Which of the following statements is true about this compound?

Q: Which of the following statement describes a compound?

Answer and Explanation: The correct answer is the choice b; a material that is made up of a combination of atoms bonded together. Chemical compounds consist of two or more types of elements that are held together with chemical bonds such as covalent or ionic.

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The correct options are AIt is a pure substance.BIts constituents are combined chemically.CIts constituents do not retain their individual properties.In a compound, the constituent substances are combined chemically in a fixed ratio and cannot be separated by physical methods. Irrespective of the source or origin, the ratio of the masses of the combining elements remain constant, for example, water sourced from tap or rain has the same chemical formula, H2O.Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). We know compounds are the physical aggregation of one type of molecules, hence compounds are pure substances.
Answer (Detailed Solution Below)
Which of the following statement is true about a compound?
Which of the following statement describes a compound?
Which of the following statements is not true about the compound?
What is true about element and compounds?

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Its constituents are combined chemically.

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Its constituents do not retain their individual properties.

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It can be separated by physical methods into its constituents.

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Solution

The correct options are AIt is a pure substance.BIts constituents are combined chemically.CIts constituents do not retain their individual properties.In a compound, the constituent substances are combined chemically in a fixed ratio and cannot be separated by physical methods. Irrespective of the source or origin, the ratio of the masses of the combining elements remain constant, for example, water sourced from tap or rain has the same chemical formula, H2O.Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). We know compounds are the physical aggregation of one type of molecules, hence compounds are pure substances.

The constituents can be separated only by chemical or electrochemical reactions.
Compounds have a variable composition.
The composition of each new substance is always ﬁxed.
Elements react to form new compounds.

Answer (Detailed Solution Below)

Option 2 : Compounds have a variable composition.

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The incorrect statement is Compounds have a variable composition.

Compounds have a fixed composition throughout the mass, Hence Option 2 is Not true.

Key Points

Properties of Compound
- A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass.
- A compound cannot be separated into its constituents by physical processes (It can only be separated into
  its constituents by chemical processes).
- The properties of a compound are entirely different from those of its constituents.
- Energy (in the form of heat, light, etc.) is usually given out or absorbed during the preparation of a compound.
- The composition of a compound is fixed, the constituents are present in a fixed proportion by mass.
- A compound has a definite formula.
- A compound has a fixed melting point, boiling point.

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Which of the following statement is true about a compound?

The true statement about compounds is- c) Compound is homogeneous and has a fixed composition. A compound is made up of two or more different elements that are evenly distributed throughout the compound. In a compound, the different elements are chemically combined in a definite proportion of their mass.

Which of the following statement describes a compound?

Answer and Explanation: The correct answer is the choice "b"; a material that is made up of a combination of atoms bonded together. Chemical compounds consist of two or more types of elements that are held together with chemical bonds such as covalent or ionic.

Which of the following statements is not true about the compound?

The incorrect statement is Compounds have a variable composition.

What is true about element and compounds?

Elements and compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen.