Waec Chemistry 2009 Past Questions and Answers

Question 21:

• WAEC 2009

What is the value of -14^oC on the Kelvin temperature scale?

A. 259K
B. 287 K
C. 287^oK
D. 259^oK

Question 22:

• WAEC 2009

Which of the following expressions correctly represents Charles' law?

A. PV = K
B. R \(\alpha \frac{1}{\sqrt{p}\)
C. PV = RT
D. V = KT

Question 23:

• WAEC 2009

In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called

A. Atmospheric pressure
B. Partial pressure
C. Total pressure
D. Vapour pressure

Question 24:

• WAEC 2009

In a chemical reaction, ∆H is positive when

A. H _(product) >H _(reactant)
B. H_(product) < H _(reactant)
C. H _(product) = H _(reactant)
D. H _(product) = Zero _(reactant)

Question 25:

• WAEC 2009

Consider the reaction represented by the following equation: H _2(g) + \(\frac{1}{2}\) O_(g) → H ₂O_(g) ∆H =-285.8 KJmo ^-1 ∆H represents the enthalpy of

A. Formation
B. Hydration
C. Neutralization
D. Solution