Q7 of 0620_w24_qp_23

Question 7

Question 7 of 40

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No letter options?

Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.

A 1, 2 and 3 are correct

B 1 and 2 only are correct

C 2 and 3 only are correct

D 1 only is correct

Topics Tested

9. Metals

9.6. Extraction of metals

State the symbol equations for the extraction of iron from hematite (a) ( C + O_2 ightarrow CO_2 ) (b) ( C + CO_2 ightarrow 2CO ) (c) ( Fe_2O_3 + 3CO ightarrow 2Fe + 3CO_2 ) (d) ( CaCO_3 ightarrow CaO + CO_2 ) (e) ( CaO + SiO_2 ightarrow CaSiO_3 )

3. Stoichiometry

3.1. Formulae

Deduce the formula of an ionic compound from the relative numbers of the ions present in a model or a diagrammatic representation or from the charges on the ions

12. Experimental techniqu...

12.5. Identification of ions and ga...

Describe tests using aqueous sodium hydroxide and aqueous ammonia to identify the aqueous cations: (a) aluminium, ( Al^{3+} ) (b) ammonium, ( NH_4^+ ) (c) calcium, ( Ca^{2+} ) (d) chromium(III), ( Cr^{3+} ) (e) copper(II), ( Cu^{2+} ) (f) iron(II), ( Fe^{2+} ) (g) iron(III), ( Fe^{3+} ) (h) zinc, ( Zn^{2+} )