Which of the following is a spontaneous reaction at room temperature?
Correct answer: A. Lighting a matchstick
- A. Lighting a matchstick
- B. Boiling water
- C. Removing sodium chloride from water
- D. Increasing the height of a ball from the ground to an elevated table
Explanation
A spontaneous reaction is one that proceeds on its own once initiated. Lighting a matchstick is spontaneous after the initial ignition because the chemical reaction sustains itself without needing additional energy. In contrast, boiling water at room temperature, separating salt from water, and lifting a ball all require continuous or external energy inputs, and are therefore non-spontaneous processes.
Last updated
Related questions
48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?
A ballet dancer of mass 80 kg and a wingspan of 1m is executing a spin. She then folds her arms and brings them to within 20cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?