TEST3
Click on the correct answer
1
The formula below can be used to represent the structure of some polymers.
H X
| |
- C - C-
| |
H H
(X represents an atom or a group of atoms.)
Which of the following combinations is INCORRECT ?
X Name of polymer
H polythene
Cl polyvinyl chloride
CH
3
perspex
C
6
H
5
polystyrene
2
Which of the following statements concerning urea methanal is/are correct ?
1. It softens on gentle heating.
2. It can be used to make ash trays.
3. It consists of polymer chains with cross-linkages between the chains.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
3
Which of the following statements concerning the recycling of plastics are correct ?
1. The recycling of plastics can help to solve the disposal problem of plastics.
2. The recycling of plastics can save raw materials derived from petroleum.
3. It is difficult to separate different types of plastics in the recycling process.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3) only
4
1st statement : Nylon softens on heating.
2nd statement: Nylon is a condensation polymer.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
5
When concentrated sulphuric acid is added dropwise to a solution containing urea and methanal in test tube with shaking, a white solid can be formed. Which of the following statements about this experiment is/are correct ?
(1) The reaction involved is condensation polymerization.
(2) Concentrated sulphuric acid acts as an oxidizing agent.
(3) The white solid is a thermoplastic substance.
(1) only
(3) only
(1) and (2) only
(2) and (3) only
6
1st statement : When nylon is heated, an alkaline gas is given off.
2nd statement: In the nylon molecule, nitrogen and hydrogen atoms are in a ratio of 1 : 3.
Both statements are true but the 2nd one is not a correct explanation of the 1st one.
Only one statement is true while the other is false.
Both statements are true and the 2nd one is a correct explanation of the 1st one.
Both statements are false.
7
Which of the following statements concerning nylon is correct ?
It is an addition polymer.
It melts in boiling water.
It has low tensile strength.
The intermolecular forces between the polymer chains are stronger than that in polythene
8
Which one of the following statements concerning polystyrene is INCORRECT ?
Polystyrene is an electrical insulator.
Polystyrene can be used as a heat insulator.
Expanded polystyrene is widely used as a packaging material.
Polystyrene is incombustible.
9
Ethanol and propanoic acid are heated together as shown in the diagram. The main purpose of using the condenser is to
prevent ethanol from catching fire.
prevent loss of the reactants.
purify the product.
separate ethanol form propanoic acid.
10
Which of the following polymers is/are made by condensation polymerization ?
(1) only
(3) only
(1) and (2) only
(2) and (3) only