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Which element is essential for photosynthesis and found in chlorophyll?
Which of the following is a greenhouse gas?
What type of reaction occurs when an acid reacts with a base?
Which subatomic particle has no electric charge?
Which metal is liquid at room temperature?
What is the process of converting a gas into a liquid called?
What is the valency of Oxygen?
Which of these elements is a halogen?
Which of these is an example of a physical change?
What is the main component of natural gas?