Which of the following compounds can be represented by the molecular formula C2 H6O?
propanal
ethanol
methanoic acid
glucose
Correct answer is B
Ethanol has the molecular formula C2H6O. Option A, C, D are not because their molecular are not different
If glucose is heated with concentrated tetraoxosulphate(vi)acid, it will be dehydrated to?
carbon
carbon(iv)oxide
ethane
ethanol
Correct answer is A
Carbon concentration of 4 will not give a precipitate heating. Option B,C,D will not be dehydrated
oxygen
chlorine
nitrogen
hydrogen
Correct answer is A
Oxygen is a substance that is used to remove impurities from pig iron. Options B, C, D will be effective in removing impurities positive]
In countries where the temperature fall below 273k, salt always spilled on the road in order to
increase the boiling point
increase the density of the ice
make the ice impure
reduce the freezing point of ice
Correct answer is D
No explanation has been provided for this answer.
Electronic configuration of an element 13 in the subsidiary energy level is
\( 1s^2 2s^2 2p^6 3s^2 3p^1 \)
\( 1s^22s^2 2p^4 3p^1 3s^1 \)
\( 1s^2 2s^2 2p^6 3s^2 3p^3 \)
\( 1s^1 2s^2 2p^6 3s^2 3p^4 \)
Correct answer is A
No explanation has been provided for this answer.