In a vacuum chamber where there is no air resistance, both objects will fall with the same acceleration due to gravity. According to the law of universal gravitation, the gravitational force acting on an object is proportional to its mass. However, the mass cancels out when calculating the acceleration due to gravity.
Therefore, regardless of their masses, both the 1 kg object and the 10 kg object will reach the ground at the same time. They will experience the same acceleration and fall with the same speed, so there will be no difference in their time of descent.