The ore of iron is
Dolomite
Magnetite
Bauxite
Anglesite
Correct Answer :
B. Magnetite
Related Questions
The most abundant constituent in air is
hydrogen
nitrogen
oxygen
noble gases
Graphite la a good conductor of electricity because
it is an allotrope of carbon
it gives CO2 on heating
it contains free electrons
it is oxidised to graphitic acid
On chemical analysis, a bottle cork is found to contain primarily
proteins
carbohydrates
tannins
lipids
An acid which is used as a preservative for pickles is
hydrochloric acid
citric acid
tartaric acid
acetic acid
The non-metal which is electropositive is
chlorine
nitrogen
sulphur
hydrogen
The fertilizer which has the largest percentage of nitrogen is
urea
ammonium nitrate
ammonium sulphate
calcium cyanamide
Deficiency of iron causes
nervous disorders
heart diseases
anaemia
impairment of vision
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
Fructose is also called
dextrose
fruit sugar
beet sugar
blood sugar
A substance used as a fire-extinguisher under the trade name of Pyrene is
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
A drug that is usually administered for malaria is
sulphanilamide
quinine
methicillin
novocaine
The gas used in balloons in the place of hydrogen is
nitrogen
helium
neon
argon
The earliest known acid is
nitric acid
oxalic acid
carbonic acid
acetic acid
Which among the following is a metalloid?
Tin
Silver
Iodine
Arsenic
Cupellation is used in the purification of
Lead
Tin
Silver
Gold
Which of the following is not a food material?
silicate
protein
fat
carbohydrate
A compound used both as a fungicide and as a disinfectant is
chlorine
carbon monoxide
sulphur dioxide
o-cresol
What is 'oxygen mixture'?
A mixture of potassium nitrate and carbon
A mixture of ammonium chloride and sodium nitrate
A mixture of potassium chlorate and manganese dioxide
A mixture of ammonium nitrate and charcoal
A burning substance which continues to burn in a jar of carbon dioxide is
zinc
red phosphorus
magnesium
sulphur
Mild steel contains
iron with very low percentage of carbon
iron with high percentage of carbon
iron and chromium
iron and manganese
Radium was isolated from
galena
dolomite
sylvine
pitchblende
The purest form of carbon is
animal charcoal
coal
wood charcoal
sugar charcoal
The function of nitrogen in air is
to make air a moderate supporter of combustion
to maintain the density of air constant
to prevent the hydrogen in air from exploding
to reduce the poisonous nature of ozone in air
Marsh gas is
ethane
ethylene
acetylene
methane
Brine is a solution of
sodium chloride in water
iodine in alcohol
sulphur in carbon disulphide
Potassium iodide in water
Which one of the following is not radioactive?
Astatine
Francium
Tritium
Zirconium
Suspended impurities in water are effectively removed by
adding milk of lime
filtering through sand
adding filter alum
chlorination
Solid carbon dioxide (Dry ice) is also known as
Thiokol
Drikold
Perhydrol
Mannitol
Rooms in places infected by plague are disinfected using
bleaching powder
iodoform
sulphur dioxide
chlorine
Which of the following is not a characteristic of potable water?
It must be free from suspended impurities
It must be free from harmful bacteria
It must contain traces of sodium bicarbonate
It must have a fishy odour