Permanent hardness of water can be removed by adding
Potassium Permanganate
Bleaching Powder
Chlorine
Washing Soda
Correct Answer :
D. Washing Soda
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
The type of glass used in making prisms and lenses is
Pyrex glass
Soft glass
Flint glass
Jena glass
The property of a substance to absorb moisture from the air on exposure is called
Desiccation
Efflorescence
Deliquescene
Osmosis
Liquefied Petroleum gas (LPG) consists of mainly
Methane, Butane and Propane
Methane, Ethane and Hexane
Ethane, Hexane and Nonane
Methane, Hexane and Nonane
What is the unit for measuring the pitch or frequency of sound ?
Coulomb
Hum
Cycles
Decible
Which of the following elements is obtained from sea weeds ?
Argon
Vanadium
Iodine
Sulphur
The smallest functional and structural unit of kidney is called as
Granulocyte
Neuron
Reticulocyte
Nephron
Apparatus invented by Archimedes is :
Pulley
Microscope
Thermemoter
Barometer
The intencity of Earthquakes is measured on
Beaufort scale
Secant scale
Mercalli scale
Richter scale
The element present in the largest amount in rocks and minerals is
Carbon
Hydrogen
Aluminium
Silicon
The Panda belongs to the same family as that of
Cat
Bear
Rabbit
Dog
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
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
In an atomic nucleus, neutrons and protons are held together by
Magnetic forces
Gravitational forces
Coulombic forces
Exchange forces
The removal of top soil by water or wind is called
Soil erosion
Soil wash
Silting of soil
Soil creep
Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous glass called
Carbon Monoxide
Phosgene
Phosphine
None of these
The major ingredient of leather is
Nucleic acid
Carbohydrate
Collagen
Polymer
Which of the following parts of the sun is easily visible only during a total solar eclipse?
core
photosphere
sunspots
corona
The metal used in storage batteries
Zinc
Iron
Copper
Lead
The metallic constituents of hard water are
Calcium, magnesium and iron
Magnesium, Calcium and tin
Magnesium, tin and iron
Iron, tin and calcium
Brass gets discoloured in air due to the presence of which gas in air
Carbon dioxide
Hydrogen Sulphide
Oxygen
Nitrogen
Quartz crystals normally used in quartz clocks etc. is chemically
A mixture of B and C
Silicon dioxide
Germenium dioxide
Sodium Silicate
The location and energy of an electron in an atom can be specified by
Atomic number
Atomic mass
Quantum numbers
None of these
The chemial name of Uria is
Carbamide
Chloroetane
Aneurin
None of these
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
When a gas is turned into a liquid, the process is called
evaporation
condensation
sublimation
deposition
Which of the following elements is a metal
S
Ga
Se
I
The colour of Emerald is
Deep Green
Violet
Prussian Blue
Yellow
The marine animal called dugong which is vulnerable to extinction is a/an
Amphibian
Shark
Bony fish
Mammal
The metal that is present in Photo Films is
Silver
Magnesium
Platinium
Mercury