Tag: chemistry

Questions Related to chemistry

The constituents of the mixture are easily seen with naked eyes. Then the mixture is ____________.

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. Homogenous

  2. Heterogenous

  3. Both (a) and (b)

  4. None of these

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Correct Option: B
Explanation:

The homogenous mixture consists of different components which are uniformly distributed in the solution and it can't be seen with naked eyes.

The heterogeneous mixture consists of two or more parts which have different compositions. These have visible boundaries of separation between the different constituents and can be easily seen even with naked eyes.

When sunlight passes through the window of a classroom, its path is visible. This is due to ________ of light. 

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. reflection

  2. scattering

  3. saturation

  4. absorption

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Correct Option: B
Explanation:

Due to Tyndall effect, there occurs scattering of light and the path becomes visible. The dust particles scatter the beam of light.

Which of the following statement(s) is\are not correct?

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. $\text{An element of a substance contains only one kind of atom}$

  2. $\text{A mixture is not always heterogeneous}$

  3. $\text{Elements can exist as atoms or molecules but compounds exist only as molecules}$

  4. $\text{Atoms of same element have always same atomic mass number}$

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Correct Option: D
Explanation:

Atoms of the same element can have different mass numbers and they are known as isotopes.


For example,

Hydrogen have $3$ isotopes.
$H_1^1, \ D_1^2, \ T_1^3$


Hence, option $D$ is an incorrect statement.

The example of heterogeneous mixture is:

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. Water and stone.

  2. Water and lemon juice.

  3. Water and alcohol.

  4. Water and sugar.

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Correct Option: A
Explanation:

A heterogeneous mixture is simply any mixture that is not uniform in composition. Two immiscible liquids form heterogeneous mixtures.

In given examples, water & lemon juice, water & alcohol, water & sugar result in uniform composition forming homogeneous mixture.
$\therefore$ Water and stone is a heterogeneous mixture.

A mixture of $100mL$ of $CO,CO_2$ and $O_2$ was sparked. When the resulting gaseous mixture was passed through $KOH$ solution, concentration in volume decrease by $80mL$,. the composition of initla mixture may be (in the same order).
(a) $30mL,60mL,10mL$ (b) $30mL,50mL,20mL$ (c) $50mL,30mL,20mL$ (d) $20mL,70mL,10mL$

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. a and c

  2. a and b

  3. b and d

  4. c and d

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Correct Option: B

Molecules is the smallest particle of _______________

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. compound

  2. substance

  3. mixture

  4. element

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Correct Option: C

Two solid mixtures are :

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. steel.

  2. solder.

  3. phosphor bronze.

  4. all of these.

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Correct Option: D
Explanation:

All of them are alloys. Alloy is a material which is composed by mixing two or more metals or a metal and a non-metal. An alloy may be a solid solution of the elements (a single phase), a mixture of metallic phases (two or more solutions) or an intermetallic compound with no distinct boundary between the phases.
Examples of alloys are steel, solder, brass, pewter, phosphor bronze and an amalgam.

The separation of mixture depends on :

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. boiling point

  2. solubility

  3. magnetic nature

  4. all of these

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Correct Option: D
Explanation:

Separation of mixture basically depends on the physical and chemical properties of the components. These factors are state, melting and boiling point, solubility, magnetic nature etc.

A mixture refers to the physical combination of two or more substances on which the chemical identities are retained and are mixed in the form of solutions, suspensions, and colloids.

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. True

  2. False

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Correct Option: A

Soil is a homogeneous mixture.

Write true or flase.

chemistry separation of substances substances and mixtures formation of mixtures and types of mixtures based on states types of mixtures

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Soil is a heterogeneous mixture.

 So,option-B is correct.