9th Grade > Chemistry
IS MATTER AROUND US PURE MCQs
Total Questions : 50
| Page 3 of 5 pages
Answer: Option C. ->
Saturated solution
:
C
In a solution, the solute is uniformly dissolved in the solvent. But there is a limit to how much solute can be dissolved and it depends on the temperature.
At any given temperature, only a certain amount of solute can be dissolved. When that point is reached, the solution is said to be saturated and we call it a saturated solution.
:
C
In a solution, the solute is uniformly dissolved in the solvent. But there is a limit to how much solute can be dissolved and it depends on the temperature.
At any given temperature, only a certain amount of solute can be dissolved. When that point is reached, the solution is said to be saturated and we call it a saturated solution.
Answer: Option B. ->
In a suspension, the particles can be seen by the naked eye whereas in a colloidal solution, they cannot be.
:
B and C
A suspension is prepared by mixing an insoluble solid in a liquid. The solid particles do not dissolve and are visible to the naked eye. They scatter a beam of light passing through it and make the path of the light visible.
A colloidal solution is a mixture in which the size of the particles is too small to be seen by the naked eye. But the size of the particles in a colloid is big enough to scatter light passing it through and make the path of the light visible.
:
B and C
A suspension is prepared by mixing an insoluble solid in a liquid. The solid particles do not dissolve and are visible to the naked eye. They scatter a beam of light passing through it and make the path of the light visible.
A colloidal solution is a mixture in which the size of the particles is too small to be seen by the naked eye. But the size of the particles in a colloid is big enough to scatter light passing it through and make the path of the light visible.
Answer: Option A. ->
True
:
A
Suspension is a heterogenous mixture in which the solute particles do not dissolve but remain suspended throughout the solvent.
The distribution of the solute particles is not uniform throughout the mixture. For example: muddy water
:
A
Suspension is a heterogenous mixture in which the solute particles do not dissolve but remain suspended throughout the solvent.
The distribution of the solute particles is not uniform throughout the mixture. For example: muddy water
Answer: Option A. ->
Top layer - kerosene oil
Bottom layer - water
:
A
Kerosene oil and water form a mixture of immiscible liquids. When left undistubed, depending upon the densities of the liquid they form separate layers. The liquid that has a lower density forms the top layer and the liquid that has a higher density forms the bottom layer.
In this case, kerosene has density of 820 kg/m3 and water has a density of 1000 kg/m3. So, kerosene forms the top layer and water forms the bottom layer.
Bottom layer - water
:
A
Kerosene oil and water form a mixture of immiscible liquids. When left undistubed, depending upon the densities of the liquid they form separate layers. The liquid that has a lower density forms the top layer and the liquid that has a higher density forms the bottom layer.
In this case, kerosene has density of 820 kg/m3 and water has a density of 1000 kg/m3. So, kerosene forms the top layer and water forms the bottom layer.
Answer: Option A. ->
9.09%
:
A
Mass percentage is used to measure the concentration of a solution. A solution contains solute and solvent.
Mass percentage of a solution =Mass of the soluteMass of the solution×100
Given, mass of solute = 10 g
mass of solvent = 100 g
The total amount of solution = 10 + 100 = 110 g
Mass percentage of a solution = 10110×100=9.09%
:
A
Mass percentage is used to measure the concentration of a solution. A solution contains solute and solvent.
Mass percentage of a solution =Mass of the soluteMass of the solution×100
Given, mass of solute = 10 g
mass of solvent = 100 g
The total amount of solution = 10 + 100 = 110 g
Mass percentage of a solution = 10110×100=9.09%
Answer: Option A. ->
Handpicking
:
A, B, and C
A heterogenous mixture contains physically distinct parts and have non-uniform composition.
So, sieving, handpicking and filtration are simple physical methods used to separate a heterogeneous mixture.
:
A, B, and C
A heterogenous mixture contains physically distinct parts and have non-uniform composition.
- Sieving is typically used for separating particles by size through a mesh as we notice near construction sites.
- Filtration is a method used for separating an insoluble solid from liquid using a filter paper.
- Handpicking is a method used to separate a mixture using hands.
- Distillation is a process used to separate components of a homogenous mixture. It involves heat and a sophisticated apparatus and does not come under 'simple physical methods.'
So, sieving, handpicking and filtration are simple physical methods used to separate a heterogeneous mixture.
Answer: Option A. ->
Blood
:
A, B, and D
A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.
∙ Brass is an alloy of zinc and copper and steel is an alloy of iron and carbon.
Alloys are considered as a homogeneous mixture of different components.
∙ Blood is a mixture of many compounds, minerals, water, etc.
∙ whereas, sugar can be considered as a compound as it is a carbohydrate molecule with a fixed composition of carbon, oxygen and hydrogen.
:
A, B, and D
A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties.
∙ Brass is an alloy of zinc and copper and steel is an alloy of iron and carbon.
Alloys are considered as a homogeneous mixture of different components.
∙ Blood is a mixture of many compounds, minerals, water, etc.
∙ whereas, sugar can be considered as a compound as it is a carbohydrate molecule with a fixed composition of carbon, oxygen and hydrogen.
Answer: Option C. ->
solid-solid
:
C
A solution is a homogeneous mixture of two or more substances. Alloy is a example of a solid-solid mixture as it is a mixture of two or more metals or a metal and a non-metal.
:
C
A solution is a homogeneous mixture of two or more substances. Alloy is a example of a solid-solid mixture as it is a mixture of two or more metals or a metal and a non-metal.
Answer: Option A. ->
interconversion between states of matter
:
A and B
The interconversion between states of matter is a physical change because the change is reversible. Although ice, water and water vapour all look different and display different physical properties, they are all chemically the same substance.
Breaking of glass is a physical change because only the size of the glass changes and no new substances formed after the glass breaks.
:
A and B
The interconversion between states of matter is a physical change because the change is reversible. Although ice, water and water vapour all look different and display different physical properties, they are all chemically the same substance.
Breaking of glass is a physical change because only the size of the glass changes and no new substances formed after the glass breaks.
Answer: Option A. ->
Sol
:
A
Colloids are classified according to the state of the dispersed medium and the dispersed phase. The dispersed phase of milk of magnesia is in the solid state and the dipersing medium is in the liquid state. As a result, milk of magnesia is classified as a sol.
:
A
Colloids are classified according to the state of the dispersed medium and the dispersed phase. The dispersed phase of milk of magnesia is in the solid state and the dipersing medium is in the liquid state. As a result, milk of magnesia is classified as a sol.
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