Jamb Chemistry Past Questions and Answers

Question 1991:

• JAMB 2018

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 \(^{23}\)mol]

A. 1.20 x 10\(^{22}\)
B. 2.4 x 10\(^{22}\)
C. 1.51 x 10\(^{22}\)
D. 3.02 x 10\(^{22}\)

Question 1992:

• JAMB 2018

The radio isotope used in industrial radiography for the rapid checking of faults in welds and casting is?

A. Carbon-14
B. Phosphorus-32
C. Cobalt
D. Iodine-131

Question 1993:

• JAMB 2018

Beryllium and Aluminium have similar properties because they

A. Are both metals
B. Belong to the same group
C. Belong to the same period
D. Are positioned diagonally to each other

Question 1994:

• JAMB 2018

mE + nF -----> pG + qH
In the equation shown, the equilibrium constant is given by?

A. \(\frac{[E]^m[F]}{[G]^p[H]^q}\)
B. \(\frac{[E][F]}{[G][H]}\)
C. \(\frac{[G]^p[H]^p}{[E]^m[F]^n}\)
D. \(\frac{[G][H]}{[E][F]}\)

Question 1995:

• JAMB 2018

(I). 3CuO(s) + 2NH3(g) -----> 3Cu(s) + 3H2O(l) + N2(g)
(II). 2NH3(g) + 3Cl2(g) -----> 6HCl(g) + N2(g)
(III). 4NH3(g) + 3O2(g) -----> 6H2O(l) + N2(g)
The reactions represented by the equations above demonstrate the

A. Basic properties of ammonia
B. Acidic properties of ammonia
C. Reducing properties of ammonia
D. Oxidizing properties of ammonia