Jamb Chemistry Past Questions and Answers

Question 356:

• JAMB 1984

Sodium chloride may be obtained from brine by

A. Titration
B. Decantation
C. Distillation
D. Evaporation
E. Sublimation

Question 357:

• JAMB 1984

20 cm ³ of hydrogen gas are sparked with 20cm ³ of oxygen gas in an endimoeter at 373k (100 ^oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 ^oC) and passed over calcium chloride. The volume of the residual gas is

A. 40 cm ³
B. 20 cm ³
C. 30 cm ³
D. 10cm ³
E. 5cm ³

Question 358:

• JAMB 1984

For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)

A. 2.24 dm ³
B. 2.24 cm³
C. 1. 12³
D. 1. 12dm ³
E. 4. 48 dm ³

Question 359:

• JAMB 1984

A molar solution of caustic soda is prepared by dissolving

A. 40 g NaOH in 100 g of water
B. 40 g NaOH in 1000 g of water
C. 20 g NaOH in 500 of solution
D. 20 g NaOH in 1000 g of solution
E. 2o g NaOH in 80 g of solution

Question 360:

• JAMB 1984

Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?

A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1, 2, and 3
E. 2, 3, and 5