How many unpaired electron(s) are there in the nitrogen sub-levels/
A noble gas with a high power of fog penetration used in aerodrome beacons is
Carbon (II) oxide is considered dangerous if inhaled mainly because it
A. can cause injury to the nervous system
B. competes with oxygen in the blood
C. competes with carbon (IV) oxide in the blood
D. can cause lung cancer
6AgNO4(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(g) + 6HNO3(aq)
In the above reaction, the reducing agent is
If a reaction is exothermic and there is a great disorder, it means that
A. the reaction is static
B. the reaction is in a state of equilibrium
C. there will be a large increase in free energy
D. there will be a large decrease in free energy
Which of the following is used in rocket fuels?
The residual solids from the fractional distillation of petroleum are used as
A. coatings of pipes
B. raw materials for the cracking process
C. fuel for the driving tractors
D. fuel for jet engines
Which of the following is used to hasten the ripening of fruit?
Two hydrocarbons X and Y were treated with bromine water. X decolorised the solution and Y did not not. Which class of compound does Y belong?