Question 486:

• JAMB 1986

In the electrolysis of aqueous solution of K₂SO ₄ in the above cell, which species migrate to the anode?

A. SO^2-OH ^-
B. K ⁺ and SO ₄^2-
C. OH and HO
D. H₃O ⁺ and K

Question 487:

• JAMB 1986

The tabulated results below were obtained by titration 10.0 cm₃ of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

A. 1.5
B. 1.4
C. 4.1
D. 5.1

Question 488:

• JAMB 1986

Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?

A. A
B. B
C. C
D. D

Question 489:

• JAMB 1986

10cm³ of hydrogen fluoride gas react with 5cm³ of dinitrogen difluoride gas (N²F₂) to form 10₃ of a single gas. Which of the following is the most likely equation of the reaction?

A. HF + N₂F₂ \(\to\) N₂HF₃
B. 2HF + N₂F₂ \(\to\) 2NHF₂
C. 2HF + N₂F₂ \(\to\) N₂H₂F₃
D. HF + 2N₂F₂ \(\to\) N₄HF₂

Question 490:

• JAMB 1986

The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 10²³]

A. 6.02 x 10²²
B. 5.85 x 10²³
C. 6.02 x 10²³
D. 5.85 x 10²⁴