X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. increase the amount of Z produced in a given time

B. increases the rate of change in concentrations of X, Y and Z

C. increases the rate of disapearance of X and Y

D. increases the rate of the forward reaction

E. decreases the amounts of X and Y left after the attainment of equilibrium

What is the formula of sodium gallate if gallium (Ga)shows an oxidation number of + 3?

A. NaGaO₃

B. Na₂Ga(OH)₃

C. NaGa(OH)₃

D. NaGa(OH)₄

E. NaGaO

If the ONLY pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds. carbon monoxide and high levels of methane, the probable source(s) of the pollution must be?

A. automobile exhaust and biological decomposition

B. combustion of coal and automobile exhaust

C. biological decomposition only

D. combustion of coal, automobile exhaust and biological decomposition

E. combustion of coal and biological decomposition

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging?

A. Al and Mg

B. Zn and Fe

C. Zn and Pb

D. Pb and H

E. Au and Hg

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

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

A. Mn²⁺

B. Cl^-

C. H₂O

D. MnO^-₄

E. Cl₂

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

In the reaction H_2(g)O \(\to\) H_2(g) + 1/2O_2(g)

ΔH = -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

Complete hydrogenation of ethyne yields?

A. benzene

B. methane

C. ethane

D. ethene

E. propane

Which of the following is used in the manufacture of bleaching powder?

A. Sulphur dioxide

B. Chlorine

C. Hydrogen tetraoxosulphate (VI)

D. Hydrogen sulphide

E. Nitrogen dioxide