Post Utme Chemistry Past Questions and Answers

Question 1166:

Consider the following compounds ____________
(i) \(CH _{3} CH _{2} C \left( CH _{3}\right)_{2} CH _{2} CH _{3}\)
(ii) \(CH _{3} CH _{2} CH _{2} CH _{3}\)
(iii) \(CH _{3} CH \left( CH _{3}\right) C \left( CH _{3}\right)_{2} CH _{3}\)
(iv) \(CH _{3} CH \left( CH _{3}\right) CH _{3}\).
The correct arrangement of the compounds in their increasing order of volatility is

A. Iv, ii, i, iii
B. Iii, i, ii, iv
C. Ii, i, iii, iv
D. Iii, i, iv, ii

Question 1167:

Which of the following is NOT a redox reaction?

A. \(2 HNO _{2}+2 HI \rightarrow 2 H _{2} O +2 NO + I _{2}\)
B. \(Zn + H _{2} SO _{4} \rightarrow ZnSO _{4}+ H _{2}\)
C. \(BaCl _{2}+2 AgNO _{3} \rightarrow 2 AgCl + Ba \left( NO _{3}\right)_{2}\)
D. \(4 FeO + O _{2} \rightarrow 2 Fe _{2} O _{3}\)

Question 1168:

Which of the following processes leads to increase in entropy?

A. Mixing of a sample of \(NaCl\) and sand
B. Condensation of water vapour
C. Boiling of a sample of water
D. Cooling a saturated solution

Question 1169:

Which one of the following statements is true?

A. Most solids have low densities
B. Most gases are ionic compound
C. Solids, like liquids and gases, do not have fixed shapes and fixed volumes
D. Gases do not have their own shape but rather expand to fill the shapes of their containers uniformly.

Question 1170:

A liquid begins to boil when ____________

A. Its volume if slightly decreased
B. Its vapour pressure is lower than the external pressure
C. Its vapour pressure equals the external pressure
D. Its molecules start escaping from the surface