When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is

• A. Y₂O
• B. YNO₂
• C. Y₂O₃
• D. Y (NO₂)₂

Part payments made on allotted shares by subscribers is usually the

• A. subscribed capital
• B. authorized capital
• C. issued capital
• D. called-up capital

Using a scale of 2cm to 1 unit on the x- axis and 1cm to 1 unit on the y- axis, draw on the same axes the graphs of \(y = 3 + 2x - x^{2}; y = 2x - 3\) for \(-3 \leq x \leq 4\). Using your graph:

(i) solve the equation \(6 - x^{2} = 0\);

(ii) find the maximum value of \(3 + 2x - x^{2}\);

(iii) find the range of x for which \(3 + 2x - x^{2} \leq 1\), expressing all your answers correct to one decimal place.

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences. The ............ were decorated with flowers.

• A. girls shoes
• B. girls shoes'
• C. girls' shoes
• D. girls' shoes'

The Nigerian Military Government launched the Second National Development Plan in 1970 purposely

• A. to develop all the disadvantaged states
• B. to accelerate the development of the country
• C. for rapid economic and social development of the cuntry after the civil war
• D. to further the cause of a united, strong and self reliant nation

Sin 60° has the same value as

I. Sin 120°

II. cos 240°

III. -sin 150°

IV. cos 210°

V. sin 240°

• A. I only
• B. II only
• C. IV only
• D. III only

Seasons are recognized with in the tropics primarily on the basis of?

• A. air masses
• B. temperature
• C. rainfall
• D. evaporation

1989 Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 23mol^-1)

• A. 1/2 x 6.02 x10²³
• B. 1 x 6.02 x10²³
• C. 2 x 6.02 x 10 23²³
• D. 3x 6.02 x 10 23²³

Simplify; \(\frac{a}{b} - \frac{a}{a} - \frac{c}{b}\)

• A. \(\frac{a - b + c}{ab}\)
• B. \(\frac{ab - bc - ac}{ab}\)
• C. \(\frac{a^2 - b^2 + ac}{ab}\)
• D. \(\frac{a^2 - b^2 - ac}{ab}\)

Which of the following indices is a measure of development?

• A. Total population
• B. Population density
• C. Life density
• D. Types of building