Tag: homogenous and heterogenous mixtures

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Questions Related to homogenous and heterogenous mixtures

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

Which of the following mixtures will be the most difficult to separate?

  1. Iron filings + sand

  2. Sand + water

  3. Saw dust + stones

  4. Nitrogen + hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen (N2) form ammonia (NH3) by a reaction with hydrogen (H2) using a metal catalyst under high temperatures and pressures. It is a chemical combination reaction. Hence the mixture of nitrogen and hydrogen is difficult to separate because a new product is formed.

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

Why alloys are always considered as mixtures?

  1. They have a fixed composition

  2. They shows the properties of its constituents

  3. They can be seperated into its constituents by physical method

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

Alloys are homologous mixtures of metals and cannot be separated into its constituents by physical methods. It is still considered a mixture because it shows the property of its constituents and can have variable composition.


Hence, the correct option is $\text{B}$

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

Identify the heterogeneous mixture among the following:


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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A heterogeneous mixture has non-uniform composition. Common salt and sulphur are distinct solid phases, and water and oil do not mix, forming two distinct layers.

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

Which sample is a homogeneous mixture?

  1. Kl(aq)

  2. Fe(s)
  3. $CO _2$(g)
  4. $NH _3$(l)

  5. NaCl(s)
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.