Chemistry Past Questions And Answers
Which of the following arrangements is in decreasing order of atomic radius?
- A. Li>Be>C>
- B. Li>B>Be>C
- C. Li>Be>B>C
- D. C>B>Be>Li
Given the change of phase: CO2(g) changes to CO2(s), the entropy of the system
- A) decreases
- B) increases
- C) remains the same
- D) all of the above
What type of reaction occurs between vegetable oil and plant ash extract?
- A. Displacement
- B. Dehydration
- C. Neutralization
- D. Saponiflication
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
- A. CH3CH2OH
- B. (CH3)2CHCH2OH
- C. (CH3)3CCH2OH
- D. (CH3)3COH
Na2CO3+ 2HCl →2NaCl + H2O + CO2 The indicator most suitable for this reaction should have a pH equal to
- A) 5
- B) 7
- C) 3
- D) 9
Which of the following non-metals reacts most readily with metals?
- A. Nitrogen
- B. Chlorine
- C. Sulphur
- D. Carbon
Which of the following elements has its valence electrons in the s-orbital?
- A. Aluminum
- B. Phosphorus
- C. Sodium
- D. Carbon
Calculate the volume of 0.5 mol dm-3 H2So4 that is neutralized by 25 cm-3 of 0.1 mol dm-3 NaOH
- A) 5.0 cm3
- B) 2.5 cm3
- C) 0.4 cm3
- D) 0.1 cm3
Sulphur
- A) forms two alkaline oxides
- B) is spontaneously inflammable
- C) bums with a blue flame
- D) conducts electricity in the molten state
(a) What is the IUPAC name of Fe\(_2\)(SO\(_4\))\(_3\)?
(b)(i) Write an equation to represent the reaction of hydrogen sulphide with iron (III) chloride solution.
(ii) Mention one change observed during the reaction in (b)(i) above.
View Discussion (0)WAEC 1998 THEORY