Jamb Chemistry 1982 Past Questions and Answers

Question 46:

• JAMB 1982

The number of grammes of potassium hydroxide in 250cm³ of one molar solution is?
(K = 39, O = 16, H = 1)

A. 40g
B. 52g
C. 100g
D. 26g
E. 14g

Question 47:

• JAMB 1982

60cm³ of hydrogen are sparked with 20cm³ of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?

A. 60 cm³
B. 10 cm³
C. 40 cm³
D. 30 cm³
E. 70 cm³

Question 48:

• JAMB 1982

The solubility curve of a solid X (molecular mass = 160) is as show above. 1,000 cm3 of a saturated solution of X at 80°C is cooled to 40°C . The weight of X crystalized out would be

A. 10 g
B. 12 g
C. 14 g
D. 16 g
E. 18 g

Question 49:

• JAMB 1982

The i.u.p.A.C name for the compound

A. 2-chloro-isopentane
B. 3-chloro-isopentane
C. 2-chloro-2-methylbutane
D. 1-chloro-2,2- dimethylpropane
E. 2-chloro-2-ethylpropane