TEST1
Click on the correct answer
1
Which of the following plastics has the highest tensile strength?
Polythene
Polystyrene
Nylon
Phenol-methanal
2
A plastic sample softens and chars on gentle heating. On strong heating, it is burnt, giving out white acidic fumes. The plastic may be
Polythene
Polystyrene
Nylon
PVC
3
Which of the following statements about thermosetting plastics is incorrect?
They are insoluble in any solvent
They react slowly with dilute sulphuric acid
Once set hard, they cannot be soften again
They do not burn in air
4
A plastic ash tray is usually formed by
1. compression moulding
2. extrustion
3. injection moulding
1 only
2 only
1 and 2
2 and 3
5
Which of the following is a natural polymer?
Diamond
Starch
PVC
Terylene
6
Which of the following is not a polymer?
Cellulose
Silk
Sucrose
PVC
7
Which of the following statements is true for both ethene and ethane?
Both have the same empirical formula
Both can burn in air
Both can be polymerized
Both are soluble in water
8
If bromine reacts with an organic compound X to form a single product Y, what conclusion can you make?
X is an alkene
Y is a saturated compound
Y is an unsaturated compound
X is an unsaturated compound
9
Poly(ethene) and ethene
have the same molecular formula
have different properties
belong to the same series
have unsaturated structures
10
Which of the following pairs of chemicals can give condensation polymers under suitable conditions?
1. Hexane-1,6-diamine and hexanedioyl dichloride
2. Urea and methanal
3. Phenol and methanal
1 and 2
1 and 3
2 and 3
all the options
11
Which of the following are condensation polymers?
1. PVC
2. Polyester
3. Poly(propene)
4. Phenol-methanal
1 and 2
2 and 3
2 and 4
1 and 4
12
Urea-methanal can be prepared from a solution of urea and methanal by adding a little
dilute sulphuric acid
concentrated sulphuric acid
dilute hydrochloric acid
concentrated hydrochloric acid
13
Which of the following statements about plastics is incorrect?
There are no cross-link between separate polymer chains in thermoplastics
A few plastics can conduct electricity in their molten state
There are cross-link between separate polymer chains in the thermosetting plastics after being set hard
Thermosetting plastic are rigid due to the cross-link
14
A rapid increase in the price of the petroleum probably would have the greatest impact on the cost of
rayon
nylon
silk
wood
15
1st statement: Alkene is an unsaturated hydrocarbon.
2nd statement: Combustion of alkene is an exothermic process.
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.
16
1st statement : Ethene is more active than ethane.
2nd statement: Ethene has a lower molecular mass than ethane.
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.