A compound a found in nature in the form of oxides on reaction with water form a compound b
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When carbon reacts with oxygen it forms carbon dioxide. this carbon dioxide is a gas. gases do not possess melting point. so option B is not correct Silicon reacts with oxygen and forms silicon dioxide. This is insoluble in water. so option C is not correct Iron reacts with oxygen and forms Iron dioxide. This is insoluble in water. so option D is not correct Calcium reacts with oxygen and forms calcium oxide. This calcium oxide dissolves in water and forms calcium hydroxide. The melting point of calcium oxide is nearly 2,5000C. So the answer is A
Which process involves developing an approximation of the monetary resources needed to complete project activities a estimate costs b control costs c determine budget d plan cost management?