Mixtures and their Types Questions in English

(N/A) Homogeneous mixture:
$1$. Its constituent particles cannot be seen easily.
$2$. There are no visible boundaries of separation in a homogeneous mixture.
$3$. Its constituents cannot be easily separated.
$4$. Examples: Alloys,solution of salt in water,etc.
Heterogeneous mixture:
$1$. Its constituent particles can be seen easily.
$2$. It has visible boundaries of separation between the constituents.
$3$. Its constituents can be separated by simple physical methods.
$4$. Examples: Mixture of sand and common salt,mixture of sand and water,etc.

(N/A) Homogeneous mixture:
$1$. Its constituent particles cannot be seen easily.
$2$. There are no visible boundaries of separation in a homogeneous mixture.
$3$. Its constituents cannot be easily separated.
$4$. Examples: Alloys,solution of salt in water,etc.
Heterogeneous mixture:
$1$. Its constituent particles can be seen easily.
$2$. It has visible boundaries of separation between the constituents.
$3$. Its constituents can be separated by simple physical methods.
$4$. Examples: Mixture of sand and common salt,mixture of sand and water,etc.

(N/A) pure substance consists of only one type of particles,whereas a mixture contains two or more substances mixed in any proportion.
$(a)$ Common salt $(NaCl)$: Pure substance (it is a compound with a fixed chemical composition).
$(b)$ Soap: Mixture (it is a complex mixture of sodium or potassium salts of fatty acids,water,and additives).
$(c)$ Soil: Mixture (it contains sand,clay,organic matter,water,and air in varying proportions).
$(d)$ Rubber: Pure substance (natural rubber is a polymer of isoprene,$C_5H_8$,which is a single chemical compound).

(A) homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Examples: Air (gaseous solution),soda water (gas in liquid),vinegar (acetic acid in water),and filtered tea (solutes dissolved in water).
$A$ heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Examples: Wood (contains fibers,resins,and minerals) and soil (contains sand,clay,organic matter,and pebbles).

(A) homogeneous mixture is one that has a uniform composition throughout its mass.
$(i)$ Ice is a pure substance ($H_2O$ in solid state),which is homogeneous.
$(ii)$ Wood is a complex,heterogeneous mixture of cellulose,lignin,and other organic compounds.
$(iii)$ Soil is a heterogeneous mixture containing various particles,minerals,and organic matter.
$(iv)$ Air is a homogeneous mixture of various gases like nitrogen,oxygen,argon,and carbon dioxide.
Therefore,$(i)$ and $(iv)$ are homogeneous in nature.

(B, D) The 'Tyndall effect' is the scattering of light by particles in a colloid or a very fine suspension.
Among the given options,both milk and starch solution are colloids.
Therefore,they scatter a beam of light passing through them,exhibiting the 'Tyndall effect'.
Salt solution and copper sulphate solution are true solutions,which do not show the 'Tyndall effect'.

(N/A) pure substance consists of only one type of particles (atoms or molecules) with uniform chemical properties. In contrast,an impure substance,also known as a mixture,consists of two or more different types of particles or molecules mixed together in any proportion.

(B)

Pure substance	Mixture
$(i)$ It is made up of only one kind of particles (atoms or molecules).	$(i)$ It consists of two or more pure substances mixed together in any proportion.
$(ii)$ It has a fixed composition with fixed melting and boiling points. e.g.,Gold,water,carbon dioxide.	$(ii)$ It does not have a fixed composition or fixed melting and boiling points. e.g.,Air,soil,sea-water.

(N/A) Salt solution ($NaCl$ in water) is a solid-liquid homogeneous mixture where salt dissolves completely in water.
$(b)$ Air is a gas-gas homogeneous mixture consisting of nitrogen,oxygen,argon,and other gases.
$(c)$ Alloys like brass (copper and zinc) or bronze (copper and tin) are solid-solid homogeneous mixtures.
$(d)$ Muddy water or chalk powder in water are examples of solid-liquid heterogeneous mixtures.
$(e)$ $A$ mixture of oil and water is a liquid-liquid heterogeneous mixture as they form separate layers.

(B) homogeneous mixture is a mixture in which the composition is uniform throughout.
$(i)$ Ice is a pure substance ($H_2O$ in solid state), which is homogeneous.
(ii) Wood is a heterogeneous mixture consisting of various fibers and compounds.
(iii) Soil is a heterogeneous mixture containing sand, clay, organic matter, and minerals.
(iv) Air is a homogeneous mixture of various gases like nitrogen, oxygen, argon, and carbon dioxide.
Therefore, both ice and air are homogeneous in nature. The correct option is $(B)$.