Past Questions And Answers
(a)(i) List three properties of elements which increase generally across a period in the Periodic Table,
(ii) Give two differences between a chemical reaction and a nuclear reaction.
(b) Use the information provided in the table below to answer Questions (i) - (vii).
Atom of Element | P | Q | R | S | T |
Mass Number | 16 | 40 | 35 | 18 | 20 |
Atomic Number | 8 | 20 | 17 | 8 | 10 |
Which of the atoms in the table above:
(i) are isotopes of the same element?;
(ii) contains 18 neutrons?;
(iii) is chemically unreactive?;
(iv) readily forms an ion with two positive charges?
(v) attain an octet structure by accepting one electron?;
(vi) forms ionic bond with R?;
(vii) belongs to the s-block in the Periodic Table?
(c) Describe in outline how each of the following conversions can be carried out in the laboratory. Write appropriate equations for the reactions involved in each case
(i) CuCO\(_3\) to Cu
(ii) MgO to MgSO\(_4\).
View Discussion (0)WAEC 2000 THEORYWhich of the following is most ideal when cow dies due to anthrax disease?
- A. bury or burn the carcass of the dead animal immediately
- B. slaughter all other animal in the herd
- C. cull the close relations of the dead animal
- D. fumigate all pens
In Hadith 6 of an Nawawi’s collection, the Prophet(SAW) said the lawful and unlawful are all clear, but between them are
- A. things prohibited
- B. things permitted
- C. ambiguous matters
- D. lump of flesh.
From the words lettered A to D, choose the word that best completes each of the following sentences.
The team manager looked.......when his boys lost the match
- A. down
- B. denied
- C. dejected
- D. deserted
Money that a government required to be accepted in settlement of debts is
- A) commodity money
- B) currency value
- C) barter
- D) legal tender
The following are types of errors in programming except?
- A. grammar error.
- B. syntax error.
- C. logic error.
- D. arithmetic error.
Pin
- A. Psychology
- B. Pneumonia
- C. Pseudonym
- D. Pragmatic
The delta of the River Nile is best described as
- A. bird's foot
- B. estuarine
- C. arcuate
- D. lacustrine
Find the value of x if \( [ 1 ÷ 64^{(x + 2)}]= [4^{(x − 3)} ÷ 16^x ] \)
- A. \( \frac{3}{2} \)
- B. \( \frac{2}{3} \)
- C. \( \frac{1}{3} \)
- D. \( -\frac{3}{2} \)
Evaluate \(\frac{\frac{1}{10}\times\frac{2}{3}+\frac{1}{4}}{\frac{\frac{1}{2}}{\frac{3}{5}}-\frac{1}{4}}\)
- A. \(\frac{7}{12}\)
- B. \(\frac{19}{35}\)
- C. \(\frac{2}{25}\)
- D. \(\frac{19}{60}\)