Tag: pure substance and mixtures

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Questions Related to pure substance and mixtures

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

A compound is always ______ whereas a mixture is :

  1. Heterogenous, both heterogenous and homogenous

  2. Homogenous, heterogenous

  3. Homogenous, Both homogenous and heterogenous

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compound is made up of two or more pure substances which are always homogenous. Mixtures contains two or more pure substances physically combined which may be homogenous or heterogenous

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following is a pure gas?

  1. Ntural gas

  2. Water gas

  3. Laughing gas

  4. Coal gas
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pure gas is not a mixture.


Natural gas consists of a mixture of gases like methane, higher alkanes, carbon dioxide etc. So it is not a pure gas.

Similarly, water gas is a mixture of $CO, H _2S$
Coal gas is a mixture of $H _2,CH _4,CO$
But laughing gas is only $N _2O$, So it is pure gas.


Hence, the correct option is $C$

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following obey the law of constant proportions in their formation?

  1. Mixtures

  2. Compounds

  3. Elements

  4. Colloids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A compound always follow the law of constant proportions because in a compound the elements that are present are always in the constant ratio.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Among the following, which is\are the difference between compound and mixture?

  1. The constituents of a compound can be separated only by chemical methods.

    The constituents of a mixture can be separated easily by physical methods.

  2. Compounds are pure substances.

    Mixtures are impure substances.

  3. The constituents of a compound are present in a fixed ratio.

    The constituents of a mixture are present in varying ratios.

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Compounds are pure substances whereas mixture are impure substances. The constituents of a compound can be separated only by chemical methods and that of a mixture can be separated easily by physical methods. The constituents of a compound are present in a fixed ratio.The constituents of a mixture are present in varying ratios.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

_____is chemically mixed whereas____is physically combined.

  1. Element, compound

  2. Compound, mixture

  3. Mixture, compound

  4. Mixture, element
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Compound is made up of two or more elements that are chemically combined whereas mixtures are made up of two or more pure substances that are physically combined. 

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following is not a property of mixtures?

  1. Components of mixtures are present in a varying proportions

  2. They are always homogeneous

  3. The components of mixtures retain their original properties

  4. The components of mixtures can be separated by physical means
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mixtures can be homogeneous or heterogeneous. Oil and Water is a heterogeneous mixture.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Each component of a ______ retains its individual properties.

  1. Compound

  2. Element

  3. Mixture

  4. Solute
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Matter that consists of two or more substances which may be elements, compounds or both mixed together physically in any proportion, but not chemically combined is called as a mixture. Each component of a mixture retains its individual properties. 

For example, we could mix various proportions of hydrogen and oxygen gas, as long as you do not ignite the mixture, the combination will form a mixture that can be separated.