Separate samples of magnesium and calcium are added to an excess of dilute sulfuric acid. The observations are summarised in the table. Which statement explains the difference in these observations?
A.
Calcium is a better oxidising agent than magnesium.
B.
Calcium is a better reducing agent than magnesium.
C.
Magnesium is a more reactive metal with all dilute acids than calcium.
D.
Magnesium sulfate is more soluble than calcium sulfate.
Exam No：9701_m24_qp_12 Year：2024 Question No：19
Answer:
D
Knowledge points:
3.4.1.1.1 hydrogen,
3.4.1.1.10 ethene,
3.4.1.1.2 oxygen,
3.4.1.1.3 nitrogen,
3.4.1.1.4 chlorine
3.4.1.1.5 hydrogen chloride, HCl
3.4.1.1.6 carbon dioxide,
3.4.1.1.7 ammonia,
3.4.1.1.8 methane,
3.4.1.1.9 ethane,
3.4.1.2 understand that elements in period 3 can expand their octet including in the compounds sulfur dioxide, , phosphorus pentachloride, , and sulfur hexafluoride,
3.4.1.3 describe coordinate (dative covalent) bonding, including in the reaction between ammonia and hydrogen chloride gases to form the ammonium ion, , and in the molecule
3.4.2.1.1 $\sigma $ bonds are formed by direct overlap of orbitals between the bonding atoms
3.4.2.1.2 π bonds are formed by the sideways overlap of adjacent p orbitals above and below the σ bond
3.4.2.2 describe how the σ and π bonds form in molecules including
3.4.2.3 use the concept of hybridisation to describe sp, $\mathrm{sp}^{2}$ and $\mathrm{sp}^{3}$ orbitals
3.4.3.1.1 bond energy as the energy required to break one mole of a particular covalent bond in the gaseous state
3.4.3.1.2 bond length as the internuclear distance of two covalently bonded atoms
3.4.3.2 use bond energy values and the concept of bond length to compare the reactivity of covalent molecules
Solution:
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