The atomic number of an element represents
number of neutrons in the nucleus
number of protons and neutrons in the nucleus
the valency of the element
number of protons in the nucleus
Correct Answer :
D. number of protons in the nucleus
Related Questions
The alloy which is extremely hard and resistant to acids is
chrome steel
silicon steel
stainless steel
invar
Acute diabetes patients smell of
acetone
ether
ethyl alcohol
methyl alcohol
Washing soda is
sodium hydroxide
sodium carbonate
sodium bicarbonate
potassium chloride
Colour blindness is
a congenital disease
a communicable disease
an acquired disease
a contagious disease
An example of thermo setting plastics is
bakelite
polythene
PVC
Teflon
Artificial diamonds were produced by
Moissan
Davy
Faraday
Marie Curie
The fertilizer which has the largest percentage of nitrogen is
urea
ammonium nitrate
ammonium sulphate
calcium cyanamide
A form of carbon which is a good lubricant is
diamond
coke
graphite
charcoal
Which or the following gases is soluble in water and Is collected by the downward displacement or air?
Carbon dioxide
Sulphur dioxide
Ammonia
Hydrogen
Physico-chemical characteristics of water in water sources undergo changes due to
aquatic macrophytes
aquatic fungi
effluents
evapotranspiration
Gasoline is obtained from crude petroleum by
fractional distillation
fractional crystallisation
sublimation
evaporation
Nylon is made from
terephthalic acid and ethylene glycol
hexamethylene diamine and adipic acid
cellulose nitrate
cellulose acetate
The compound or nitrogen used in dry cells is
ammonia
ammonium nitrate
ammonium chloride
ammonium nitrite
Brass contains
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
Laughing gas is
nitric oxide
nitrogen peroxide
nitrogen pentoxide
nitrous oxide
Mild steel contains
iron with very low percentage of carbon
iron with high percentage of carbon
iron and chromium
iron and manganese
Cholesterol is
a carbohydrate
a protein
a lipid
a hormone
The gas used in balloons in the place of hydrogen is
nitrogen
helium
neon
argon
During fermentation, the by-product is
ethyl alcohol
methyl alcohol
carbon monoxide
carbon dioxide
Optical instruments are made of
pyrex glass
flint glass
quartz glass
Crooke's glass
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
The compound which is both an antiseptic and a disinfectant is
phenol
iodoform
bleaching powder
blue vitriol
An important use of nitrous acid is in
the manufacture of explosives
the manufacture of dyes
refrigerators
the preparation of drugs
Plaster of Paris
contracts while setting
expands while setting
is highly volatile
does not suffer any changes in volume while setting
A metal which is extracted by thermal reduction is
nickel
aluminium
mercury
calcium
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
The most abundant noble gas present in air is
neon
argon
helium
krypton
Which among the following is a metalloid?
Tin
Silver
Iodine
Arsenic
Which of the following is used as an illuminant?
Gasoline
Benzoline
Kerosene
Petroleum ether
Which of the following is baking soda?
Na2CO3 . 10H2O
NaHCO3
Na2CO3 . H2O
NH4CI