Select the odd one out giving reasons:
1. Cutting of nails, breaking of glass, formation of iron sulphide. Reason:
2. Permanent change, reversible change, composition. Reason:
3. Alloying, galvanization, crystallisation. Reason:
4. Burning of coal, burning of magnesium, burning of hydrogen. Reason:
(Hint: Coal and magnesium are solids, hydrogen is a gas)
Very short-answer questions:
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a. formation of sulphide because it is a chemical change.
b. Reversible change is a temporary change
c. galvanization is method of applying a protective zinc coating to steel or iron.
d. Hydrogen which is gas whereas magnesium and coal are solids. Hence burning of hydrogen is odd one out.
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