Jamb 1992 Chemistry Past Questions And Answers
The carbon atoms in ethene are?
- A. sp3 hybridized
- B. sp hybridized
- C. sp2 hybridized
- D. not hybridized
Which of the following are isomers?
- A. Ethanol and dimethyl ether
- B. Benzene and methybenzene
- C. Ethanol and propanone
- D. Trichloromethane and tetrachloromethane
An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?
- A. number of molecules of the gas
- B. density of the gas molecules
- C. number of collisions between the gas molecules
- D. number of collisions between the gas molecules and the walls of the container
The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO3 is?
- A. hydroxyl group
- B. carboalkoxyl group
- C. carbonyl group
- D. carboxyl group
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
- A. 2.0 moles
- B. 1.0 moles
- C. 0.5 mole
- D. 0.25 mole
Alkanals can be differentiated from alkanones by reaction with?
- A. 2,4-dinitrophenylhydrazine
- B. hydrogen cyanide
- C. sodium hydrogen sulphite
- D. Tollen's reagent
Safety matches contain sulphur and?
- A. potassium trioxochlorate (V)
- B. potassium trioxonitrate (V)
- C. charcoal
- D. phosphorus sulphide
On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure
- A. I, II, III and IV
- B. I and II only
- C. II only
- D. I, III and IV only
The characteristics reaction of carbonyl compounds is?
- A. substitution
- B. elimination
- C. addition
- D. saponfication
In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?
- A. The additional of the two is expected to be one
- B. The product of the two is expected to be one
- C. The two equilibrium constants are identical
- D. The product of the two is always greater than one