Periodicity and transition metals (First test)

For each question choose the answer you consider to be the best.

1. Which species has the same configuration of electrons as a Mg²⁺ ion?

A. Na atom

B. F⁺ ion

C. Ne atom

D. O^– ion

2. Which best defines electronegativity?

A. The energy required for an atom in the gaseous state to gain one electron.

B. The attraction between the nucleus and the outermost electron of an atom.

C. The attraction of an atom for a bonded pair of electrons.

D. The energy required for an atom to form a negative ion with a noble gas electron configuration.

3. Which is correct when the ionic or atomic radii are compared?

A. Ca²⁺ < Ca⁺

B. Cl^– < Cl

C. Na < Na⁺

D. B < C

4. Which properties increase in value when descending group 1?

I. First ionization energy

II. Atomic radius

III. Reactivity with water

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

5. Which statement about a periodic trend is correct?

A. Melting points decrease from lithium to caesium.

B. Atomic radii increase from sodium to chlorine.

C. Electronegativities increase from fluorine to iodine.

D. First ionization energies increase from carbon to lead.

6. Why do the boiling points of the halogens increase down the group?

A. The molecules become more polar due to increasing electronegativities.

B. The strength of the temporary dipoles increases.

C. The bond enthalpies increase.

D. The ionization energies increase.

7. Which react with water to form acidic solutions?

I. Sodium oxide, Na₂O

II. Phosphorus pentoxide, P₄O₁₀

III. Sulfur trioxide, SO₃

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

8. Which of the following reacts with water to give a solution with a pH > 7?

A. Silicon dioxide

B. Sodium chloride

C. Sulfur trioxide

D. Magnesium oxide

9. Which statements are correct about the nature of Na₂O, SiO₂ and Cl₂O?

10. Which two elements react the most vigorously with each other?

A. Potassium and iodine

B. Potassium and fluorine

C Lithium and iodine

D. Lithium and fluorine

11. Which statement is true about the values for the electronegativity of the two elements?

A. Li > K

B. Li > B

C. Br > F

D. N > O

12. Which reactions are spontaneous under standard conditions?

I. Cl₂(aq) + 2NaBr(aq) → Br₂(aq) + 2NaCl(aq)

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

III. I₂(aq) + 2KBr(aq) → Br₂(aq) + 2KI(aq)

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

13. Which is a correct statement about the spectrochemical series?

A. It lists transition metals in order of their ability to absorb visible light.

B. It lists ligands in order of their ability to split the d orbitals of transition metals.

C. It lists the oxidation states of individual transition metals in order of their ability to absorb visible light.

D. It lists transition metals in order of their ability to transmit visible light.

14. Which statement is correct about the iron(II) ion?

A. Aqueous solutions of the ion are yellow-brown in colour.

B. It forms the [Fe(H₂O)₆]²⁺ complex ion in aqueous solution.

C. Its electron configuration is [Ar]4s²3d⁴.

D. It can be oxidized to the iron(III) ion by carbon monoxide.

15. Which of the following form a coloured solution in water?

I. Cu(NO₃)₂

II. Zn(NO₃)₂

III. Ni(NO₃)₂

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

16. Which electrons are lost when copper metal forms the Cu²⁺ ion?

A. two s electrons

B. two d electrons

C. two p electrons

D. one s electron and one d electron

17. Which are typical properties of transition metal elements?

I. They form complex ions

II. They are good catalysts

III. They have variable oxidation states

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

18. Which substance is used as a catalyst in the industrial mIB Docs (2) Teamfacture of ammonia?

A. V₂O₅

B. Pd

C. Fe

D. MnO₂

19. Which substance is used as a catalyst in catalytic converters in cars?

A. Pd

B. MnO₂

C. Fe

D. V₂O₅

20. How are cyanide ions behaving in the reaction below?

[Fe(H₂O)₆]²⁺ + 6CN^–(aq) → [Fe(CN)₆]^4– + 6H₂O(l)

A. As an oxidizing agent

B. As a reducing agent

C. As a Lewis acid

D. As a Lewis base

Answers

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