Physical and Chemical Changes
Plastic was accidently invented when the inventor was trying to make
a cup for coffee
an artificial ivory of billiard balls
an artificial sword for martial arts training
his favourite dish
an artificial ivory of billiard balls
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The mixture of iron and sulphur is separated byA. filtration
B. magnet
C. distillation
D. evaporation
In liquids the force of attraction between particles is
A. weaker than gases
B. stronger than gases but weaker than solids
C. stronger than solids but weaker than gases
D. stronger than solids and gases
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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