Post Utme Chemistry Past Questions and Answers

Question 536:

If sulphur (IV) oxide and methane are released simultaneously at the opposite ends of a narrow tube, the rates of diffusion RSO², and RCH⁴ will be in the ratio ____________
(8 =32, O = 12, H =1)

A. 4:1
B. 2:1
C. 1:12
D. 1:4

Question 537:

The soil around a battery manufacturing factory is likely to contain a high concentration of ____________

A. Ca²⁴ slats
B. Pb²⁺ salts
C. Mg²⁴ salts
D. A¹³⁺ salts

Question 538:

The pH of a solution obtained by mixing 100cm³ of a MHCL solution with 100cm³ of a 0.2M solution of NAOH is ____________

A. 1.3
B. 7.0
C. 9.7
D. 12.7

Question 539:

What mass of gold is deposited during the electrolysis of gold (III) tetraoxosulphate (VI) when current of 15 A is passed for 193 seconds?
(Au = 97, F =96500C)

A. 1.97g
B. 3.94g
C. 5,91g
D. 19.70g

Question 540:

A common characteristic shared b by iron and, aluminum is that both ____________

A. Are exacted by electrolysis
B. Form only basic oxides
C. Show oxidation states of +2 and + 3
D. Form soluble hydroxide