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Chemistry Answer the following questions:

Green Chemistry and Nanochemistry · Maharashtra Board STD 12 Science (MSBSHSE - English Medium). 31 questions.

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31 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Which flower is an example of self-cleaning?
Answer
  • Lotus is an example of self cleansing.
  • Nanostructures on the lotus plant leaves are super hydrophobic, they repel water which carries dirt as it rolls off.
    Thus though lotus plant (Nelumbonucifera) grows in muddy water, its leaves always appear clean.
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Question 21 Mark
Give the full form (long form) of the names for the following instruments: SEM
Answer
Scanning Electron Microscope
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Question 31 Mark
Give the full form (long form) of the names for the following instruments: FTIR
Answer
Fourier Transform Infrared Spectroscope
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Question 41 Mark
Give the full form (long form) of the names for the following instruments: STM
Answer
Scanning Tunneling Microscope
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Question 51 Mark
Give the full form (long form) of the names for the following instruments: TEM.
Answer
Tunneling Electron Microscope
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Question 81 Mark
Name the scientist who discovered scanning tunneling microscope (STM) in 1980.
Answer
Gerd Binning and Heinrich Rohrer. (Nobel prize 1986)
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Question 101 Mark
Ridhima wants to detect structure of surface of materials. Name the technique she has to use.
Answer
Scanning electron microscopy (SEM)
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Question 121 Mark
Name the scientist who coined the word nanotechnology.
Answer
Nario Taniguchi (University professor at Tokyo in 1974).
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Question 141 Mark
Which are the sectors that are revolutionalized by nanoparticles ?
Answer
Electronics, energy sector and medical fields.
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Question 161 Mark
Name the analytical technique used to study the morphology (structure of surface) of a material.
Answer
Scanning electron microscopy (SEM)
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Question 171 Mark
Name the technique used to analyse particle size, crystal structure and geometry of a nanoparticle.
Answer
x-ray diffraction (XRD)
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Question 181 Mark
Give the steps involved in preparation of nanoparticle using sol-gel process.
Answer
Hydrolysis, polycondensation, drying, thermal decomposition.
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Question 231 Mark
Name the nanoparticles used in sunscreen.
Answer
Zinc oxide $( ZnO )$ and Titanium dioxide $\left( TiO _2\right)$.
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Question 241 Mark
Name the class of nanomaterial i.e. nanotubes, fibres, nanowires belong to.
Answer
Two dimensions are in the nanoscale.
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Question 251 Mark
Name the materials having structural components with at least one dimension in the nanometer scale.
Answer
Nanomaterials.
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Question 271 Mark
Which principle of green chemistry has its perspective largely towards petrochemicals?
Answer
Use of renewable feedstocks.
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Question 311 Mark
Name the development that meets the needs of the present, without compromising the ability of future generation to meet their own need.
Answer
Sustainable development
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