Physical and Chemical Changes App Download | Class 7 Science Quiz PDF e-Book
Class 7 Science Cerification Guide: Practice Test 11 (Chapter 17)
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By heating the color of mixture of sulphur and iron which is yellow turns to
When gas is cooled down, it changes its state into liquid. This is called
Polythene was discovered in
The odour of ammonia is
Long chain of atom is linked by
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