عبوری عناصر

Transition metals often form:

• 1 Only gases
• 2 Only colourless compounds
• 3 Only acids
• 4 Coloured compounds

The common oxidation states of iron are:

• 1 +1 and +4
• 2 0 only
• 3 +2 and +3
• 4 -1 and -2

A substance that acts as a catalyst in the Haber process is:

• 1 Platinum
• 2 Copper
• 3 Iron
• 4 Nickel

Complex ions form because transition metals have:

• 1 No electrons
• 2 Low melting points
• 3 Large charges only
• 4 Empty d orbitals that accept electron pairs

Which of these is not a transition metal?

• 1 Iron
• 2 Sodium
• 3 Chromium
• 4 Copper

Transition metals show variable oxidation states because they use:

• 1 Both ns and (n-1)d electrons
• 2 Only the s electrons
• 3 Only the p electrons
• 4 Neutrons

The colour of copper sulphate crystals is:

• 1 Green
• 2 White
• 3 Blue
• 4 Pink

An alloy of copper and zinc is:

• 1 Steel
• 2 Solder
• 3 Brass
• 4 Bronze