AS & A Level Chemistry 3.1 Electronegativity and bonding : Exam Style Questions Paper 1


Elements X, Y and Z are all in the first two periods of the Periodic Table.
Their Pauling electronegativity values, \(E_N\), are shown.

Substances exist with formulae XZ, YZ and \(Z_2\).
Which row puts these substances in order of increasing melting point?


Ans: C


Which type of interaction exists between water molecules and metal cations in aqueous solution?

A    dipole-dipole interactions
B    hydrogen bonds
C    ion-dipole interactions
D    ionic bonds


Answer       C


Liquids X and Y do not react with one another. They have identical boiling points.

When a particular volume of X is shaken with a similar volume of Y, they form a liquid mixture Z. The average intermolecular forces in liquid Z are stronger than the average of the forces in X and the forces in Y.

Which deductions from this information are correct?

1 The mixing of X and Y is exothermic.
2 The vapour pressure of liquid Z will be less than that of either liquid X or liquid Y at the same temperature.
3 The boiling point of liquid Z will be lower than that of either liquid X or liquid Y at the same pressure.


Answer     B


Which statements are correct?

1 The hydrogen bonds in ice are more regularly arranged than in water.

2 The solidification of water to form ice is exothermic.

3 Pure water is less dense than ice.


Answer       B

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