Which of the following gases will have the highest rate of diffusion under the same conditions? (H = 1, C =12, O = 16, S = 32, CI = 35.5)
- A. O2
- B. CI2
- C. HCI
- D. H2S
- E. CO2
When sucrose is warmed with Fehling’s solution
- A. a silver mirror is produced
- B. the solution turns milky
- C. a brick-red precipitate is formed
- D. there is no precipitate
- E. a blue coloration is produced
The following salts are readily soluble in water except
- A. Na2CO3
- B. Pb(NO3)2
- C. KCI
- D. CuCO3
- E. PbSO4
Which of the following involves the decomposition enzymic action?
- A. Esterification
- B. Fermentation
- C. Dehydration
- D. Polymerization
- E. Saponification
Consider the compounds represented by the following general formula: X2SO4 Y2(SO4)3, 24H2OX and Y could respectively be
- A. K and AI
- B. Fe and K
- C. AI and Fe
- D. AI and K
- E. Cr and K
When iron rusts, it undergoes
- A. deliquescence
- B. chemical decomposition
- C. hydrolysis
- D. redox reaction
- E. combustion
What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P (s) + 5O(2)(g) → 2P2O5(g)
- A. 0 to + 2
- B. 0 to 5
- C. +4 to + 2
- D. +4 to +5
- E. +4 to +7
What is the following compounds will not decompose when heated strongly ?
- A. NaHCO3
- B. K2CO3
- C. MgCO3
- D. Ca(HCO3)2
- E. ZnCO3
”The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants”. This statement is associated with the
- A. Kinetic theory
- B. rate law
- C. atomic theory
- D. collision theory
- E. gas laws
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)
- A. 0. 11F
- B. 0.12F
- C. 0.22F
- D. 1.1F
- E. 2.2F
The scum formed when soap is mixed with hard water could be
- A. calcium trioxocarbonate (IV)
- B. propane- 1, 2, 3 - triol
- C. calcium hydrogentrioxocarbonate (IV)
- D. magnesium tetraoxosulphate (IV)
- E. calcium stearate
The halide used widely in photography is
- A. ammonium chloride
- B. calcum chloride
- C. silver bromide
- D. sodium brmide
- E. aluminium fluroide
When air is passed through potash and then pyrogallol, the components are noble gases,
- A. oxygen and carbon (IV) oxide
- B. oxygen and nitrogen
- C. nitrogen and water vapour
- D. water vapour and carbon (IV) oxide
- E. oxygen and water vapour
The reactions ethyne are mainly
- A. substitution reactions
- B. addition reactions
- C. addition polymerization
- D. catalytic hydrogenation
- E. catalytic halogenation
The following acids are monobasic except
- A. methanoic acid
- B. dioxonitrate lll acid
- C. ethanedioic acid
- D. oxochlorate (l) acid
- E. hydrobromic acid
If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10\(^3\) Nm\(^{-2}\) is 2.12dm\(^3\), what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10\(^3\) Nm\(^{-2}\), Standard temperature = 273K)
- A. 39.3dm 3
- B. 22.4dm3
- C. 4.93dm3
- D. 3.93dm3
- E. 0.393dm3
Which of the following processes is a physical reaction?
- A. Electrolysis
- B. Hydrolysis
- C. Allotropic change
- D. Neutralization
- E. Corrosion
Study carefully the reaction represented by the equation below. 2H2O 2(l) → O 2(g) + 2H2O(l). Which of the following will not reaction increase the reaction rate?
- A. Heating the hydrogen peroxide
- B. Adding a pinch of MnO2 to the reactant
- C. increasing the concentration of the H2O2
- D. Adding water to the reactant
- E. Exposing the reactant to sunlight
Methanol is obtained from wood by
- A. esterification
- B. bacterial decomposition
- C. combustion
- D. fractional distillation
- E. destructive distillation
The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is
- A. 3
- B. 9
- C. 10
- D. 18
- E. 32
When steam is passed over white-hot coke, the products are
- A. carbon (IV) oxide and nitrogen
- B. carbon (II) oxide and hydrogen
- C. carbon (ll) oxide and nitrogen
- D. carbon (lV) oxide and steam