Tag: chemistry

Questions Related to chemistry

The solute particles in a true solution are:

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. settle down

  2. do not settle down

  3. floats on the surface

  4. All of the above

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Correct Option: B
Explanation:

The some particles in a true solution do not settle down a true solution is clear and transparent. It do not scatter light.

Identify the heterogeneous mixture among the following:


( Brass, common salt and sulphur, water and oil, aerated water, steel )

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Common salt and sulphur, Water and oil

  2. Brass, Aerated water, Steel

  3. Common salt and sulphur, Steel, Brass

  4. All of the above

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Correct Option: A

Kerosene is an example of :

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. homogeneous mixture

  2. heterogeneous mixture

  3. both A and B

  4. none of the above

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Correct Option: A
Explanation:

Kerosene is an example of homogeneous mixture of many hydrocarbons. Properties and composition are uniform throughout.

Which sample is a homogeneous mixture?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Kl(aq)

  2. Fe(s)

  3. $CO _2$(g)

  4. $NH _3$(l)

  5. NaCl(s)

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Correct Option: A
Explanation:

${ CO } _{ 2 }$ and ${ NH } _{ 3 }$ are a compound as it is made up of different elements.${ Fe(s) } _{  }$ is a pure substance as it is made up of a single element.


$NaCl$ is also a pure substance.${ NH } _{ 3 }$ is a compound as it is made up of different elements.

$KI(aq)$ is a homogeneous mixture as its composition is uniform throughout the mixture.

Hence the correct option is A.

Just because you mix two things together does not necessarily mean that they will form a homogeneous mixture (a solution).
For example, if you add sodium chloride, $NaCl$, to a container that has both hexane and water, the $NaCl$ will dissolve into the water, but will not be found in the hexane $C _{6}H _{14}$.
Which of the following statements BEST explains these observations?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Polar water molecules form ion-dipole forces with the ions of $NaCl$. Hexane, being nonpolar, cannot form these ion-dipole interactions.

  2. Nonpolar hexane molecules tend to repel the ions that make up $NaCl$.

  3. Nonpolar hexane is less dense that water, so when the two are in the same container, any $NaCl$ that is added to the mixture sinks to the bottom of the container and cannot get into the hexane layer.

  4. Nonpolar hexane molecules and water molecules repel one another.

Show answer
Correct Option: A
Explanation:

NaCl is ionic in nature and soluble in polar solvent and insoluble in non-polar solvent like hexane because polar water molecules form ion-dipole forces with the ions of NaCl, which is not sceen in case of hexane.

Which substances show variations in composition on a particulate and macroscopic level?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. A pure element.

  2. A simple compound.

  3. A homogeneous solution.

  4. A heterogeneous mixture.

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Correct Option: D
Explanation:

A heterogeneous mixture show variations in composition on a particular and macro scope level. A heterogeneous mixture do not have uniform composition. it show variation at any level whether microscope or macroscopic.

A glass of iced tea is a/an:

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. homogeneous mixture

  2. heterogeneous mixture

  3. compound

  4. element

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Correct Option: B
Explanation:

A glass of iced tea is a heterogeneous mixture as it contains both solid and liquid phases simultaneously.

The mixture of gases used by deep-sea divers is helium-oxygen.

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. True

  2. False

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Correct Option: A
Explanation:

The main reason for adding helium to the breathing mixture is to reduce the proportions of nitrogen and oxygen below those of air, to allow the gas mixture to be breathed safely on deep dives. A lower proportion of nitrogen is required to reduce nitrogen narcosis and other physiological effects of the gas at depth.

Magnesium sulphate in water is a ______mixture.

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. solid-solid

  2. homogeneous

  3. heterogeneous

  4. colloidal

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Correct Option: B
Explanation:

Homogeneous mixture- it is a mixture of solids, liquids and gases that has the same proportions of its components in any sample,

Magnesium sulphate(Epsom salt) is also a homogeneous mixture.
The correct option is [B].

Which one of the following statement is incorrect?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. All elements are homogeneous

  2. Compound made up of a number of elements are heterogeneous

  3. A mixture is not always heterogeneous

  4. Air is a heterogeneous mixture

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Correct Option: D
Explanation:

Air is a mixture of gas in gas.

The mixture of gas in gas is always homogenous.
Thus, air is a homogenous mixture.