Discussion
Surface tension of Br2(I) water and mercury are 41.0 mNm−1, 72.0 mN/m and 486.2 mNm−1 respectively at 25°C. These values imply that :
(i) Metallic bonding is weaker than covalent bonding
(ii) Hydrogen bonding is stronger than van der Waals bonding
(iii) Metallic bonding is stronger than hydrogen bonding
(iv) All types of intermolecular forces are of similar strength
Answer: B
The values imply (ii) and (iii).
Surface tension reflects the strength of the forces holding the liquid together. Bromine, held by van der Waals forces, has the lowest value (41.0 mN m−1); water, held by hydrogen bonds, is higher (72.0); and mercury, held by metallic bonding, is far higher (486.2).
So hydrogen bonding is stronger than van der Waals bonding (ii), and metallic bonding is stronger than hydrogen bonding (iii). Statement (iv) is contradicted by the twelvefold range of values, and statement (i) is not supported, since no liquid here is held by covalent bonds between molecules and mercury's value is the highest.
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