Which of the following statements are correct in the case of nanomaterials1. They have a large surface area2. They have large imperfections compared to their counter parts3. They are used in Fuel Cells4. They have large fraction of surface atoms*1 point1, 2, 4 are correct1, 2, 3 are correct2, 3, 4 are correct

Nanomaterials have large fraction of surface atoms.

What is the standard form for 1 nanometre?1 × 10-8 m0.1 × 10-8 m0.1 × 10-9 m1 × 10-9 m2What size are nanoparticles?100-1000 nmMore than 1000 nmLess than 1 nm1-100 nm3Why are only very small amounts of nanoparticles required in industry compared with other molecules?Because they are unreactiveBecause they have a very large surface area to volume ratioBecause they have a very small surface area to volume ratioBecause they are highly flammable4Why do some people have concerns about the use of nanoparticles in sunscreens?They are flammableThey may not be very effectiveThey may enter the bloodstream with unpredictable resultsThey are very expensive

Which of the following statements about carbon nanotubes is true?Question 2Answera.They are primarily used in bulk manufacturing of composites. b.They have poor electrical conductivity. c.The structure resembles to graphene sheets rolled into a cylindrical shape.d.They are not suitable for biomedical applications. e.They are two-dimensional materials.

Which statements are correct about a group? Select all that apply.Each member of the group has the identical electron configuration in the outer shell.The elements in each group have similar chemical properties.The elements in each group have identical physical properties.The atomic number of each element increases by 7 down through the group.

Which of the following statement(s) is (are) not correct? Check all that apply.Select one or more:a.VSEPR theory helps to predict molecular shapes in three-dimensional space.b.If the central atom of a molecule is in Group 14 (group of carbon) of periodic table, the molecular geometry must be tetrahedral.c.The molecular shapes of NF3 and BF3 are the same.d.Electron geometry of ammonia (NH3) is the same as that of water (H2O)