Which of the following is correct about the electrons in the 1s orbital? They
- A. have the same spin
- B. are easier to remove than those in the 2p orbital
- C. are closest to the nucleus
- D. have the same energy as those in the 2s orbital
- E. have different magnetic quantum numbers
Which of the following gases are diatomic except
- A. nitrogen
- B. helium
- C. hydrogen
- D. fluorine
- E. oxygen
An alkene may be converted to an alkane by
- A. halogenation
- B. hydrolysis
- C. dehydration
- D. hydrogenation
- E. decomposition
Producer gas is a mixture of
- A. oxygen and hydrogen
- B. Hydrogen and nitrogen
- C. nitrogen and oxygen
- D. nitrogen and carbon (ll) oxide
- E. hydrogen and carbon (ll) oxide
In which of the following pairs are both substances deliquescent?
- A. CaCI2 and H2SO4
- B. NaOH and MgSO4 7H2O
- C. CaCI2 and NaOH
- D. CUO and NaCI
- E. CaCO3 and MgCI2
Which of the following compounds of tin is a strong reducing agent?
- A. SnCI2
- B. SnCI4
- C. SnO2
- D. SnH4
- E. Sn(OH)2
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is
- A. Y2O
- B. YNO2
- C. Y2O3
- D. Y (NO2)2
- E. YO2
Examples of polymers include the following except
- A. starch
- B. nylon
- C. wool
- D. perspex
- E. glass
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
- A. Addition of washing soda
- B. Adding of soap
- C. Treatment with carbon exchange resin
- D. Filtration
- E. Distillation
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
- A. carbon(lV) oxide
- B. oxgyen
- C. water vapour
- D. nitrogen
- E. helium
Which of the following substances is a peroxide?
- A. Na2O2
- B. CuO
- C. PbO4
- D. Fe2O
- E. AI2O
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
- A. F < CI < Br < l
- B. l < Br < CI < F
- C. I < CI < Br < F
- D. Br < I < CI < F
- E. CI < F < I < Br
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
- A. 600cm-3
- B. 800cm-3
- C. 1,000cm-3
- D. 3,600cm-3
- E. 4,000cm-3
The following gases decolorize bromine water except
- A. C2H6
- B. C2H4
- C. C2H2
- D. C3H4
- E. C3H6
Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
- A. Stirring the mixture vigorously
- B. Adding more calcium chloride solution
- C. lncreasing the concentration of the ethanedioic acid
- D. Adding concentrated hydrochloric acid
- E. Adding some distilled water
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
- A. group lV elements
- B. group l metals
- C. transition metals
- D. alkaline earths
- E. the halogens
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
- A. 0.005 mole
- B. 0.025 mole
- C. 0.05 mole
- D. 1.00 mole
- E. 1.05 mole
Chlorine is is used in water treatment as
- A. a germicide
- B. a decolorizing agent
- C. an antioxidant
- D. a coagulating agent
- E. an aerating agent
In which of the following changes is ∆S negative ?
- A. H2O(l) → H2O(s)
- B. C(s) + 1/2O2,/sub>(g) → CO(g)
- C. PCI5(g) → PCl3(g) + Cl2(g)
- D. NaCl(s) + aq →Na+ (aq) + Cl- (aq)
- E. NH3(g) + HCl(g)
Sulphur burns in air to form
- A. an acidic oxide
- B. a basic oxide
- C. an amphoteric oxide
- D. a neutra oxide
- E. a mixed oxide
What does X atand for in the following expression? X = Log(10)(H+)
- A. Enthalpy change (∆H)
- B. Equilibrium constant (K)
- C. Solubility product
- D. Degree of acidity (pH)
- E. lonic product of water