High temperature thermometers use
sodium amalgam
an alloy of sodium and potassium
silver amalgam
calcium amalgam
Correct Answer :
B. an alloy of sodium and potassium
Related Questions
A substance used as a fire-extinguisher under the trade name of Pyrene is
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
Which of the following carbon compounds is used as a fire extinguisher?
Carbon disulphide
Chloroform
Carbon tetrachloride
Methylene chloride
Suspended impurities in water are effectively removed by
adding milk of lime
filtering through sand
adding filter alum
chlorination
Galvanised iron sheets are protected from rusting due to the presence of a layer of
lead
chromium
zinc
tin
The artificial silk produced from cellulose is
Polyethylene
Nylon
Terylene
Rayon
Artificial diamonds were produced by
Moissan
Davy
Faraday
Marie Curie
Solid carbon dioxide is used
as a drying agent
as a refrigerant
as an antiseptic
as a bleaching agent
Which of the following is not an alloy of copper?
Bronze
Brass
Solder
Gun metal
Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions
The gas which has a faint sweet odour is
nitrogen
nitrous oxide
nitric oxide
nitrogen peroxide
Ascorbic acid is the chemical name for
Vitamin B6
Vitamin C
Vitamin K
Vitamin D
In the mouth, starch is converted into ______ by the action of saliva.
sucrose
glucose
fructose
mannose
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
dehydration
oxidation
reduction
dehydrogenation
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
Which of the following is a Bleaching agent?
Potassium chlorate
Hydrogen peroxide
Copper sulphate
Silver Nitrate
Ozone occurs in the upper layers of air in the atmosphere because
it is lighter than air
in the lower layers it becomes unstable
ultra-violet light is present only in the upper layers
it mixes freely with O2 in the upper layers
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
Which or the following is not a constituent or gun powder?
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
Compounds containing only carbon and hydrogen are called
carbohydrates
carbides
hydrocarbons
carbonyls
A common rodenticide is (Rat Poison)
malathion
parathion
zinc phosphide
diuron
The purest form of carbon is
animal charcoal
coal
wood charcoal
sugar charcoal
Calamine is a ore of
tine
magnesium
zinc
copper
A mixture of naphthalene and sand is separated by
evaporation
using a magnet
sublimation
sedimentation
Which among the following is a local anaesthetic?
Chloroform
Morphine
Streptomycin
Cocaine
If people sleep in closed rooms where charcoal fire is burning, they die due to
carbon monoxide
carbon dioxide
methane
phosgene
Bordeaux mixture contains
copper sulphate and water
copper sulphate, lime and water
thio-urea and lime
copper sulphate and thio-urea
Rusting of iron cannot be prevented by
painting
applying alkaline phosphate
applying soap water
galvanising
In the nitrogen cycle, denitrifying bacteria
oxidise ammonia to nitrates
convert nitrogen into ammonia
oxidise ammonia to free nitrogen
oxidise ammonia to oxides of nitrogen
Proteins are polymerisation products of
aldehydes
alkenes
amino acids
alkynes
Lunar caustic is
calcium sulphate
ammonium chloride
caustic soda
silver nitrate