NH3(g) + HCl(g) → NH4Cl(s) The entropy change in the system above is

• A. negative
• B. indeterminate
• C. positive
• D. zero

Choose the option opposite in meaning to the word(s) or phrase underlined

The girl was rewarded for herrectitude

• (A)moral goodness
• (B)snobbishness
• (C)dishonesty
• (D)disobedience

In His teachings as the True Vine, Jesus maintained that prayers could be answered if the disciples

• A. confess their sins
• B. abide in him
• C. pray constantly
• D. ask for edifying things

The most urbanized part of Nigeria is the?

• A. south-east
• B. Middle-belt
• C. north-east
• D. south-west

Express 25° 45' in decimal (Hint: 1° = 60')

• A. 25.75^o
• B. 25.55^o
• C. 25.45^o
• D. 25.15^o

(a) What is the change in oxidation state of chromium in the reaction represented by the following equation?

3SO\(_2\) + Cr\(_2\)O\(^2_{-7}\) + 2H\(^+\) -> 3SO\(_4^{2-}\) + 2Cr\(^{3+}\) + H\(_2\)O

(b) Use the half equations given below to deduce the equation for the reaction between iron(II) ions and heptaoxodichromate (VI) ions in acidic solution.

Fe\(^{2+}\) --> Fe\(^{3+}\) + e\(^-\)

Cr\(_2\)O\(^{2-}_7\) + 14H\(^+\) + 6e\(^-\) ----> 2Cr\(^{3+}\) + 7H\(_2\)O.

What factors led to the increasing popularity of the presidential system of government in West Africa?

Monosaccharides are

• A) hydrolysable
• B) non-hydrolysable
• C) not soluble in water
• D) sweet but sometimes non sugary

I. All elements emit and absorb characteristic spectra. II. Spectral analysis is an important method of identifying environmental pollutants. III. The chemical composition of stars could be determined using spectral analysis. Which of the statements above are correct?

• A. I, II and III
• B. II and III only
• C. I and III only
• D. I and II only

Consumers require protection against exploitation to ensure?

• A. adequate consumer awareness
• B. availability of products variety
• C. the sale of quality products
• D. increased aggregate demand