The following properties are characteristics of transition elements except
- A. formation of complex ions
- B. fixed oxidation states
- C. formation of coloured compounds
- D. catalytic abilities
Which of the following elements has the electronic configuration:1s22s22p63s23p1? [11Na, 13A1,
14N,16S]
- A. Al
- B. Na
- C. N
- D. S
How many orbitals are associated with the p-sub energy level?
- A. 2
- B. 3
- C. 5
- D. 6
Consider the reaction represented by the equation: 23892U + 10 → 139 56Ba + 94 36Kr + 31 0n. The reaction represents a
- A. nuclear fission
- B. nuclear fusion
- C. radioactive decay
- D. spontaneous disintegration
If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X, calculate the relative atomic mass of X
- A. 9.6
- B. 10.6
- C. 11.6
- D. 20.0
Which of the following scientists discovered the neutron?
- A. Ernest Rutherford
- B. J.J Thompson
- C. James Chadwick
- D. R. A. M illikan
Which of the following alloys is mainly used in making statues?
- A. Brass
- B. Bronze
- C. Duralumin
- D. Steel
Aluminium is a good roofing material because it
- A. is strong and does not conduct heat and electricity
- B. readily absorbs light
- C. forms an oxide film over its surface which prevents corrosion
- D. is flexible and can conduct heat
Chemicals that are produced in small quantities and with very high degree of purity are
- A. bulk chemicals
- B. fine chemicals
- C. heavy chemicals
- D. light chemicals
Which of the following substances causes the depletion of the ozone layer in the atmosphere?
- A. Carbon (IV) oxide
- B. Chlorofluorocarbon
- C. Sulphur (IV) oxide
- D. Hydrocarbons
A solution of a salt was acidified with HCI when a few drops of BaCI2 solution were added, a white precipitate was formed. Which of the following anions is present in the salt?
- A. CO2- 3
- B. NO- 3
- C. SO2- 4
- D. SO2- 3
A hydrocarbon containing 88.9% carbon has the empirical formula [H = 1 C = 12]
- A. CH
- B. CH2
- C. C2H3
- D. C2H5
Arrange the following compounds in order of increasing boiling point
l.CH 3CH2CH2OH
II.CH 3CH 2OH
III.CH3CH2CH2CH2OH
IV. CH3CH 2CH2CH 2CH 3
- A. I < II < IV < III
- B. IV < III < II < I
- C. I < II < III < IV
- D. IV < I < II< III
What is the main type of reaction alkenes undergo?
- A. Addition
- B. Condensation
- C. Elimination
- D. Substitutio
The hydrolysis of groundnut oil by potassium hydroxide is known as
- A. hydrogenation
- B. saponification
- C. esteriffication
- D. neutralization
When ethanol is heated with excess concentrated tetraoxosulphate (VI) acid, the organic product formed is
- A. ethanal
- B. ethanoic acid
- C. ethane
- D. ethene
Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution?
- A. CH3 C≡CCH3
- B. HC≡CH
- C. CH3C≡CH
- D. CH3CH2C≡CH
A mixture of kerosene and diesel oil can be separated by
- A. crystallization
- B. distillation
- C. precipitation
- D. sublimation
Calculate the quantity of electricity passed when 0.4 A flows for 1 hour 20 minutes through an electrolytic cell
- A. 4800C
- B. 3840 C
- C. 1920 C
- D. 32 C
Oxidation takes place at the anode during electrolysis because the anode
- A. is deficient in electrons
- B. is deficient in protons
- C. has excess electrons
- D. has attraction for positive ions