Lead pencils contain
white lead
graphite
red lead
coke
Correct Answer :
B. graphite
Related Questions
Smelling salt contains
ammonium chloride
ammonium carbonate
ammonium sulphate
potassium nitrate
Gasoline is obtained from crude petroleum by
fractional distillation
fractional crystallisation
sublimation
evaporation
Calamine is a ore of
tine
magnesium
zinc
copper
Flint glass contains
potassium and lead silicates
zinc and barium borosilicates
potassium and calcium silicates
sodium and calcium silicates
Iron is coated with zinc to prevent rusting. The process is called
annealing
tempering
calcining
galvanising
The term 'nucleons' apples to
neutrons
protons
protons and neutrons
protons and electrons
Compounds of nitrogen with metals are called
nitrates
nitrites
hyponitrates
nitrides
Water has an unusually high bolling point because
its molecular weight is low
it is denser than ice
it is a good solvent for many ionic substances
the molecules of water are joined by hydrogen bonds
In photography, the compound or nitrogen used is
Potassium nitrate
Silver nitrate
Ammonium carbonate
Ammonium bicarbonate
The presence of dust particles in air serves
as a nucleus to condense water vapour resulting in rain
to maintain the average density of air
to minimise the inflammatory nature of oxygen
to protect the inhabitants of the earth from the effects of ultra violet rays.
Soda-water contains
sodium bicarbonate
sodium carbonate
carbonic acid
sodium hydroxide
On chemical analysis, a bottle cork is found to contain primarily
proteins
carbohydrates
tannins
lipids
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
In the process of purification of water for town supply, the substance used to remove bad smell and colour from water is
charcoal
bleaching powder
chlorine
carbolic acid
Grape sugar is another name for
glucose
fructose
sucrose
maltose
The alloy added in the preparation of steel contains
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
Burglar proof safes are made of
Tungsten steel
Manganese steel
Chromium steel
Nickel steel
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
Ascorbic acid is the chemical name for
Vitamin B6
Vitamin C
Vitamin K
Vitamin D
Oxalic acid is used in the manufacture of
tincture iodine
paints
ink
aerated water
Penicillin was discovered by
Alexander Fleming
Sir JJ Thomson
Dr Nessler
Sir John Russel
Setting of cement is due to
hydration
dehydration
dialysis
osmosis
An example of stimulant fertilizer is
gypsum
urea
potassium nitrate
ammonium phosphate
The raw materials used in the manufacture of cement are
brimstone and silica
limestone and clay
brimstone and clay
brimstone and limestone
Acute diabetes patients smell of
acetone
ether
ethyl alcohol
methyl alcohol
Which of the following elements is not required for the healthy growth of plants?
Nitrogen
Phosphorus
Potassium
Mercury
Boiler scales' contain
calcium carbonate
magnesium bicarbonate
calcium sulphate
magnesium sulphate
Lead soaps are used in
shaving creams
adhesive tapes
toilet powders
lubricants
Calomel is
lead chloride
mercurous chloride
mercuric chloride
calcium sulphate
Which of the following biology laboratory?
Phenol
Benzaldehyde
Formaldehyde
Acetic acid