Post Utme Chemistry Past Questions and Answers

Question 496:

\({ }_{55}^{116} C s \longrightarrow{ }_{7}^{A} E+{ }_{2}^{4} \alpha\).

Find the value of \(A\) and \(Z\) in the equation above

A. 119,53
B. 110,57
C. \(110.53\)
D. 110,58

Question 497:

How many moles of \(H _{2}\) molecules are needed to convert 5 mol of \(O _{2}\) molecules to water?

A. \(5 mol H\)
B. \(10 mol H\)
C. \(15 mol H _{2}\)
D. \(20 mol H _{2}\)

Question 498:

\({ }_{\pi M}^{226} R a \rightarrow{ }_{86}^{x} R n+\alpha\). What is the value of \(X\) in the nuclear reaction above?

A. 220
B. 222
C. 226
D. 227 .

Question 499:

When naphthalene on heating changes from solid state directly to the gaseous state, it undergoes ____________

A. Sublimation
B. Evaporation
C. Combustion
D. Decomposition

Question 500:

Which of the following is an electrolyte?

A. Alcohol
B. Sodium ethanoate
C. Solid potassium hydroxide
D. Mercury