Marble is
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
Correct Answer :
A. calcium carbonate
Related Questions
Metals are usually heavy. A light metal is
manganese
copper
potassium
plumbum
High temperature thermometers use
sodium amalgam
an alloy of sodium and potassium
silver amalgam
calcium amalgam
The poisonous nature of carbon monoxide is due to
cutting off supply of oxygen
it™s being converted into carbon dioxide
its combination with haemoglobin of blood
its blocking of vocal chords
The modern system of symbols was evolved by
Dalton
Cavendish
Avogadro
Berzelius
Argyrol used as eye ointment is a solution of
hydrogen peroxide
silver nitrate
tincture iodine
m-cresol
The non-metal which is electropositive is
chlorine
nitrogen
sulphur
hydrogen
A drug that is usually administered for malaria is
sulphanilamide
quinine
methicillin
novocaine
Soda-water contains
sodium bicarbonate
sodium carbonate
carbonic acid
sodium hydroxide
Artificial diamonds were produced by
Moissan
Davy
Faraday
Marie Curie
An important use of nitrous acid is in
the manufacture of explosives
the manufacture of dyes
refrigerators
the preparation of drugs
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
A metal which exhibits allotropy is
cobalt
tin
manganese
platinum
A substance used both as an explosive and as a germicide is
phenol
TNT
picric acid
iodoform
Burglar proof safes are made of
Tungsten steel
Manganese steel
Chromium steel
Nickel steel
The noble gas which is present in microscopic quantities in air is
xenon
krypton
argon
helium
A metal which occurs 'free' in nature is
gold
zinc
tin
molybdenum
Diamonds are weighed in
grams
pounds
carats
tons
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
The most abundant constituent in air is
hydrogen
nitrogen
oxygen
noble gases
Brass contains
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
The substance preserved under water is
potassium
sodium
red phosphorus
white phosphorus
The sugar which is used in silvering mirrors is
sucrose
maltose
glucose
fructose
The alloy added in the preparation of steel contains
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
The form of carbon used in decolourising sugar solution is
wood charcoal
animal charcoal
coconut charcoal
lamp black
An acid which is used as a preservative for pickles is
hydrochloric acid
citric acid
tartaric acid
acetic acid
Which or the following is not a constituent or gun powder?
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
The gas used in balloons in the place of hydrogen is
nitrogen
helium
neon
argon
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
Cinnabar is an ore of
lead
zinc
mercury
chromium
The pure at form of iron is
wrought iron
steel
pig iron
nickel steel