Determine the volume of 0.100 mol of HCl in \(0.250 mol dm^3\) of solution.
- A. \(200cm^3\)
- B. \(100cm^3\)
- C. \(20cm^3\)
- D. \(400cm^3\)
Which of the statements about gases is not correct?
- A. Gases have low densities compared to solids and liquids of equal mass.
- B. The total kinetic energy of the gas is not affected by collision
- C. Molecules of the gas are in constant motion
- D. Gases are highly soluble in water at high temperatures
A compound that could be dried by using conc. tetraoxosulphate (VI) acid and not by calcium oxide is likely to be
- A. a deliquescent salt
- B. a neutral salt
- C. an alkaline gas
- D. an acid anhydride
If \(100^3\) of a saturated solution of sodium tetraoxosulphate (VI) at 30° C contains 10.5 g of the salt, what would be its solubility at this temperature? [(\(Na_2SO_4\) = 142]
- A. 2.15 mol dm-3
- B. 0.74 mol dm-3
- C. 0.60 mol dm-3
- D. 0.57 mol dm-3
The periodic property that is used to determine whether a covalent molecule is polar or not is
- A. atomic radius
- B. ionization energy
- C. electron affinity
- D. electronegativity
The gas that is less dense than air is
- A. nitrogen
- B. chlorine
- C. Carbon(IV) oxide
- D. Oxygen
The primary component of natural gas
- A. ethane
- B. methane
- C. butane
- D. propane
Going down group II in the periodic table normally
- A. ionization energy increases
- B. melting point increases
- C. shielding effect decreases
- D. electronegativity increases
A consequence of global warming is
- A. air pollution
- B. High Humidity
- C. flooding
- D. Water pollution
How many unpaired electrons are present in \(_{26}Fe^{3+}\)?
- A. 4
- B. 2
- C. 3
- D. 5
Which of the following laws or theory cannot be explained by the application of the kinetic theory of gases?
- A. Dalton's atomic theory
- B. Charle's law
- C. Boyle's law
- D. Gay- Lussac's law
Carbon is deposited in the exhaust pipes of cars because of
- A. presence of additives in petrol
- B. incomplete combustion of petrol
- C. presence of carbon in petrol
- D. contamination of petrol with diesel
What takes place at the cathode during electrolysis?
- A. Anions lose electrons
- B. Anions are oxidized
- C. Cations are oxidized
- D. Cations are discharged.
Copper (II) ions are able to participate in co-ordinate covalent bonding because they
- A. are coloured
- B. are positively charged
- C. have vacant d-orbital
- D. have unpaired electrons
Arrange the following compounds in decreasing order of their boiling points: \(NH_3\), HF, \(SiH_4\), \(CH_4\)
- A. HF,\(NH_3\), \(SiH_4\), \(CH_4\)
- B. \(CH_4\), \(SiH_4\), HF, \(NH_3\),
- C. \(NH_3\),\(CH_4\), \(SiH_4\), HF
- D. \(CH_4\), \(SiH_4\), \(NH_3\), HF
Consider the following reaction equation:
\(2SO_3(g) → 2SO_2(g) + O_2\)(g)
∆H = +198 kJ/mol
Which of the following statements about the reaction is correct?
- A. 198 kJ of energy is given off
- B. The reaction is exothermic
- C. The reaction container would feel warm.
- D. 198 kJ of energy is absorbed
The separation technique that is suitable for separating iodine from tetrachloromethane is
- A. solvent extraction
- B. decantation
- C. fractional distillation
- D. filtration
The salt solution formed firm a reaction between ethanoic acid and sodium hydroxide solution would be
- A. amphoteric.
- B. neutral
- C. basic
- D. acidic
Which of the following equations does not illustrate correctly one of the reactions of chlorine?
- A. \(Ca(OH)_2 + Cl_2 → CaOCl_2 + H_2O\)
- B. \(Cl_2 + 2NaF → 2NaCl + F_2\)
- C. \(Cl_2 + 2NaOH → NaCl + NaClO + H_2O\)
- D. \(H_2S + Cl_2 → 2HCl + S\)
The pair of compounds that belongs to the same homologous series is
- A. \(C_2H_6\) and \(C_4H_{10}\)
- B. \(C_3H_8\) and \(C_3H_6\)
- C. \(C_2H_4\) and \(C_4H_{10}\)
- D. \(C_4H_{10}\) and \(C_5H_{10}\)
Which of the following equimolar solutions has the highest conductivity?
- A. \(H_2SO{_4(aq)}\)
- B. \(NaOH{_(aq)}\)
- C. \(H_2CO{_3(aq)}\)
- D. \(CH_3COOH{_4(aq)}\)