Physical and Chemical Changes
In liquids the force of attraction between particles is
weaker than gases
stronger than gases but weaker than solids
stronger than solids but weaker than gases
stronger than solids and gases
stronger than gases but weaker than solids
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Plastic was accidently invented when the inventor was trying to makeA. a cup for coffee
B. an artificial ivory of billiard balls
C. an artificial sword for martial arts training
D. his favourite dish
The mixture of iron and sulphur is separated by
A. filtration
B. magnet
C. distillation
D. evaporation
Number of atoms in one molecule of ethene is
A. 2
B. 3
C. 4
D. 6
The color of solid iron is
A. green
B. brown
C. grey
D. black
The reactions of ‘exothermic’ are
A. condensation reactions
B. endothermic reactions
C. reversible reactions
D. substitution reactions
In chemical reactions, energy is absorbed or released in the form of
A. sound
B. light
C. electricity
D. heat
At first slightly different form of ‘polythene’ was discovered in
A. 1733
B. 1833
C. 1933
D. 1953
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