Physical and Chemical Changes
The reactions of ‘exothermic’ are
condensation reactions
endothermic reactions
reversible reactions
substitution reactions
endothermic reactions
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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
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
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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