Hydrogen is prepared on large scale for industrial use
by Zn + H2SO4
by Al + NaOH
by Na + C2H5OH
from water gas
D.
from water gas
Industrially, hydrogen is prepared from water gas which is a mixture of carbon monoxide and hydrogen, by removing carbon monoxide by
Bosch process or by liquefaction.
CO + H2O → CO2 + H2
When conc. H2SO4 comes in contact with sugar, it becomes black due to
hydrolysis
hydration
decolourisation
dehydration
The temperature of maximum density of H2O and D2O respectively are
0°C and 11.6°C
4°C and 0°C
4°C and 11.6°C
4°C and 12.5°C
A sample of gasoline contain 81% octane and 19% n-heptane. Its octane, number will be
19
81
100
62
The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to forma colourless solid from which hydrogen is released on treatment with water. The metal is
Al
Ca
Cu
Zn
Which is the correct statement?
Hydrogen peroxide can oxidise permanganate ion.
Permanganate ion can oxidise manganous ion.
Manganate ion is more stable than permanganate ion.
Permanganate ion cannot be reduced to manganate ion
Alum is a water purifier because it
coagulates the impurities
softens hard water
gives taste
destroys the pathogenic bacteria