The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their
- A. physical states
- B. melting points
- C. Rf. values
- D. solubility
- E. boiling points
In which of the following is the oxidation number of nitrogen zero?
- A. SO2 and NH3
- B. NaNO3
- C. HNO2
- D. NOI3
- E. N2
The metal extracted from cassiterite is
- A. calcium
- B. copper
- C. tin
- D. sodium
- E. lead
Petrol can be obtained from diesel by
- A. distillation
- B. cracking
- C. catalysis
- D. polymerization
- E. dehydrogenation
The following metals are extracted by the electrolytic method except
- A. potassium
- B. calcium
- C. sodium
- D. tin
- E. magnesium
Which of the following compounds crystallizes without water of crystallization?
- A. Na2CO3
- B. CuSO4
- C. MgSO4
- D. NaCI
- E. FeSO4
The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm3 of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm3)
- A. 18 g
- B. 34 g
- C. 36 g
- D. 64 g
- E. 68 g
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)