2H2(g) + O2(g) → 2H2 O(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm3 of oxygen and 1000 cm3 of hydrogen are exploded in a sealed tube?
- A. 200 cm3
- B. 400 cm3
- C. 600 cm3
- D. 700 cm3
An increase in the pressure exerted on gas at a constant temperature results in
- A. a decrease in the number of effective collisions
- B. a decrease in volume
- C. an increase in the average intermolecular distance
- D. an increase in volume
50 cm\(_3\) of gas was collected over water at 10ºC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10ºC is 5mm Hg
- A. 49.19 cm 3
- B. 48.87 cm 3
- C. 48.55 cm 3
- D. 48.23 cm 3
How many atoms are present in 6.0g of magnesium?
[Mg = 24, NA = 6.02 x 1023 mol-1]
- A. 1.20 x 1022
- B. 2.41 x 1022
- C. 1.51 x 1023
- D. 3.02 x 1023
Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
- A. netralization with NaOHfoolowed by filtration
- B. neutralization with NaOH followed by distillation
- C. fractional distillation
- D. filtration followed by distillation
An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula
rn(C=12,H =1, O=16)
- A. C 5H 12O
- B. C 3H 8O
- C. C 6H 13O 2
- D. C 4H 9O
Which of the following fraction is used as raw material for the cracking process?
- A. kerosine
- B. lubricating oil
- C. bitumen
- D. diesel oils
A primary amide is generally represented by the formula
- A. RCOOR
- B. RCONH 2
- C. RCONHR
- D. RCONR 2
The decarboxylation of ethanoic acid will produce carbon (IV)oxide and
- A. methane
- B. ethane
- C. propane
- D. butane
The reaction between ammonia and ethyl ethanoate produces
- A. propanol and ethanamide
- B. propanol and propanamide
- C. ethanol and propanamide
- D. ethanol and ethanamide
2- methylpropan-2-ol is an example of a
- A. dihydric alkanol
- B. tertiary alkanol
- C. secondary alkanol
- D. primary alkanol
Aluminium containers are frequently used to transport trioxonitrate (V) acid because aluminium
- A. has a silvery-white appearance
- B. has a low density
- C. does not react with the acid
- D. does not corrode
The coloured nature of transition metal ions are associated with their partially filled
- A. f- orbital
- B. s- orbital
- C. p-orbital
- D. d-orbital
Copper is displaced from the solution of its salts by most metals because it
- A. is a transition element
- B. is at the bottom of the activity series
- C. is very reactive
- D. has completely filled 3d-orbitals
A metal that forms soluble trioxosulphate (IV) ion is
- A. barium
- B. potassium
- C. manganese
- D. aluminium
Sulphur (IV)oxide is a strong reducing agent in the presence of water due to the formation of
- A. hydroxide ion
- B. sulpgur (Vl)oxide
- C. hydrogen sulhide
- D. trioxosulphate (IV) salt
Which of the gases is employed as an anaesthesia?
- A. N 2O
- B. NO2
- C. NH3
- D. NO
In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to
- A. prevent condensed water from breaking the reaction flask
- B. enable the proper mixing of the reactions in the flask
- C. enhance the speed of the reaction
- D. prevent formation of precipitate
Which of the following compounds is a neutral oxide?
- A. Carbon (IV) oxide
- B. Sulphur (Vl) oixide
- C. Sulphur (IV) oxide
- D. Carbon (ll) oxide
the minimum amount of energy required for a reaction to take place is
- A. lattice energy
- B. ionization energy
- C. activation energy
- D. kinetic energy
In an endothermic reaction, if there is a loss in entropy the reaction will
- A. be indeterminate
- B. be spontaneous
- C. not be spontaneous
- D. be at equilibrium