Question

An increase in pressure increases the melting point. This statement is true for

• A. ice and brass
• B. silver and gold
• C. brass and gold
• D. Ice and silver

Answer 1

The correct option is B

silver and gold

Explanation for the correct option: (B)

• A substance's melting point (or, more rarely, liquefaction point) is the temperature at which it transitions from solid to liquid.
• The melting point of substances that contract when melted (such as ice and polythene) increases as pressure increases.
• On the other hand, as pressure rises, the melting point of substances that expand when melted (such as wax and lead) rises.

Only silver and gold are substances that can be expanded on melting. So, the given statement is true for silver and gold.

Explanation for the incorrect option:

(A). In ice and brass, both can be contracted when melted. So, the melting point decreases with the increase in pressure.

(C). In ice and brass, ice can be contracted when melted. So, the melting point decreases with the increase in pressure.

(D). In brass and gold, brass can be contracted when melted. So, the melting point decreases with the increase in pressure.

Conclusion: Hence, the correct option is B.