If pressure decreases, then volume will decrease

Question

If volume increases, then temperature will decrease

which is true

Answer 1

The first statement is not necessarily true. The relationship between pressure and volume is described by Boyle's Law, which states that if pressure decreases, volume will increase, not decrease.
The second statement is true. The relationship between volume and temperature is described by Charles's Law, which states that if volume increases, temperature will decrease if pressure remains constant.