Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Sulphonates
Zeolites
Nitrates
None of these
Correct Answer :
B. Zeolites
Related Questions
Lightening cause rainfall because
It activate H2O molecule
Photo-electricity reaction starts
Some of the gas molecules become bigger
It cause combination of oxygen and nitrogen
According to Daltons atomic theory the smallest particle which can exist independently is
An atom
A cation
A molecule
An anion
Quartz crystals normally used in quartz clocks etc. is chemically
A mixture of B and C
Silicon dioxide
Germenium dioxide
Sodium Silicate
The solar eclipse occurs when
the sun comes in between the moon and the earth
the moon comes in between the sun and the earth
the earth comes in the between the sun and the moon
None of the above
The marine animal called dugong which is vulnerable to extinction is a/an
Amphibian
Shark
Bony fish
Mammal
The property of a substance to absorb moisture from the air on exposure is called
Desiccation
Efflorescence
Deliquescene
Osmosis
Rust is
A mixture of FeO and Fe(OH)2
A mixture of Fe2O3 and Fe(OH)2
A mixture of Fe2O3, 3H2O and FeO
FeO only
The location and energy of an electron in an atom can be specified by
Atomic number
Atomic mass
Quantum numbers
None of these
Cell membrane is
permeable
semipermeable
selectively permeable
impermeable
Glass is made from the mixture of
Quartz and mica
Sand and salt
Sand and silicates
None of these
The metal used in storage batteries
Zinc
Iron
Copper
Lead
Permanent hardness of water can be removed by adding
Potassium Permanganate
Bleaching Powder
Chlorine
Washing Soda
In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If both inputs are positive the output is zero. This is
an AND circuit
an OR circuit
a high-pass filter
a NOR circuit
Which of the following is in liquid form at room temperature ?
Sodium
Cerium
Francium
Lithium
Nitrification means
Conversion of nitrogen to nitric acid.
Production of nitrogen from air
Convert the atmospheric nitrogen to effective nitrogen compound.
Liquifaction of nitrogen
Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
A piece of iron that is not a permanent magnet
The north pole of another permanent magnet
A positively charged glass rod
A negatively charged rubber rod
Epoxy resins is used as
Adhesives
Detergents
Insecticides
Moth repellants
Which of the following elements is obtained from sea weeds ?
Argon
Vanadium
Iodine
Sulphur
Apparatus invented by Archimedes is :
Pulley
Microscope
Thermemoter
Barometer
The recent atomic weight scale is based on
1H1
1H2
6C12
8O16
Polythene is industrially prepared by the polymerisation of
styrene
methane
ethylene
acetylene
The metallic constituents of hard water are
Calcium, magnesium and iron
Magnesium, Calcium and tin
Magnesium, tin and iron
Iron, tin and calcium
Which of the following elements is a metal
S
Ga
Se
I
The speed of light with the rise in the temperature of the medium
Increases
Remains unaltered
Drops sharply
Decreases
In an atomic nucleus, neutrons and protons are held together by
Magnetic forces
Gravitational forces
Coulombic forces
Exchange forces
The fastest acting enzyme in the biological kingdom is
amylase
lipase
carboxypeptidase
carbonic anhydrase
Which of the following is the lightest metal ?
Mercury
Lithium
Lead
Silver
The smallest functional and structural unit of kidney is called as
Granulocyte
Neuron
Reticulocyte
Nephron
Bromine is
A Black solid
A red liquid
A highly inflammable gas
colourless gas insoluble in water
Which of the following elements is non-radioactive?
Uranium
Plutonium
Thorium
Zirconium