Try Out Chemistry 11 grade

Which of the following statement describes the 1^st ionization energy?

• the energy needed to produce one mole of ions from one mole of gaseous atoms

• the energy needed to remove the nearest electron from nucleus from each atom in one mole of atoms of the element in the gaseous state to form one mole of gaseous 1+ ions

• the energy needed to remove the outermost electron from each atom in one mole of atoms of the element in the gaseous state to form one mole of gaseous 1+ ions

• the energy required to remove the nearest electron from nucleus from each atom in one mole of atoms of the element in the gaseous state to form one mole of gaseous 1+ ions

Which type of bonding occurs between PH₃ (phosphine ) and H⁺ (hydronium)?

• metallic bond

• hydrogen bond

• co-ordinate bond ( dative covalent bond )

• ionic bond

The following factors influence the ionization energies of an atom, Except :

1. The size of nuclear energy

2. The shielding effect of inner electrons

3. The number of neutrons

4. The distance of outer electrons from the nucleus

• 1,2,3

• 1 only

• 2 only

• 3 only

The following compounds contain ionic bond, Except :

1. hydrochloric acid (HCl)

2. magnesium chloride (MgCl₂)

3. sodium chloride (NaCl)

• 1,2, and 3

• 1 and 2

• 2 and 3

• 1 only

What is the correct label for each orbital?

• P_x, P_y, and P_z

• S, P_x, and P_y

• S, P_y, and P_z

• S, P_y, and P_z

Atom nickel (Ni) has atomic number 28.

Which one is the correct electronic configuration of the atom?

• [Ar] 3d¹⁰

• [Ar] 3d⁸ 4s²

• [Ne] 3d⁸ 4s²

• [Ne] 3d⁹ 4s¹

What are the shapes of the molecules of carbon dioxide and methane?

• A

• B

• C

• D

Urea is a product of animal metabolism. It can also be used as a fertilizer.

The diagram shows the angle Y in this molecule.

Which statements about the structure of urea are correct?

1. Angle Y is approximately 120°.

2. The molecule has two p bonds.

3. The molecule has only three lone pairs of electrons.

• 1,2, and 3

• 1 and 2

• 2 and 3

• 1 only

Electrons in full inner shells repel electrons in outer shells. Full inner shells of electrons prevent the full nuclear charge from being felt by the outer electrons.

What is explained in the text above?

• size of nuclear charge

• distance of outer electrons from nucleus

• shielding effect of inner electrons

• ionisation energy

Which atom has the electronic configuration [Ar]3d⁵4s¹?

• Nickel

• Chromium

• Manganese

• Magnesium