SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Water
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Nitrogen
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Carbon
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Sulfur
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Detailed explanation-1: -Hydrogen, oxygen and nitrogen are elements as each of them are made up of two identical atoms. Whereas water is made up of two hydrogen atoms and one oxygen atom, therefore it is not an element.
Detailed explanation-2: -Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.
Detailed explanation-3: -Silica is not an element rather it is a compound that is composed of silicon and oxygen atoms. The chemical formula of silica is .
Detailed explanation-4: -Water is a compound because of the following reasons: It is composed of two different elements, hydrogen and oxygen which cannot be separated by physical methods. They can be separated only by chemical methods.
Detailed explanation-5: -water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states.