Nuclear reactions can be used in the following except
- A. gauging the thickness of objects
- B. making atomic bombs
- C. curing cancer
- D. generating electricity
- E. purifying water
Which of the following is normally used for drying ammonia gas?
- A. Concentrated tetraoxonitrate (Vl) acid
- B. Calcium oxide
- C. anhydrous calcium chloride
- D. phosphorus (V) oxide
- E. anhydrous copper (ll) tetraoxosulphate (VI)
Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?
- A. it is volatile
- B. it is strongly oxidizing
- C. it forms a layer of oxide on the metal
- D. trioxonitrate (V) salts are soluble in water
- E. it renders the metals passive
To what temperature must a gas be raised from 273K in order to double both its volume and pressure?“
- A. 298k
- B. 300k
- C. 546k
- D. 819k
- E. 1092k
Which of the following is not correct of glucose and fructose?They
- A. are structural isomers
- B. reduce fehling's solution
- C. can be obtained by the hydrolysis of starch
- D. are readily fermented by enzymes
- E. are soluble in water
Which of the following statements explains why tetraoxosulphate (IV) acid is reqarded as a strong acid?
- A. Tetraoxosulphate (IV) acid is dibasic
- B. the acid is concentrated
- C. the acid is complately ionized in aqueous solution
- D. tetraxosulphate (IV) ions are very reactive
- E. the acid is highly corrosive
How many mole of AgNO\(_3\) are there in 500cm\(^3\) of 0.01M AgNO\(_3\) solution?
- A. 0.005 mole
- B. 0.05 mole
- C. 0.5 mole
- D. 5 moles
- E. 1 mole
The following alloys contain copper except
- A. magnalium
- B. duralumn
- C. bronze
- D. brass
- E. type metal
Which of the following equations represents the reaction leading to the removal of permanent hardness of water?
- A. Ca(HCO 3)2 → CaCO3 + H2O + CO2
- B. MgSO4 + Na 2CO3 + Na 2SO
- C. Ca(OH) 2 + 2HCI → CaCI 2 + 2H 2O
- D. Ca(HCO3)2 + Ca(OH)3 → 2CaCO3 + 2H2O
- E. MgSO4 + BaCI2 → MgCI2 + BaSO4
In the reaction represented by the equation; 2FeCI3 + SO2 + 2H2O → 2FeCL2 + H2SO4 + 2HCI the oxidation number of sulphur changes from
- A. +2 to + 6
- B. + 4 to + 6
- C. 0 to + 6
- D. - 2 to + 4
- E. +2 to + 4
Which of the following pollutants is biodegradable ?
- A. Sewage
- B. Plastics
- C. Metal scrape
- D. Lead compounds
- E. Hydrogen sulphide
MO and X 2O represent the formula of oxides of elements M and X respectively . If M and X should combine to form a separate compound, what would be the formula of the compound?
- A. MX2
- B. M2X
- C. MX
- D. M3X2
- E. MX3
What is the molecular formula of a compound whose empirical formula is CH2O and molar mass is 180? (H = 1, C = 12, O = 16)
- A. C 4H 8O2
- B. C 4H 8O3
- C. C 6H 10O5
- D. C 6H 12O6
- E. C 12H 22O11
The compound of copper which is used in electroplating dyeing, printing, wood preservation and as a fungicide is
- A. copper (ll) hydroxide
- B. copper (ll) trioxonitrate (V) pentahydrate
- C. copper (ll) tetraoxosulphate (VI) pentahydrate
- D. copper (ll) oxide
- E. copper (ll) trioxocarbonate (lV)
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