The alloy which is extremely hard and resistant to acids is
chrome steel
silicon steel
stainless steel
invar
Correct Answer :
B. silicon steel
Related Questions
The purest form of carbon is
animal charcoal
coal
wood charcoal
sugar charcoal
The atomic number of an element represents
number of neutrons in the nucleus
number of protons and neutrons in the nucleus
the valency of the element
number of protons in the nucleus
The substance most abundantly found in sea water is
magnesium chloride
sodium chloride
calcium sulphate
potassium chloride
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
The freezing point of water at 760 mm pressure is
273 K
0 K
273°C
-273°C
The scientist who synthesised the first organic compound (urea) in the laboratory was
Wohler
Dalton
Lavoisier
Fischer
Sulphur is readily soluble in
Water
Alcohol
Carbon-di-sulphide
Sodium chloride solution
The term 'nucleons' apples to
neutrons
protons
protons and neutrons
protons and electrons
Even as early as 3000 BC glass was known to the
Europeans
Egyptians
Asians
Americans
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 not a metal?
Lithium
Helium
Sodium
Cobalt
A non-metal which is a good conductor of electricity is
graphite
phosphorus
sulphur
iodine
Cinnabar is an ore of
lead
zinc
mercury
chromium
In photography, the compound or nitrogen used is
Potassium nitrate
Silver nitrate
Ammonium carbonate
Ammonium bicarbonate
Which or the following is not a constituent or gun powder?
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
Mild steel contains
iron with very low percentage of carbon
iron with high percentage of carbon
iron and chromium
iron and manganese
A metal which is extracted by thermal reduction is
nickel
aluminium
mercury
calcium
Biogas is obtained during
decomposition of petrol
fermentation of animal and plant waste
destructive distillation of coal
electrolysis of water
Argyrol used as eye ointment is a solution of
hydrogen peroxide
silver nitrate
tincture iodine
m-cresol
Which of the following cannot be used as fuel?
Gasoline
Kerosene
Sulphuric acid
Alcohol
Which or the following gases is soluble in water and Is collected by the downward displacement or air?
Carbon dioxide
Sulphur dioxide
Ammonia
Hydrogen
Gold dissolves in aqua regia due to the formation of
chloro auric acid
auric chloride
gold nitrate
aurous chloride
Which of the following is a communicable disease caused by viruses?
Cholera
Dysentery
Diabetes
Measles
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 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
Galvanising is coating Iron with
nickel
zinc
chromium
copper
Smelling salt contains
ammonium chloride
ammonium carbonate
ammonium sulphate
potassium nitrate
Which of the following act a both u oxidising and reducing agent?
nitric acid
ammonia
nitrous acid
nitrogen peroxide
Marble is
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
The foul odour of gasoline is due to
pyridine
hydrogen sulphide
cacodyl
carbylamines