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
A commercial sample of hydrogen peroxide is labelled as is volume. Its percentage strength is nearly
1%
3%
10%
90%
In the reaction, 2FeSO4 + H2SO4 + H2O2 → Fe2(SO4)3 + 2H2O the oxidising agent is
FeSO4
H2SO4
H2O2
methyl cyclopentane