Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
Correct Answer :
D. iso-octane
Related Questions
The non-metal which is electropositive is
chlorine
nitrogen
sulphur
hydrogen
Rooms in places infected by plague are disinfected using
bleaching powder
iodoform
sulphur dioxide
chlorine
Proteins are polymerisation products of
aldehydes
alkenes
amino acids
alkynes
The earliest name given to nitrogen was
dephlogisticated air
azote
inflammable air
marine acid air
Which or the following gases is soluble in water and Is collected by the downward displacement or air?
Carbon dioxide
Sulphur dioxide
Ammonia
Hydrogen
The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by
A - Z
A + Z
Z
A
Which of the following is an essential constituent of acids?
Oxygen
Nitrogen
Hydrogen
Chlorine
Clark's method for removal of temporary hardness in water uses
calcium hydroxide
washing soda
calcium chloride
zeolite
Which of the following statements regarding natural radioactivity is true?
It is spontaneous disintegration of atoms
It is induced by bombardment with projectiles
It is transmutation of atoms with projectiles
It is dependent on temperature
Which among the following is a metalloid?
Tin
Silver
Iodine
Arsenic
The artificial silk produced from cellulose is
Polyethylene
Nylon
Terylene
Rayon
Marble is
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
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
Iodine in alcohol is known as
quick lime
tincture iodine
rectified spirit
None of these
An acid which is used as a preservative for pickles is
hydrochloric acid
citric acid
tartaric acid
acetic acid
Annealing of glass is carried out by
rapid cooling
rapid heating
slow cooling
slow heating
Which one of the following gases is extremely soluble in water?
Carbon dioxide
Ammonia
Chlorine
Hydrogen sulphide
________ is left behind after distillation of petroleum.
Arsenic
Barium
Benzene
Bitumen
Which of the following biology laboratory?
Phenol
Benzaldehyde
Formaldehyde
Acetic acid
Which of the following is not an alloy of copper?
Bronze
Brass
Solder
Gun metal
Soda-water contains
sodium bicarbonate
sodium carbonate
carbonic acid
sodium hydroxide
Which of the following metals is the best conductor of heat and electricity?
Aluminium
Silver
Copper
Magnesium
Optical instruments are made of
pyrex glass
flint glass
quartz glass
Crooke's glass
The kinetic energy of gas molecules
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
An element which is preserved under water is
Sodium
red phosphorus
white phosphorus
sulphur
Cinnabar is an ore of
lead
zinc
mercury
chromium
The iron salt used in blue prints is
ferric sulphate
ferric oxalate
ferric nitrate
ferric chloride
The oldest known organic compound is
urea
methane
acetic acid
benzene
Radium was isolated from
galena
dolomite
sylvine
pitchblende
The most abundant constituent in air is
hydrogen
nitrogen
oxygen
noble gases