammonia to free nitrogen
oxidise ammonia to oxides of nitrogen
A common rodenticide is (Rat Poison)
malathion
parathion
zinc phosphide
diuron
Iron is coated with zinc to prevent rusting. The process is called
annealing
tempering
calcining
galvanising
Rusting is a special case of corrosion applied to
nickel
tin
iron
chromium
Tincture iodine is a solution of
iodine in potassium iodide
iodine in alcohol
iodine in water
iodine in carbon disulphide
The scientist associated with the discovery of the nucleus was
Rutherford
Moseley
Niels Bohr
J.J. Thomson
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
The science which deals with the chemistry of life processes is known as
electrochemistry
physical chemistry
biochemistry
tinctorial chemistry
The Long Form of the Periodic Table is based on
atomic number
valency
atomic mass
atomic radius
Cinnabar is an ore of
lead
zinc
mercury
chromium
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
Nylon is made from
terephthalic acid and ethylene glycol
hexamethylene diamine and adipic acid
cellulose nitrate
cellulose acetate
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
The artificial silk produced from cellulose is
Polyethylene
Nylon
Terylene
Rayon
The main constituent of gobar gas is
methane
nitrogen
carbondioxide
ethylene
The first organic compound prepared in the laboratory was
acetic acid
chloroform
urea
methane
CAN is used as (Calcium Ammonium Nitrate)
an explosive
a fertilizer
a dye
a bleaching agent
The hormone which absorption is increases glucose oxidation and glucose
adrenalin
thyroxin
insulin
epinephrine
Which of the following statements regarding natural radioactivity is true?
It is spontaneous disintegration of atoms
It is induced by bombardment with projectiles
It is transmutation of atoms with projectiles
It is dependent on temperature
Deficiency of iron causes
nervous disorders
heart diseases
anaemia
impairment of vision
Which of the following is not a supporter of combustion?
Oxygen
Air
Hydrogen
Chlorine
A compound of carbon used as anaesthetic is
carbon disulphide
carbon tetrachloride
phosgene
chloroform
The formula for cane sugar is
C6H12O6
C2H5OH
C12H22O11
C7H8O
A mixture of ethyl alcohol and water can be separated by
evaporation
sublimation
using a separating funnel
fractional distillation
Which or the following is not a constituent or gun powder?
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane