Which statement from following about nanomaterial is NOT correct?

Which statement from following about nanomaterial is NOT correct?
  1. As the particle size decreases the total surface area of particles increases
  2. Nanomaterial based catalysts exhibit increased catalytic activities
  3. Nanosized $\mathrm{Cu}$ and $\mathrm{Pd}$ clusters have very less hardness than bulk metal
  4. Carbon nanotube can act as electrical conductor

Solution

Nanosized copper and palladium clusters with diameter in the size range of 5-7 nm can have hardness upto $500 \%$ greater than bulk metal.

Asked in: MHT CET 2023 (13 May Shift 2)

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