Which of the following salts in aqueous solution will have a pH greater than 7?
- A. NaCl
- B. ACI3
- C. FeCI3
- D. Na 2SO4
- E. K 2CO3
The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI)acid is
- A. H2S
- B. \(SO_{2}\)
- C. HCI
- D. SO3
- E. O2
Which of the following correctly explains entropy?
- A. the natural tendency for a system to achieve a greater disorder
- B. a balance of two driving forces between free energy and enthalpy changes
- C. the cause of spontaneity of a reaction
- D. a measure of the enthalpy of a reaction
- E. a measure of the rate of attaining equilibrum in a reversible reaction
How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x \(10^{23 }\)mol-1)
- A. 1.2 x 10 23
- B. 3.0 x 1023
- C. 6.0 x1023
- D. 1.2 x 1024
- E. 30 x1023
A catayst which increases the rate of a chemical reaction does so by
- A. increasing the reaction pathway
- B. increasing the surface area of the reactants
- C. increasing the pressure on the system
- D. decreasing the temperature at which the reaction occurs
- E. decreasing the activation energy of the reaction
Which of the following reactions does not occur in the blast furnace during the extraction of iron?
- A. Fe2O3 (s) + 3CO(g) → 2Fe(l) + 3CO2(g)
- B. C2 + CO 2(g)
- C. CaO(s) + SiO2(s) → CaSiO 3(s)
- D. FeO(s) + CO2(g) + Fe(l)
- E. 2Fe2O(s) → 4Fe(l) 3O2(g)
Which of the following compounds will undergo additional reactions?
- A. Ethyne
- B. Butane
- C. Pentane
- D. Tetrachloromethane
- E. Ethanol
When a solid melts and consequently boils, there is
- A. a gradual increase in the average kinetic energy of the particles
- B. a sudden decrease in the kinetic energy of the particles
- C. no change in the average kinetic energy of the particles
- D. a rapid change in the nature of bonding of the components
- E. a change in the size of the fundamental particles
Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium
- A. has a lower density than iron
- B. is a better conductor than iron
- C. does not corrode spontaneously
- D. forms thin layer of inert oxide in moist air
- E. forms amphoteric oxides while iron does not
The heat accompanying the reaction represented by the equation H2O (l) → H 2O(g) is described as the heat of
- A. solution
- B. neutralization
- C. vaporization
- D. sublimation
- E. activation
The electronic configuration 1s2 22s 22p 63s23p 6 is that of a
- A. noble gas
- B. Group ll element
- C. Group lll element
- D. Group V element
- E. Group VI element
A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?
- A. Decantation
- B. Chromatography
- C. Distillation
- D. Filtration
- E. Evaporation
Which of the following reaction will not take place under normal conditions?
- A. Zn(s) + 2HCl → ZnCI2(aq) + H 2(g)
- B. Fe (s) + H 2SO4(aq) → FeSO4(aq) + H2(g)
- C. Cu (s) + 2HCI (aq) → CuCI 2(aq) + H2(g)
- D. Ca(s) + 2H 2O (1) → Ca(OH)2(g) + H2(g)
- E. 2Na(s) + 2H 2O (1) → 2NaOH(aq) + H2(g)
Catalytic hydrogenation of oils results in the production of
- A. soaps
- B. detergents
- C. alkanes
- D. butter
- E. margarine
What is the voltage of the cell represented at Zn(s) Zn 2+(aq) /Cu2+(aq) /Cu(s) given that for Cu 2+(aq)/ Cu (s) Eo = 0.337V and for Zn2+(aq) /Zn(s)’ E o = -0.763V?
- A. +0.426V
- B. -0.426V
- C. -0.337V
- D. -1.10V
- E. +1.10V
The oxidation number of chlorine is + 1 in
- A. KCIO 3
- B. CI 2O 7
- C. ZnCI2
- D. HCI
- E. NaCIO
50cm 3 of a saturated solution of potassium trioxonitrate (V)at 40°C contains 5.05g of the salt. What is the solubility of potassium trioxonitrate (V) at 40°C? (KNO3 = 101)
- A. 1.0 mol dm-3
- B. 1.5 mol dm-3
- C. 2.0 mol dm-3
- D. 2.5mol dm-3
- E. 5.0mol dm-3
Which of the following is a condition for a spontaneous reaction?
- A. ∆H -T is zero
- B. ∆H-T∆ S is positive
- C. ∆H-T∆ S is negative
- D. ∆S is zero
- E. ∆S is positive
The electronic configuration of two atoms X and Y are as follows: X – 1s 2 2s 22p 63s 1, Y -1s 22s 22p 63s23p 64s 2 which of the statements below is true of the position of X and Y in the Periodic Table?
- A. x belongs to group 1, Y belongs to period 2,
- B. x belongs to group 1, Y belongs to period 4
- C. x belongs to group 2, Y belongs to period 1
- D. x belongs to group 3, Y belongs to period 2
- E. x belongs to group 3, Y belongs to period 4
What quantity of copper will be deposited by the same quantity of electricity that deposited 9.0g of aluminum? (A = 27, Cu = 64)
- A. 64g
- B. 32g
- C. 7.1g
- D. 6.4g
- E. 3.2g
Which of the following statements is not true of tin? it
- A. is a p-block element
- B. is extracted from cassiterite SnO 2
- C. is used for protecting iron containers from corrosion
- D. combines with copper to form the alloy brass
- E. shows two oxidation states, + 2 and + 4 in most of its compounds