Solder is an alloy of
tin and copper
tin and lead
tin and zinc
tin, copper and zinc
Correct Answer :
C. tin and zinc
Related Questions
White vitriol is
ZnSO4 . 7H2O
FeSO4 . 7H2O
MgSO4 . 7H2O
CaSO4 . 2H2O
Physico-chemical characteristics of water in water sources undergo changes due to
aquatic macrophytes
aquatic fungi
effluents
evapotranspiration
One of the ingredients of the paste on the side of a match box is
phosphorus pentaoxide
phosphorus trichloride
phosphorus trisulphide
phosphorus trioxide
A form of carbon which is a good lubricant is
diamond
coke
graphite
charcoal
The process that takes place in the atom bomb is
nuclear' fusion
radioactive disintegration
nuclear fission
chemical decomposition
In the common soda-acid fire extinguisher, the fire is put out by
acid fumes
sodium bicarbonate
carbon dioxide
sodium carbonate
Iron is coated with zinc to prevent rusting. The process is called
annealing
tempering
calcining
galvanising
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
Methylated spirit is a mixture of
methyl alcohol and acetic acid
methyl alcohol and ethyl alcohol
ethyl alcohol and pyridine
methyl alcohol and pyridine
A burning substance which continues to burn in a jar of carbon dioxide is
zinc
red phosphorus
magnesium
sulphur
Fructose is also called
dextrose
fruit sugar
beet sugar
blood sugar
Grape sugar is another name for
glucose
fructose
sucrose
maltose
A valuable by-product in the manufacture of soap is
stearic acid
sodium hydroxide
palmitic acid
glycerol
A non-material kind of pollution is
land pollution
air pollution
noise pollution
water pollution
Which of the following represents a physical change?
sublimation
oxidation
reduction
decomposition
The principle involved in dialysis, a treatment administered to patients with affected kidneys is
Cataphoresis
Osmosis
Dehydration
Diffusion
Isotopes differ in the number of
Protons
Neutrons
Electrons
Protons and electrons
Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
three
four
one
five
The sugar which is used in silvering mirrors is
sucrose
maltose
glucose
fructose
Iron is rendered passive by
conc. H2SO4
conc. HCl
conc. HNO3
acetic acid
Ethyl alcohol is
a deliquescent substance
an efflorescent substance
a hygroscopic substance
a dehydrating substance
A hormone which contains iodine is
adrenalin
glucagon
epinephrin
thyroxin
Which one of the following metals is used to extract another metal?
Lead
Tin
Zinc
Aluminium
Which of the following is a mixture?
Baking soda
Milk
Chloroform
Copper wire
A mixture of naphthalene and sand is separated by
evaporation
using a magnet
sublimation
sedimentation
Vinegar is an aqueous solution of
oxalic acid
citric acid
acetic acid
hydrochloric acid
Beri-beri is caused by deficiency of Vitamin
A
C
B12
B1
The Carbon dioxide is absorbed by
Palladium
NaCI
KOH
Dilute H2SO4
According to the modern Periodic Law, the properties of elements are periodic functions of their
valency
atomic mass
number of neutrons
atomic number
Which of the following is not a physical change?
Distillation of water
Action of heat on potassium chlorate
Powdering of glass
Burning of an electric lamp