Periodic Table MC

Which of the statement(s) below is/are true?

1) Elements in the same group have the same number of electrons.

2) Elements in the same group have similar chemical reactions.

3) Elements in the same group have different mass and proton numbers.

• 1, 2 and 3

• only 1 and 2

• only 2 and 3

• only 1

What causes the trend in first ionisation energy from left to right across the PT?

• Greater number of electrons

• Grater shielding

• Increased nuclear charge

• Larger atomic radii

What causes the largest changes in melting point across period 2 elements?

• Change in bonding structure

• Greater electronegativity

• Greater number of electrons

• Increase in nuclear charge

When Group 2 ions form, the outer electrons are found in...

• s orbitals

• p orbitals

• d orbitals

• f orbitals

Which reaction does not involve the oxidation of magnesium?

• Mg reacting with hydrochloric acid

• MgCO₃ + HNO₃

• Mg + O₂

• Mg reacting with water (steam)

Which is the most soluble in water?

• Mg(OH)₂

• Ca(OH)₂

• Sr(OH)₂

• Ba(OH)₂

Which will not result in a reaction?

• potassium bromide with aqueous iodine

• potassium bromide with silver nitrate

• potassium iodide with chlorine water

• potassium iodide with silver nitrate

What colour change will be seen in the following reaction?

2 NaI (aq) + Cl₂ (aq) → I₂ (aq) + 2 NaCl (aq)

• Brown to pale green

• Pale green to brown

• Colourless to purple

• Orang to colourless

Which test will identify Na₂SO₄?

• Reaction with acid causing effervescence

• Reaction with BaCl₂ forming a white precipitate

• Reaction with silver nitrate forming a precipitate

• Reaction with sodium hydroxide forming a characteristic gas which turns blue litmus to red

Which test will identify NH₄NO₃?

• Reaction with acid causing effervescence

• Reaction with BaCl₂ forming a white precipitate

• Reaction with silver nitrate forming a precipitate

• Reaction with sodium hydroxide forming a characteristic gas which turns blue litmus to red