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
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
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
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
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
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