Post Utme Chemistry Past Questions and Answers

Question 51:

The formation of ozone by reaction of \(\mathrm{O}_{2}\) with atomic oxygen in UV light occurs in ____________

A. Upper atmosphere
B. Inner atmosphere
C. Stratosphere
D. Hemisphere
E. None of these

Question 52:

The halogen which is chiefly produced commercially from sea water is ____________

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
E. Astatine

Question 53:

The oxidizing agent in the reaction, \(3 \mathrm{Br}_{2}+6 \mathrm{OH}^{-}=\mathrm{BrO}_{3}^{-}+5 \mathrm{Br}^{-}+3 \mathrm{H}_{2} \mathrm{O}\) is ____________

A. \(\mathrm{Br}_{2}\)
B. \(\mathrm{OH}-\)
C. \(\mathrm{A}\) \(\mathrm{BrO}_{3}-\)
D. \(\mathrm{e}^{-}\)
E. \(\mathrm{H}_{2} \mathrm{O}\)

Question 54:

When heat is absorbed during a chemical reaction, the reaction is said to be ____________

A. Thermodynamic
B. Exothermal
C. Isothermal
D. Endothermic
E. Thermostatic

Question 55:

Given the reaction at equilibrium: \(2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \leftrightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})\) When the reaction is subjected to \(C\) stress, a change will occur in the concentration of ____________

A. Reactants, only
B. Products, only
C. Both reactants and products
D. Neither reactants nor products