What is the volume of oxygen required to burn complete 45 cm\(^3\) of methane at s.t.p?
- A. 135.0 cm3
- B. 180.0 cm3
- C. 45.0 cm3
- D. 90.0 cm3
Which experiment led to the measurement of the charge on an electron?
- A. Mass spectrometric experiment
- B. Oil-drop experiment
- C. Scattering ฮฑ - particles
- D. Discharge-tube experiment
Calculate the mass of chlorine gas which occupies a volume of 1.12dm3 at s.t.p
[Cl = 35.5, molar volume of gas at s.t.p = 22.4 dm3
- A. 15.50 g
- B. 7.10 g
- C. 3.55 g
- D. 1.80 g
MnO\(_2\)(s) + xHCl(aq) โ MnCl\(_2\)(aq) + yH\(_2\)O(l) + zCl\(_2\)(g)
In the equation above, what are the values of x, y and z respectively
- A. 2, 1, 2
- B. 4, 1, 2
- C. 4, 2, 1
- D. 1, 2, 1
The oxidation state of oxygen in tetraoxosulphate (VI) acid is
- A. -4
- B. -2
- C. +4
- D. -8
Calculate the number of moles of HCl present in 20cm3 of a 0.75M solution of the acid
- A. 0.015 mole
- B. 0.038 mole
- C. 3.800 moles
- D. 1.500 moles
Dissolving some pellets of NaOH in water would result in
- A. a decrease in the free energy of the solution
- B. a decrease in the entropy of the solution
- C. a lowering of the temperature of te solution
- D. an increase in the entropy of the solution
The salt formed from strong acid and a strong base is?
- A. complex
- B. neutral
- C. basic
- D. acidic
Tartaric acid is used industrially to
- A. make baking powder
- B. make fruit juices
- C. remove rust
- D. dry substance
How long would it take to deposit 0.08g of copper from CuCl\(_2\) solution by passing a current of 0.5A?
[Cu = 64, 1F = 96500 C mol-1]
- A. 6 mins
- B. 8 mins
- C. 24 mins
- D. 48 mins
C\(_2\)H\(_4\)(g) + H\(_2\)(g) โ C\(_2\)H\(_6\)(g) ฮH = -137kJ mol-1
The reaction represented above is
- A. exothermic
- B. spontaneous
- C. endothermic
- D. in equilibrium
What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution?
- A. The blue colour of the solution disappears
- B. Electrons flow from copper to zinc
- C. The zinc rod remain undissolved
- D. The copper generate more copper ions
The reaction that takes place in Daniell’s cell is
- A. direct combination
- B. redox
- C. double decomposition
- D. neutralization
H\(_3\)PO\(_4\)(aq) + H\(_2\)O(l) โ H\(_2\)PO\(^{4-}\)(aq) + H\(_3\)O\(^+\)(aq) ฮH = -13kJ at 298K
In the reaction above, an increase in temperature would
- A. slow down the reverse reaction
- B. have no effect on the reaction
- C. favour the reverse reaction
- D. favour the forward reaction
If chlorine is bubbled into water and the resulting yellowish-green solution is exposed to bright sunlight for a while, the solution will decompose giving out
- A. oxygen and leaving behind aqueous hydrochloric acid
- B. chlorine and oxygen
- C. oxygen, hydrogen and chlorine
- D. oxygen, thereby producing hypochlorous acid
Which of the following sets of metals dissolves in dilute HCl?
- A. Fe, Sn and Cu
- B. Mg, Fe and Cu
- C. Mg, Sn and Fe
- D. Cu, Mg and Sn
Copper and silver metals are commonly used as coin because they are
- A. easily reduced
- B. not easily reduced
- C. easily oxidized
- D. not easily oxidized
Cu\(^{2+}\)(aq) + 4NH\(_3\)(g) โ [Cu(NH\(_3\))\(_4\)]\(^{2+}\)(aq)
In the reaction above, what is the effect of precipitating Cu\(^{2+}\)(aq) as CuS(s)?
- A. NH3(g) concentration will decrease
- B. more NH3(g)
- C. The equilibrium will shift to the right
- D. There will be no effect
The tincture of iodine means iodine dissolved in
- A. ethanol and water
- B. bromine chloride
- C. chlorine water
- D. water
Na\(_2\)S\(_2\)O\(_3\)(aq) + 2HCl(aq) โ 2NaCl(aq) + H\(_2\)O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?
- A. An increase in temperature and decrease in the concentration of the reactant
- B. A decrease in the volume and increase in the pressure of the reactant
- C. A decrease in the temperature and an incease in the concentration of the reactant
- D. An increase in temperature and an increase in the concentration of the reactant
The reddish-brown rust on iron roofing sheets consists of
- A. Fe3+(H2O)6
- B. FeO.H2O
- C. Fe2O3.3H2O
- D. Fe3O4.2H2O