Post Utme Chemistry Past Questions and Answers

Question 1091:

The equilibrium constant at constant pressure, \(K _{ p }\) for the reaction,
\(2 NO _{( g )}+ Cl _{2( g )} \leftrightarrow 2 NOCl _{( g )}\)
is 800 . The partial pressures of the gas mixture at equilibrium are \(0.02 atm\) each for \(NO\) and \(Cl _{2}\). What is the partial pressure of \(NOCl\) in the mixture?

A. \(0.02 atm\)
B. \(6.41 \times 10\) \({ }^{4} atm\)
C. \(0.04 atm\)
D. \(0.08 atm\)

Question 1092:

How many sigma \((\partial)\) bonds are there in the molecule below ____________

A. 4
B. 5
C. 8
D. 10

Question 1093:

Burning of \(0.46 g\) of ethanol produced heat that raised the temperature of \(100 g\) of water by \(30^{\circ} C\). Calculate the heat of combustion of ethanol, \(C _{2} H _{5} OH .( C =12 ; H =1 ; 0=\) 16)

A. \(50 kJmol ^{-1}\)
B. \(900 kJmol ^{-1}\)
C. \(1200 kJmol ^{-1}\)
D. 1000 \(kJmol ^{-1}\)

Question 1094:

When chlorine is bubbled into potassium iodine solution ____________

A. A white precipitate is seen
B. Reddish brown colour develops
C. Solution remains colourless
D. Blue colour is seen

Question 1095:

\(PCl _{( g )} \rightleftharpoons PCl _{3( g )}+ Cl _{2( g )}\).
In the reaction above, an increase in pressure will ____________

A. Do celerate the reaction
B. Increase the yield of \(PCl _{3}\)
C. In crease the yield of \(PCl _{5} \)
D. Accelerate the reaction