Tag: applied chemistry

Questions Related to applied chemistry

In which of the following type of nano material two  dimensions are outside the nano scale?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. One dimensional nano material

  2. Two dimensional nano material

  3. Three dimensional nano material

  4. Zero dimensional nano material

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Correct Option: B
Explanation:

In two-dimensional nanomaterials (2D), two dimensions are outside the nanoscale.This class exhibits plate-like shapes and includesgraphene, nanofilms, nanolayers, and nanocoatings.
Hencce option B is correct.

Which of the following nano materials are examples of  two dimensional nano materials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. nanocoatings.

  2. nanofilms, nanolayers

  3. graphene,

  4. A,B,C

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Correct Option: D
Explanation:

n two-dimensional nanomaterials (2D), two dimensions are outside the nanoscale. This class exhibits plate-like shapes and includes graphene, nanofilms, nanolayers, and nanocoatings.
Hence option D is correct.

An important parameter that determines the functioning of nano material is surface area to volume ratio. Because of which reason small granules of sugar dilute faster than big piece of sugar cube?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. SA/V ratio of sugar granules is smaller than sugar cube.

  2. Can not say anything without knowing temperature of solvent.

  3. SA/V ratio is same for sugar and sugar cube.

  4. SA/V ratio of sugar granules is greater than sugar cube.

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Correct Option: D
Explanation:

SA/V ratio of sugar granules is greater than sugar cube so in Sugar granules, a greater portion of sugar atoms will be on surface so contact with water will be more as compared to sugar cube and it will dissolve faster than big piece of sugar cube.

Thus nanoparticles have a much ____________ surface area per unit mass compared with larger particles.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Greater

  2. Lesser

  3. Equal

  4. None of the above

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Correct Option: A
Explanation:

Two principal factors cause the properties of nanomaterials to differ significantly from other materials: increased relative surface area, and quantum effects. These factors can change or enhance properties such as reactivity, strength and electrical characteristics.

As a particle decreases in size, a greater proportion of atoms are found at the surface compared to those inside. For example, a particle of size 30 nm has 5% of its atoms on its surface, at 10 nm 20% of its atoms, and at 3 nm 50% of its atoms.

Thus nanoparticles have a much greater surface area per unit mass compared with larger particles. As growth and catalytic chemical reactions occur at surfaces, this means that a given mass of material in nanoparticulate form will be much more reactive than the same mass of material made up of larger particles.

In which of the following type of nano-material, one dimension is outside the nano scale?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. One dimensional nano material

  2. Two dimensional nano material

  3. Three dimensional nano material

  4. Zero dimensional nano material

Show answer
Correct Option: A
Explanation:

In one-dimensional nanomaterials (1D), one dimension is outside the nanoscale. This class includes nanotubes, nanorods, and nanowires.
Hence option A is correct.

Which of the following nano materials are examples of  one dimensional nano materials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. nanorods

  2. nanotubes

  3. nanowires

  4. A,B,C

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Correct Option: D
Explanation:

In one-dimensional nanomaterials (1D), one dimension is outside the nanoscale. This class includes nanotubes, nanorods, and nanowires.
Hence option D is correct.

Which of the following nano materials are examples of  three dimensional nano materials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Nano tubes

  2. Grapherne

  3. Nano coating

  4. None of the above

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Correct Option: A
Explanation:

Three-dimensional nanomaterials (3D) are materials that are not confined to the nanoscale in any dimension. This class can contain bulk powders, dispersions of nanoparticles, bundles of nanowires, and nanotubes as well as multi-nanolayers. Hence option A is correct.

Quantum dots are semiconductor nano particles that are about________  nm in diameter.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. 1-100

  2. 0.1-10

  3. 100-1000

  4. 1000-10000

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Correct Option: A
Explanation:

Quantum dots are semiconductor nanoparticles that are about 1-100 nm in diameter.

Nano science is the study of objects of particles of

nanochemistry nanotechnology applied chemistry materials chemistry

  1. smaller size

  2. medium size

  3. bigger size

  4. Both a and b

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Correct Option: A
Explanation:

Nano science is the study of objects of particles of smaller size of 1-100 nm. Nano particles are such small sized particles. Hence, option A is correct.

Which of the following nano materials are examples of  zero dimensional nano materials?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Diamond

  2. Fullarene

  3. Nano particles

  4. Graphite

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Correct Option: B
Explanation:

Accordingly, in zero-dimensional (0D) nanomaterials all the dimensions are measured within the nanoscale (no dimensions are larger than 100nm). Most commonly, 0D nanomaterials are nanoparticles.
Hence option B is correct.