Which of the following is suitable for determining different isotopes present in an element which exhibits isotopy?
- A. Sensitive weighing balance
- B. Cathoda ray tube
- C. Mass spectrometer
- D. Geiger muller counter
- E. Eudiometer
Hydrogen is used for the following except
- A. manufacturing of ammonia
- B. synthesis of hydrochloric acid
- C. extinguishing fire
- D. conversion of coal to petrol
- E. manufacture of margarine
In solution, aminoethanoic acid (glycine) can be represented as NH+3 CH2COO. This implies that it
- A. is soluble in all inorganic liquids
- B. can function as a weak acid or a weak base
- C. does not form salt with mineral acids
- D. is highly acidic
- E. cannot form esters with alkanols
river contaminated by alkali waste will have a pH of about.
- A. 1
- B. 3
- C. 5
- D. 7
- E. 9
An organic compound which reacts readily with bromine to form a compound with the formula CH3CHBrCH2Br is
- A. ethene
- B. propane
- C. butane
- D. propene
- E. propyne
When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was
- A. concentrated
- B. supersaturated
- C. unsaturated
- D. colloidal
- E. saturated
A current of 4.0 amperes was passed through copper (ll) tetraoxosulphate (IV) solution for one hour using copper electrodes. What was the mass of copper deposited? (Cu = 64, 1F = 96500 C)
- A. 3.2g
- B. 4.8g
- C. 6.4g
- D. 48g
- E. 96g
In which of the following crystals are the particles held by van der Waal’s forces only?
- A. Sodium chloride
- B. Ice
- C. Diamond
- D. Iodine
- E. Quartz
Compounds that have the same molecular formula but different structures are said to be
- A. allotropic
- B. polymorphic
- C. polymeric
- D. isomeric
- E. isotopic
Which of the following properties is not characteristic of electrovalent compounds?
- A. formation of crystalline solids
- B. solubility in polar solvents
- C. high vapour pressures
- D. high melting and boiling points
- E. ability to conduct electricity in aqueous solution
How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1
- A. 1
- B. 2
- C. 3
- D. 4
- E. 11
Which of the following is not a direct petroleum product?
- A. Methane
- B. Ethanol
- C. Petrol
- D. Vaseline
- E. Kerosene
Which of the reactions represented by the following equations will take place at room temperature?
- A. C 6 H2O → CO + H2
- B. CuO + H2 → Cu + H2O
- C. N2 + 3H2 → 2NH3
- D. 2Na + 2H2O → 2NaOH + H2
- E. 2Fe + 3CI2 → 2FeCI3
When starch undergoes complete enzyme-catalyzed hydrolysis, the resulting product is
- A. glucose
- B. maltose
- C. sucrose
- D. fructose
- E. cellulose
In the redox reaction represented by the following equation: Cu2+aq + Zn(s) → Cu(s) + Zn2+
- A. the oxidation number of copper increases
- B. copper (ll) ions are reduced to copper atoms
- C. zinc atoms are reduced to zinc ions
- D. copper (ll) ions donate electrons to zinc atoms
The ratio of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N2,/SUB> (g) → 2NH3(g) which of the following law is demonstrated by this?
- A. Boyle's law
- B. Law of multiple proportion
- C. Gay Lussac's law
- D. Law of constant composition
- E. Avogadro's law
Esterification of propane 1,2,3-triol and unsaturated higher carboxylic acids will produce
- A. fats
- B. soap
- C. methly-propanoate
- D. alkanols
- E. oils
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3)
- A. 1.12dm3
- B. 2.24dm3
- C. 4.48dm3
- D. 11.2dm3
- E. 22.4dm3
Consider the reaction represented by the equation below: H2(g) + 12(s) ⇌ 2HI(g) ∆H negative. Which of the following takes place when the temperature of the reaction vessel is decreased?
- A. the gases condense
- B. the yield of hydrogen increases
- C. the concentration of the reactants remain constant
- D. more of the hydrogen iodide decomposes
- E. the yield of hydrogen iodide increases
CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ∆H = 890KJ mo-1 ∆H in the reaction represented by the equation above is the enthalpy of
- A. formation
- B. combustion
- C. solution
- D. activation
- E. neutralization
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula
- A. C2H5OH
- B. C 3H 4
- C. HCOOH
- D. H2O2
- E. C6H6