Chemical combination - Jamb Chemistry Past Questions and Answers

Question 126:

• JAMB 2012

2H_2(g) + O_2(g) → 2H₂ O_(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube?

A. 200 cm³
B. 400 cm³
C. 600 cm³
D. 700 cm³

Question 127:

• JAMB 2012

Which of the following is used to study the arrangement of particles in crystal lattices?

A. Alpha-particles
B. Beta-particles
C. Gamma-rays
D. X-rays

Question 128:

• JAMB 2014

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

A. 128
B. 8
C. 16
D. 64

Question 129:

• JAMB 2014

200 cm³ of a gas at 25^oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm³ at 75^oC.

A. 342.53 mmHg
B. 1430.54 mmHg
C. 467.11 mmHg
D. 400.00 mmHg

Question 130:

• JAMB 2014

A silicon -containing ore has 92% ²⁸Si, 5% ²⁹Si and 3% ³⁰Si. Calculate the relative atomic mass of the silicon.

A. 14.00
B. 29.00
C. 28.11
D. 28.00