Chemistry Past Questions and Answers

A certain industrial process is represented by the chemical equation 2A_(g) + B_(g) \(\to\) C_(g) + 3D_(g) \(\Delta\)H = X kJmol^-1. Which of the following conditions will favour the yield of the products?

A Increase in temperature, decrease in pressure
B Increase in temperature, increase in pressure
C Decrease in temperature,increase in pressure
D Decrease in temperature, decrease in pressure
E Constant in temperature, increase in pressure

Question 7:

2MnO^-₄ + 10Cl^- + 16H⁺ â†’ 2Mn²⁺ + 5Cl₂ + 8H₂O. Which of the substances serves as an oxidizing agent?

A Mn²⁺
B Cl^-
C H₂O
D MnO^-₄
E Cl₂

Question 8:

Which of the following metals will displace iron from a solution of iron(ll)tetraoxosulphate(lV)?

A Copper
B Mercury
C Silver
D Zinc
E Gold

Question 9:

In the reaction H_2(g)O \(\to\) H_2(g) + 1/2O_2(g)
Î”H = -2436000 KJ, which of the following has no effect on the equilibrium position?

A Adding argon to the system
B Lowering the temperature
C Adding hydrogen to the system
D Decreasing the pressure
E Increasing the temperature

Question 10:

Complete hydrogenation of ethyne yields?

A Benzene
B Methane
C Ethane
D Ethene
E Propane