Starch can be converted to ethyl alcohol by
distillation
fermentation
isomerization
cracking
cooking
Correct answer is B
No explanation has been provided for this answer.
dissolving it in water, recrystallizing it and then drying in the oven
passing it through a concentrated aqueous solution of sodium hydroxide
passing it through calcium oxide
passing it through concentrated sulphuric acid
passing it through anhydrous calcium choride
Correct answer is C
No explanation has been provided for this answer.
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
SO 2 + 2HNO3 →H2SO4 + NO2 + Heat
2SO2 + 2H2O + O2→ 2H2SO4
SO2 + 2H2O + CI2→ H2SO4 + 2HCI
SO2 + 2H2S → 3S + 2H2O
SO2 + H2O → H2SO3
Correct answer is D
No explanation has been provided for this answer.
a compound wich has no water of crystallization
an oxide whose solution in water has a PH greater than 7
an oxide whose solution in water has a PH less than 7
an oxide that has hydrogen atoms
an amphoteric oxide
Correct answer is A
No explanation has been provided for this answer.
In the redox reaction\( 2Fe^{2+} + CI_2 → 2Fe^{3+} + 2Cl^-\)
Cl2 is reduced because it has lost electrons
Cl2 is reduced because its oxidation number has decreased
Cl2 is reduced because its molecule is change to two ions
Fe2+ is reduced because it has lost electrons
Fe2+ is reduced because it has gained electrons
Correct answer is B
decrease in oxidation number indicates reduction while an increase in oxidation number indicates oxidation hence chloride gas is reduced because its oxidation number changed from o to -1