The reaction of an alkanol with alkanioc acid is known as
- A. dehydration
- B. esterification
- C. halogenation
- D. hydrogenation
- E. saponification
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
- A. CH2
- B. CH3
- C. C2H2
- D. C2H4
- E. C2H6
Which of the following statements is NOT correct of group VII elements? They
- A. are diatomic
- B. are good oxidizing agents
- C. are highly electronegative
- D. have high electron affinity
- E. have relatively low ionization potentials
Which of the following is NOT a fraction of petroleum?
- A. Bitumen
- B. Coal
- C. Diesel
- D. Kerosene
- E. Petrol
The scientist who discovered the zig-zag movement of gas molecules is
- A. Brownian
- B. Dalton
- C. Gay Lussac
- D. Graham
- E. Newton
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
- A. HOCH2 – CH2OH
- B. H2C –C =C– CH3
- C. H3C – HC = CH2
- D. H2C = CH2
- E. H3C – C =CH
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]
- A. CH
- B. CH3
- C. CH4
- D. C2H2
- E. C2H6
Which of the following non-metals reacts most readily with metals?
- A. Carbon
- B. Chlorine
- C. Nitrogen
- D. Phosphorus
- E. Sulphur
Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group
- A. alkanal
- B. alkane
- C. alkanoate
- D. alkene
- E. alkyne
The process involved in the decomposition of sugar by an enzyme is called
- A. dehydration
- B. esterification
- C. fermentation
- D. polymerization
- E. saponification
Which of the following equations is NOT balanced?
- A. CH4(g) + 202(9) → CO2(g) + 2H2O(g)
- B. CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)
- C. 2KCIO3(s) → 2KCI(s)+ 3O2(g)
- D. NaH(s) + H2O(1) → NaOH(aq) +H2(g)
- E. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
- A. ammonia
- B. carbon(IV)oxide
- C. hydrogen chloride
- D. sulphur (IV) oxide
- E. sulphur (VI) oxide
In which of the following equations can Le-chartelier’s principle be applied?
- A. H2(g)+S(g) → H2(g)
- B. 2H2S(g) + O2 (g) → 2H2O(l) + 2SO2(g)
- C. N2(g) +3H2(g) ⇌ 2NH3(g)
- D. NaOH(aq) +CO2(g) → Na2CO3(aq) + H2O(l)
- E. S(s) + 02(g) → SO2(g)
In which of these groups will all the substances be insoluble in water?
- A. Na2CO3, KNO3,(NH4)2C03
- B. NaHCO3, PbSO4, CaSO4
- C. K2C03, CaSO4, AgNO3
- D. PbCl2, NaCl, ZnCl2
- E. ZnCO3, BaSO4,AgCl
What is the maximum number of electrons that an f-orbital can accommodate?
- A. 2
- B. 6
- C. 7
- D. 10
- E. 14
A measure of the degree of disorderliness in a chemical system is known as the
- A. activation energy
- B. enthalpy
- C. entropy
- D. equilibrium
- E. free energy.
A substance is said to be hygroscopic when it
- A. absorbs atmospheric moisture and then goes into solution
- B. absorbs atmospheric moisture but does not go into solution
- C. changes colour
- D. is not affected by atmospheric moisture
- E. losses its water of crystallization
The electrode potential in volts of 2H\(^+\)(aq) / H\(_2\)(q) system is
- A. -2.87
- B. -2.71
- C. 0.8
- D. 1.68
- E. \( 0 \)
Chromatography is used to separate components of mixtures which differ in their rates of
- A. diffusion
- B. migration
- C. reaction
- D. sedimentation
- E. sublimation.
During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because
- A. hydrogen ions are in greater concentration than sodium ions.
- B. hydrogen is higher than sodium in the electrochemical series.
- C. hydrogen is lower than sodium in the electrochemical series.
- D. of the nature of the electrodes.
- E. the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.
Which of these is NOT a physical property f water?
- A. Can be used to dissolve organic substances
- B. Has a boiling point of 100 ° C
- C. Has a density of 19cm3 at 40 °C
- D. Has a freezing point of 0 ° C
- E. is neutral to litmus