Tag: mix and separate

Quizzes (5) Questions (127)

Questions Related to mix and separate

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.

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

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

  1. A pure element.

  2. A simple compound.

  3. A homogeneous solution.

  4. A heterogeneous mixture.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. True

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

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

Magnesium sulphate in water is a ______mixture.

  1. solid-solid

  2. homogeneous

  3. heterogeneous

  4. colloidal
Reveal answer Fill a bubble to check yourself
B Correct answer
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].

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

Which one of the following statement is incorrect?

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

Air is a mixture of gas in gas.

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