Elastomer

Q. Arrange the following in the increasing order of intermolecular forces

1. Thermoplastic
2. Thermosetting
3. Fiber
4. Elastomers

Q. Which of the following is not an elastomer?

1. Buna-S
2. Buna-N
3. PVC
4. Neoprene

Q. Difference between absorbate and adsorbant

Q. 15.Value of vant hoff factor for H3PO3 & H3PO4

Q. Which is most reactive nucleophile in polar aprotic solvent? (1)F^- (2)Cl^- (3)Br^- (4)I^-

Q. which shell would be the first to have g subshell

Q. why (sih3)3P SHOWS NO backbonding

Q.

Why are rubber called elastomers ?

Q. what is the difference between nucleophile and base ? which among oH^- and SH^- is better nuleophile or base ?

Q. What is neutral FeCl3

Q. What is an elastomer?

1. Elastomers are hard, brittle polymers with cross-links
2. Elastomers are rubber-like solids with weak intermolecular forces.
3. Elastomers are stretchable solids with strong intermolecular forces.
4. Elastomers are hard, brittle solids with strong intermolecular forces

Q. What is the mechanism of reaction of propene with HOCl?

Q.

Give an example of the weakest inter-particle forces.

Q. The weakest interparticle forces are present in:

1. Thermosetting polymers
2. Thermoplastic polymers
3. Fibres
4. Elastomers

Q. what are the structures of: 1)wood spirit 2)tetrahydrofurane

Q. In CCP type structure if half of face centre atoms are removed then % void in unit cell is

Q. what is first order kinetics?

Q. What is de-brogeli experiment?

Q. In elastomer, intermolecular forces are:

1. Strong
2. Weak
3. Nil
4. None of these

Q. Assertion
Neoprene can be further hardened by heating in presence of sulphur.
Reason
Neoprene contains allylic double bonds which help in introducing sulphur bridges between different polymer chains.
Neoprene can be further hardened by heating in presence of sulphur.

1. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.

Q. What is the difference between isobutyl and secbutyl.

Q. how does gypsum differs from hydrated copper sulphate

Q. Chain growth addition polymerization is an important reaction of:

1. alkenes
2. conjugated dienes
3. polyamides
4. polyesters

Q. Pottassium crystallizes in a bcc lattice.how many unit cell are present in the 2g k

Q. Sodium crystallises in body-centred cubic lattice structure has edge length of unit cell 400 pm. The density (in g cm) will be

Q. In elastomer, intermolecular forces are

1. Very strong
2. Nil
3. Weak
4. Strong

Q. What is alkenynes?

Q. How molecular wgt differ from eqvlnt wgt?

Q. Which of the following is an elastomer?

1. Bakelite
2. Nylon-6
3. Vulcanized rubber
4. Natural rubber

Q. In elastomer, intermolecular forces are

1. Nil
2. Weak
3. Strong
4. Very strong