2016 · Q64
Consider the following statements for Nano-technology:
- aIt is the technology of creating materials and devices atom-by-atom.
- bPhysical properties change at the nanometre scale.
- cChemical properties change at the nanometre scale. Which of the above statements are correct?
General ScienceChemistry
- A(a) and (b) only
- B(a) and (c) only
- C(b) and (c) only
- DAll (a), (b) and (c)
Explanation
Nanotechnology is defined as building materials and devices atom-by-atom and molecule-by-molecule (a is correct), and at the 1–100 nm scale quantum and surface effects make both physical properties (melting point, conductivity, colour) and chemical properties (reactivity, catalysis) differ from the bulk material (b and c are correct). Hence all three — option (D).