Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
Aluminium
Chromium
Nickel
Tungsten
Correct Answer :
B. Chromium
Related Questions
Diamonds are weighed in
grams
pounds
carats
tons
Consider the following statements: Hard water is not suitable for
1) drinking
2) washing clothes with soap
3) use in boilers
4) irrigating crops
Which of these statements are correct?
1 and 3
2 and 3
1, 2 and 4
1, 2, 3 and 4
Biogas is obtained during
decomposition of petrol
fermentation of animal and plant waste
destructive distillation of coal
electrolysis of water
Which of the following is used in fuel to propel rockets?
Petrol
Kerosene
Hydrazine
Alcohol
A substance used as a fire-extinguisher under the trade name of Pyrene is
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
Solder is an alloy of
tin and copper
tin and lead
tin and zinc
tin, copper and zinc
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
The depletion of the ozone layer in the upper atmosphere is due to -extensive use of
dichloro-phenoxy-acetic acid
superphosphate of lime
chlorofluorocarbons (CFC)
dichloro-diphenyl-trichloro-ethane
Gases have
a definite shape but not volume
a definite volume and shape
a definite volume but not shape
neither definite volume nor shape
A mixture of ethyl alcohol and water can be separated by
evaporation
sublimation
using a separating funnel
fractional distillation
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
On chemical analysis, a bottle cork is found to contain primarily
proteins
carbohydrates
tannins
lipids
Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
three
four
one
five
The kinetic energy of gas molecules
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
Flint glass contains
potassium and lead silicates
zinc and barium borosilicates
potassium and calcium silicates
sodium and calcium silicates
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
Hydrogen gas has
a very sweet smell
a very pungent smell
an irritating smell
no smell at all
A mixture of naphthalene and sand is separated by
evaporation
using a magnet
sublimation
sedimentation
Which of the following is not a food material?
silicate
protein
fat
carbohydrate
Which among the following is a metalloid?
Tin
Silver
Iodine
Arsenic
Which one of the following gases is extremely soluble in water?
Carbon dioxide
Ammonia
Chlorine
Hydrogen sulphide
Jeweller's rouge is
magnetic oxide of iron
ferric oxide
ferrous oxide
ferrous carbonate
Boiler scales' contain
calcium carbonate
magnesium bicarbonate
calcium sulphate
magnesium sulphate
Fructose is also called
dextrose
fruit sugar
beet sugar
blood sugar
According to the modern Periodic Law, the properties of elements are periodic functions of their
valency
atomic mass
number of neutrons
atomic number
Which one of the following is used in dry cleaning of garments?
asphalt
naphtha
diesel oil
lubricating oil
One method by which the components of air can be separated is
shaking with caustic soda solution
shaking with water
fractional distillation of liquid air
passing air over heated magnesium
Calamine is a ore of
tine
magnesium
zinc
copper
Which of the following process involves removal of the elements of water?
Hydrolysis
Hydrogenation
Dehydration
Dehydrogenation
Two or more entirely different compounds having the same molecular formula are known as
isobars
isotopes
isomorphs
isomers