EL Multiple Choice Questions

Question 1

Which element has the outer shell configuration 5s²5p²?

• Lead
• Strontium
• Tin
• Zirconium

Answer 1

• Tin

Question 2

A compound has the formula XY₂. It is soluble in water and has a high melting point, and conducts electricity when molten or aqueous.

Which row shows the most likely identities for elements X and Y?

Answer 2

• C

Question 3

A phosphide ion with mass number 31 has the formula P^3–.

Which row shows the number of protons, neutrons and electrons in a phosphide ion?

Answer 3

• D

Question 4

Which type of bonding is not present in ammonium chloride, NH₄Cl?

• Covalent bonding
• Dative covalent bonding
• Ionic bonding
• Metallic bonding

Answer 4

• Metallic bonding

Question 5

A student carries out a flame test on a white solid compound. The flame is green.

The student then makes a solution of the sample and adds dilute nitric acid and silver nitrate solution, which results in a white precipitate.

What is the identity of the compound?

• Barium carbonate
• Barium chloride
• Barium sulfate
• Copper(II) chloride

Answer 5

• Barium chloride

Question 6

Which molecule has a trigonal planar shape?

• BF₃
• NH₃
• PF₃
• PF₅

Answer 6

• BF₃

Question 7

Element P and Element Q are in the same period of the periodic table. Element P has a higher first ionisation enthalpy than Element Q.

What is a possible explanation for this?

• Element Q has its outer electrons in a higher energy level (shell).
• Element P contains more protons in its nucleus.
• Element P has a greater atomic radius.
• Element P has its outer electrons in a higher sub-shell.

Answer 7

• Element P contains more protons in its nucleus.

Question 8

Copper(II) sulfate can be prepared by reacting solid copper(II) oxide with sulfuric acid.

A student wants to calculate the percentage yield of this reaction.

Which statement regarding the experiment is correct?

• The exact volume of acid is not important because it is in excess.
• The exact volume of acid is not important because it is evaporated off at the end of the reaction.
• The acid should be added to the copper(II) oxide slowly, using a burette.
• The exact mass of the copper(II) oxide is not important because it is in excess.

Answer 8

• The exact mass of the copper(II) oxide is not important because it is in excess.

Question 9

A Group 2 element reacts vigorously with water to produce a soluble hydroxide. The hydroxide forms a white precipitate when neutralised by sulfuric acid and forms a carbonate which is very stable to heat.

What is the identity of the Group 2 element?

• Magnesium
• Calcium
• Strontium
• Barium

Answer 9

• Barium

Question 10

Which of the following statements is/are true for both absorption and emission spectra?

1. The frequency of the lines can be used to identify the element present.
2. The lines become closer together at higher frequencies.
3. The spectra will consist of black lines on a coloured background.

• 1,2, and 3
• Only 1 and 2
• Only 2 and 3
• Only 1

Answer 10

• Only 1 and 2