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The question is about answering a chemistry exam paper for a class, which includes various multiple-choice questions on topics such as valency, chemical reactions, and formulas.

Answer

["(i) +3","(ii) CaCO\u2083","(iii) NO\u2082","(iv) Fe","(v) c","(vi) KNO\u2083","(vii) 4","(viii) N\u2082O","(ix) Iodine","(x) Nitrogen","(xi) Dirty green"]

["1. (i) Answer: +3 (Aluminium in aluminium nitride, AlN)","1. (ii) Answer: CaCO\u2083 (The metallic carbonate stable to heat)","1. (iii) Answer: NO\u2082 (Gas evolved during heating of KNO\u2083)","1. (iv) Answer: Fe (Metal with variable valency)","1. (v) Answer: c (Circled dot represents Nitrogen)","1. (vi) Answer: KNO\u2083 (Salt giving reddish brown fumes on thermal decomposition)","1. (vii) Answer: 4 (Number of oxygen atoms in acetic acid, C\u2082H\u2084O\u2082)","1. (viii) Answer: N\u2082O (Chemical formula of Dinitrogen oxide)","1. (ix) Answer: Iodine (Substance subliming on heating)","1. (x) Answer: Nitrogen (Gas evolved by active metals with dilute sulphuric acid)","1. (xi) Answer: Dirty green (Colour of Iron [II] Hydroxide)"]

More Information

This sheet covers a range of chemistry topics including valency, reaction gases, and properties of metals. Avoiding mistakes often requires revisiting textbook sections corresponding to each question.

Tips

Common mistakes include misunderstanding the chemical formulae or valencies of elements. Review formulae and valencies carefully to avoid simple errors.

Sources

Paper Homework Help & Answers - Studypool - studypool.com

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