SO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because?
- A. the reaction between SO3 and water is violently exothermic
- B. acid is usually added to water and never water to acid
- C. SO3 does not dissolve in water readily
- D. SO3 is an acid gas
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid?
- A. Sodium trioxocarbonate (IV)
- B. Sodium tetraoxosulphate (IV)
- C. Sodium trioxosulphate (IV)
- D. Sodium sulphide
Clothes should be properly rinsed with water after bleaching because?
- A. the bleach decolourizes the cothes
- B. chlorine reacts with fabrics during bleaching
- C. the clothes are sterilized during bleaching
- D. hydrogen chloride solution is produced during bleaching
Which of these metals CANNOT replace hydrogen from alkaline solutions?
- A. Alulinium
- B. Zinc
- C. Tin
- D. Iron
Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?
- A. N2O and steam
- B. NO2 and ammonia
- C. N2O2 and NO2
- D. NO and NO2
Which of the following is TRUE of Le Chatelier’s Principle for an exothermic reaction?
- A. Increase in temperature will cause an increase in the equilibrium constant
- B. Increase in temperature will cause a decrease in the equilibrium constant
- C. Addition of a catalyst will cause an increase in the equilibrium constant
- D. Addition of a catalyst will cause a decrease in the equilibrium constant
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from?
- A. +7 to +2
- B. +6 to +2
- C. +5 to +2
- D. +4 to +2
An anhydride is an oxide of non-mental
- A. which will not dissolve in water
- B. whose solution in water has a pH greater than 7
- C. whose solution in water has a pH less than 7
- D. whose solution in water has a pH of 7
H– + H2(I)O → H2(g) + OH–(aq). From the equation above, it can be inferred that the?
- A. reaction is a double decomposition
- B. hydride ion is a reducing agent
- C. hydride ion is an oxidizing agent
- D. reaction is neutralization
Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?
- A. made both the anode and the cathode
- B. made the cathode
- C. made the anode
- D. dissolved in the solution
What volume of Oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?
(Molar volume of gas = 22.4 dm\(^3\), 1F = 96,500 C/mol)
- A. 22.4 dm3
- B. 11.2 dm3
- C. 1.12 dm3
- D. 0.560 dm3
20 cm3 of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?
(Na = 23, C = 12, O = 16, H = 1)
- A. 2.50 g
- B. 2.73 g
- C. 3.28 g
- D. 4.54 g
Which of the following compounds is a base?
- A. CO2
- B. CaO
- C. H3PO3
- D. CH3COOCH3
A few drops of concentrated HCI are added to about 10cm3 of a solution of pH 3.4. The pH of the resulting mixtures is?
- A. less than 3.4
- B. greater than 3.4
- C. unaltered
- D. the same as that of pure water
Which of the following atoms represents deuterium?
- A. No protons = 1, No of neutrons = 0, No of electrons = 0
- B. No protons = 1, No of neutrons = 0, No of electrons = 1
- C. No protons = 1, No of neutrons = 1, No of electrons = 1
- D. No protons = 1, No of neutrons = 2, No of electrons = 1
The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolve in 100 g of the resulting mixture is?
(K = 39, O = 16, N =14).
- A. 0.10
- B. 0.20
- C. 1.00
- D. 2.00
Sodium chloride has no solubility product value because of its?
- A. saline nature
- B. high solubility
- C. low solubility
- D. insolubility
A major effect of oil pollution in coastal waters is the?
- A. destruction of marine life
- B. desalination of the water
- C. increase in the acidity of the water
- D. detoxification of the water
A solid that absorbs water from he atmosphere and forms an aqueous solution is?
- A. hydrophilic
- B. efforescent
- C. deliquescent
- D. hygroscopic
Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?
- A. Both are electrovalent
- B. Both are covalent
- C. XZ is electrovalent and YZ3 is covalent
- D. XZ is covalent and YZ3 is electrovalent
Which of the following physical properties decreases down a group in the periodic table?
- A. Atomic radius
- B. Ionic radius
- C. Electropositivity
- D. Electronegativity