Coose the correct statements.
P: Nanoparticles are unstable when they react with oxygen.
Q: Nanotechnology is applied in the production of synthetic skin and implant surgery.
R: Nano particles are non-reactive in nature.

(a) What type of oxides are formed when non-metals react with oxygen ? Explain with an example.
(b) What is the nature of oxides are formed when metals combine with oxygen? Explain with the help of an example.

Some of the following statements are incorrect. Find the incorrect statements and correct them.

$\left(\mathrm{a}\right)$The property of metals by virtue of which they can be drawn into wires is called ductility.

$\left(\mathrm{b}\right)$ Metals are a good conductor of electricity but a poor conductor of heat.

$\left(\mathrm{c}\right)$ Articles made of metals produce a ringing sound when struck hard.

$\left(\mathrm{d}\right)$Oxides of non-metals and metals are acidic in nature.

$\left(\mathrm{e}\right)$ A less reactive metal replaces a more reactive metal from its salt solution in water.

It is said that plastics are non reactive to MOST of the materials. So with whom do they react?