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1. The total number of cations precipitated during the reaction is 1, which is Cu2+, as Al3+ and Fe3+ sulphides hydrolyse in water, Ni2+ and Zn2+ require a basic medium with H2S to form a precipitate, and Ca2+ and Ba2+ sulphides are soluble.

2. The set of elements that can be detected using sodium fusion extract is Sulfur, Nitrogen, Phosphorous, and Halogens.

3. The correct order of first ionisation enthalpy is Al < Mg < S < P.

4. The value of "Y" in the given reaction is –CHO, which is an aldehyde.

5. Both statements I and II are true, as [Mn(CN)6]3–, [Fe(CN)6]3–, and [Co(C2O4)3]3– are d2sp3 hybridised, and [MnCl6]3– and [FeF6]3– are paramagnetic and have 4 and 5 unpaired electrons, respectively.

6. Statement I is correct, but statement II is false, as hyperconjugation is a permanent effect, but it involves the overlapping of a 1s orbital of hydrogen with an empty 2p orbital of carbon, not the other way around.

7. The addition of silica during the extraction of copper from its sulphide ore converts iron oxide into iron silicate.

8. The correct sequence of reagents for the given transformation is (i) Cl2, FeCl3, (ii) Fe, HCl, (iii) NaNO2, HCl, 0°C, and (iv) H2O/H+.

9. The number of neutrons and electrons present in the radioactive isotope of hydrogen (Tritium) is 2 and 1, respectively.