Ethene molecules can be added to one another to form a long chain compound called a
- A. dimer
- B. monomer
- C. polymer
- D. trimer
Reduction is the process of
- A. loss of electron
- B. loss of hydrogen
- C. loss of oxygen
- D. addition of electronegative elements
The reaction that occurs all the anode when CuSO4(aq) is electrolyzed using carbon electrode is
- A. 2H - (aq) + 2e โ H 2(g)
- B. Cu2+ (aq) + 2e โ Cu (s)
- C. 4OH (aq) -4e โ 2H2O(l) + O2 (g)
- D. SO4(aq)2 -2e โ SO 2(g) + O2(g)
Consider the reaction represented by the following equation: N2(g) + 3H2(g) โ 2NH3(g); โHฯด = -xkJ mol-1. Which of the following conditions would increase the yield of NH3?
- A. Addition of iron catalyst
- B. Increase in the temperature of the system
- C. Increase in the volume occupied by reactants
- D. Increase in the total pressure of the system
Which of the following factors would affect the equilibrium constant?
- A. Concentration
- B. Temperature
- C. Pressure
- D. Volume
Consider the reaction represented by the following equation: Na2CO3(aq) + 2HCl(aq) \(\longrightarrow\) 2NaCl(aq) + H2O(l) + CO2(g) . What volume of 0.02 mol dm-3 Na2CO3(aq) would be required to completely neutralize 40 cm3 of 0.10 mol dm-3 HCl(aq)?
- A. 200 cm3
- B. 100 cm3
- C. 40 cm3
- D. 20 cm3
Which of the following salts on hydrolysis would give an alkaline solution?
- A. NH4CI(s)
- B. AICI3(s)
- C. CH3COONa(s)
- D. NH4NO3(s)
The gases produced when Cu(NO3)2(s) was heated are
- A. NO and NO2
- B. O2 and NO
- C. NO2 and N2O4
- D. O2 and NO2
Which of the following substances with the corresponding pH value is an alkali?
Substance pH
- A. Lime 2.4
- B. Banana 4.6
- C. Distilled water 7.0
- D. Milk of magnesia 10.5
Zinc oxide is said to be amphoteric because it
- A. forms an acid salt
- B. is an insoluble base
- C. forms a double salt
- D. reacts with a base or an acid
The type of energy changes that accompany the mixing of a strong acid to a strong base is
- A. electrical
- B. heat
- C. light
- D. sound
Which of the following statements about volatile liquids is correct? They have
- A. high vapour pressure and low boiling point
- B. high vapour pressure and high boling point
- C. low vapour pressure and low boining point
- D. low vapour pressure and high boiling point
The vapour pressure of a given volume of liquid increase when the
- A. liquid becomes saturated with a salt
- B. Volume of the liquid increases
- C. temperature of the liquid falls
- D. temperature of the Liquid rises
Which of the following relationships correctly expresses the Boyle’s law?
- A. P \(\alpha\) V at constant T
- B. V \(\alpha\) T at constant P
- C. P \(\alpha\) \(\frac{1}{V}\) at constant T
- D. V \(\alpha\) \(\frac{1}{T}\) at constant P
Which of the following statements about a chemical system in equilibrium is correct/ The
- A. reaction is irreversible
- B. reaction goes to completion
- C. equilibrium is re-established when a stress is applied
- D. equilibrium position is affected by catalyst
The mass of 800cm3 of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros constant = 22.4dm3 mol-1`]
- A. 18.0 gmol-1
- B. 22,4gmol-1
- C. 28.0gmol-1
- D. 36.0 gmol-1
If 0.20 mol dm-3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)
- A. 600cm-3
- B. 625cm3
- C. 10003
- D. 1600 cm 3
The oxidation number of sulphur in Fe2(SO4)3 is
- A. +2.
- B. +3
- C. +4.
- D. +6.
A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)
- A. 1:1
- B. 2:1
- C. 1:4
- D. 8:1
An aqueous solution of Na2CO3 is
- A. acidic
- B. alkaline
- C. amphoteric
- D. neutral
How many lone pair (s) of electrons is present in HF?
- A. o
- B. 1
- C. 2
- D. 3