Q4. Classify the following sets of nuclides as examples of either isotopes or isobars.
Give suitable reason to support your answer
[i] 40Ar, 40K, and 40Ca [ii] 12C, 13C, and 14C
Q5. Give reasons:
[a] List two properties of gold which make it most suitable for making ornaments
according to our need.
[b] Why electrical wires are coated with PVC (Poly Vinyl Chloride)?
[c] Why do we apply oil on iron tools kept in storage?
Q6. What would you observe when zinc granules are placed in copper sulphate solution?
Identify the type of reaction and write word equation for the reaction involved.
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Answer:
4Answer 12C, 13C, and 14C are isotopes because they all contain six protons.
(b) 40Ar, 40K, and 40Ca are isobars because they have the same mass number.
(c) 14C, 15N, and 16O can't be isotopes because they contain different numbers of protons. They can't be isobars because they have different mass number. They all contain eight neutrons, however, so they are examples of isotones.
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