A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

• A. sulphur (lV) oxide
• B. hydrogen sulphide
• C. sulphide (lV) oxide
• D. hydrogen chloride

A transition metal would be expected to

• A. from oxides with different formulae
• B. have strong oxidizing ability
• C. have low density
• D. have an atomic structure with an incomplete outermost shell

What is the value of x in the following equation? Cr₂O₇^2- + 14H+ xe_-→ 2Cr₃₊ + 7H₂O

• A. 1
• B. 6
• C. 8
• D. 12

A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

• A. alpha particles and gamma rays
• B. alpha and beta particles
• C. beta particles and gamma rays
• D. alpha particles only

Water molecules can be liquids especially when they are bonded to

• A) alkaline earth metals
• B) alkali metals
• C) transition metals
• D) group VII elements

The electronic configuration in the ground state of the chloride ion (Cl\(^-\)) is

• A)
  1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^5\)
• B)
  1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^6\)
• C)
  1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^7\)
• D)
  1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^8\)

When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is

• A. Al₂N
• B. Al₂N₂
• C. AlN
• D. Al₂N₃

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

CH4(g) + Cl2(g) → CH3 Cl(s) + HCl(g) The major factor that influence the rate of the reaction above is

• A) catalyst
• B) temperature
• C) concentration
• D) light

\(^{114}_{55}Cs \rightarrow ^{A}_{Z}E + ^{4}_{2}\alpha\)

Find the value of A and Z in the equation above

• A) 119, 53
• B) 110, 57
• C) 110, 53
• D) 110, 58