Question 491:

• JAMB 1986

How much of magnesium is required to react with 260cm³ of 0.5 M HCl? [Mg = 24]

A. 0.3g
B. 1.5g
C. 2.4g
D. 3.0g

Question 492:

• JAMB 1986

The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation

A. U = (kM)\(\frac{1}{2}\)
B. U = (kM)²
C. U = \(\sqrt{\frac{k}{m}}\)
D. U = \(\frac{k}{m}\)

Question 493:

• JAMB 1986

An element with atomic number twelve is likely to be

A. Electrovalent with a velocity of 1
B. Electrovalent with a valency of 2
C. Covalent with a valency of 2
D. Covalent with valency of 4

Question 494:

• JAMB 1986

Which of the following groups of physical properties increases from left to right of the periodic table?
i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electron affinity

A. I and ii
B. I, ii and iii
C. Iii and iv
D. I, ii, iii and iv

Question 495:

• JAMB 1987

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO_2(g) + O_2(g) ↔ 2SO_3(g), ∆H = -196 kJ. What factor would influence increased production of SO_3(g)?

A. Addition of a suitable catalyst
B. Increase in the temperature of the reaction
C. Decrease in the temperature of the reaction
D. Decrease in the concentration of SO_2(g)