Which of the following Group 1 elements has the highest ionization energy?
- A. 55Cs
- B. 37Rb
- C. 19K
- D. 11Na
- E. 3Li
Which of the following statements is correct about sodium chloride in the solid state?
- A. it exists as aggregates of ions
- B. it conducts electricity
- C. its melting point is below 100oC
- D. it exists as discrete molecules
- E. its ions are linked by metallic bonds
The valence electrons of element 12Mg are in the
- A. 1s orbital
- B. 2s orbital
- C. 2px orbital
- D. 2py orbital
- E. 3s orbital
Element X, with electronic configuration 2, 8, 2 and element Y with electronic configuration 2, 8, 7 are like to combine by
- A. metallic bonding
- B. covalent bonding
- C. electrovalent bonding
- D. dative bonding
- E. hydrogen bonding
If an element R belongs to the same group as sodium, an aqueous solution of ROH will
- A. be neutral
- B. be acidic
- C. be coloured
- D. have pH greater than 7
- E. turn back litmus red
An atom 17 protons, 17 electrons and 18 neutrons has a mass number of
- A. 17
- B. 18
- C. 34
- D. 35
- E. 52
Lead and tin are the components of
- A. steel
- B. bronze
- C. brass
- D. dentist amalgam
- E. soft solder
Which of the following is an ore of aluminium?
- A. Haematite
- B. Magnetite
- C. Siderite
- D. Bauxite
- E. Cassiterite
Which of the following metals is not extracted by electrolysis ?
- A. lron
- B. Sodium
- C. Calcium
- D. Magnesium
- E. Aluminium
The following oxides react with both acids and bases to form salts except
- A. zinc oxide
- B. lead (ll) oxide
- C. aluminium oxide
- D. tin (IV) oxide
- E. carbon (Iv) oxide
Which of the following is used as water softener?
- A. Na2CO3.10H2O
- B. CuSO4. 5H2O
- C. MgSO4. 7H2O
- D. CaCI2.2H2O
- E. Na2SO4. 10H2O
Which of the following when heated strongly in air will leave a metal as residue?
- A. Sodium trioxonitrate (V)
- B. Potassium trioxonitrate (V)
- C. Silver trioxonitrate (V)
- D. Lead (ll) trrioxonitrate(V)
- E. Aluminium trioxonitrate (V)
When chlorine is added to slaked lime, the product obtained is
- A. bleaching powder
- B. chlorinated water
- C. hydrochloric acid
- D. oxochlorate (l) acid
- E. trioxochlorate (V) salt
Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P (aq) + Q(aq) → V(s) + R(aq) + T(g)
- A. P
- B. Q
- C. V
- D. T
- E. R
The use of diamond in abrasives is due ti its
- A. high melting point
- B. durability
- C. lustre
- D. hardness
- E. octahedral shape
Which of the following is used widely in the manufacture of flavours and perfumes?
- A. Alkanoates
- B. Alkanones
- C. Alkanes
- D. Complex sugars
- E. Aliphatic compounds
Alkanes react with the halogens mainly by
- A. oxidation
- B. polymerization
- C. addition
- D. reduction
- E. substitution
The by-product of the fermentation of sugar to ethanol is
- A. propane -1,2,3-triol
- B. ethyl ethanoate
- C. ethanedioc acid
- D. propanol
- E. carbon (lV) oxide
Which of the following is the relative molecular mass of a compound which has empirical formula CH\(_2\)O? (H = 1; C = 12; O = 16)
- A. 42
- B. 45
- C. 126
- D. 180
- E. 145
The reaction between alkanoic acids and alkanols in the presence of a mineral acid is known as
- A. saponification
- B. hydrolysis
- C. polymerization
- D. esterification
- E. dehydration
Ethene undergoes mainly addition reactions because it is
- A. a gas
- B. a hydrocarbon
- C. unsaturated
- D. easily polymerized
- E. a covalent compound