HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Attempt the following:

Explain the vulcanisation of rubber. Which vulcanizing agents are used for the following synthetic rubber?
a. Neoprene
b. Buna-N

Define the following term:

Nanoscience

Answer the following

Define the following term: Nanotechnology

Answer the following

Define the following term: Nanomaterial

Define the Nanochemistry.

Write the reaction involved in the formation of bakelite.

Answer the following

Which nanomaterial is used in sunscreen lotion? Write its use.

Attempt the following:

What is meant by LDP and HDP? Mention the basic difference between the same with suitable examples.

Write preparation, properties, and uses of Teflon.

Answer the following.

Is synthetic rubber better than natural rubber? If so, in what respect?

Answer the following.

Write main specialities of Buna-S, Neoprene rubber?

Write the structure of isoprene and the polymer obtained from it.

Explain optical isomerism in 2-chlorobutane.

For the isomeric dihalobenzenes, melting point of __________

Optical activity of a molecule is associated with _______________

Write the relationship between radius of atom and edge length of fcc unit cell.

Explain optical activity of 2-chlorobutane.

Give the percentage of empty space in bcc lattice.

If the total volume of a simple cubic unit cell is 6.817 × 10^-23 cm³, what is the volume occupied by particles in the unit cell?

Find the number of atoms in the fcc unit cell.