Which of the following properties does not describe a compound?

It is a pure substance

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It is composed of two or more elements

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It is mixed in any proportion by mass

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It has unique properties as compared to its constituents

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Solution

The correct option is C
It is mixed in any proportion by mass

A compound is a substance formed when two or more elements are chemically bonded together and has the following properties:

1. It is a pure substance.
2. It is composed of two or more elements.
3. It unique properties that are distinct from the properties of its elemental constituents. For example: water consists of hydrogen and oxygen. Hydrogen is combustible and oxygen is a supporter of combustion but water is used as a fire extinguisher.

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Similar questions

There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.

(a) What type of substance could X be? Name one substance like X.

(b) What type of substance could Y be? Name one substance like Y.

(d) Which process involves absorption or release of an appreciable amount of energy: formation of substances X or formation of substance Z?

(e) Name the three groups into which all the substances like Y are divided on the basis of their properties.

Q. Assertion :A mixture of oil & water retains the properties of its constituent compounds. Reason: In any mixture, the constituents retain the properties of their particles. This is because the formation of the mixture does not involve any chemical reaction or formation of the bonds between the constituents and the constituents retain their original properties.

Study the information given below:

1) Some substances are formed when two or more elements combined together chemically.
2) Properties of these substances are different from their respective constituents.
3) These substances cannot be broken down into their respective constituents by physical methods.

Which of the following substance has the properties listed above?

Q. Assertion :Elements and compounds are the examples of pure substances. Reason: The properties of a compound are different from those of its constituent elements.

Q. Assertion :Carbon monoxide is considered a compound but carbon and oxygen as elements. Reason: A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. While the compound is composed of two or more separate elements.

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