Reactions of Group II Elements

Reactions of Group II Elements MDCAT MCQs with answers

17 past paper MCQs on Reactions of Group II Elements, from the s- and p-Block Elements unit of MDCAT Chemistry. The year each question appeared is shown where known; tap “Show answer” for the correct option and a short solution.

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1.Which of the following sulphates is insoluble in water? (MDCAT 2022)

  1. $\mathrm{BeSO_4}$
  2. $\mathrm{BaSO_4}$
  3. $\mathrm{MgSO_4}$
  4. $\mathrm{CaSO_4}$
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Correct answer: (b) $\mathrm{BaSO_4}$

Solubility of the group II sulphates falls down the group, and barium sulphate is insoluble.

2.Which one of these oxides is amphoteric in nature? (MDCAT 2023)

  1. lithium oxide
  2. beryllium oxide
  3. calcium oxide
  4. potassium oxide
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Correct answer: (b) beryllium oxide

Beryllium oxide reacts both with acids and with alkalis; the other three are basic.

3.The solubility of the sulphates of the alkaline earth metals generally: (MDCAT 2024)

  1. increases down the group
  2. decreases down the group
  3. increases then decreases down the group
  4. does not change down the group
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Correct answer: (b) decreases down the group

The lattice energy falls more slowly than the hydration energy down the group, so the sulphates become less soluble.

4.Which of the following best explains the reaction between Beryllium (Be) and Oxygen (O)? (KMU MDCAT 2025)

  1. Be burns vigorously with oxygen forming a layer of BeO, which accelerates the oxidation of remaining metal
  2. Be reacts with oxygen forming a layer of BeO, which protects the metal from further oxidation
  3. Be reacts slowly with oxygen to form a volatile oxide BeO, which evaporates quickly
  4. Be is the only alkaline earth metal that doesn't react with oxygen
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Correct answer: (b) Be reacts with oxygen forming a layer of BeO, which protects the metal from further oxidation

The oxide film that forms on beryllium sticks to the metal and seals it from further attack.

5.The solubility of sulphates of alkaline metals generally (UHS MDCAT 2024)

  1. Increase down the group
  2. Decrease down the group
  3. Increase then decrease down the group
  4. Doesn't change down the group
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Correct answer: (b) Decrease down the group

The lattice energy falls more slowly than the hydration energy down group II, so the sulphates get less soluble.

6.When a metal carbonate is heated at 100°C, which will readily decompose? (NUMS MDCAT 2024)

  1. BaCO3
  2. MgCO3
  3. BeCO3
  4. SrCO3
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Correct answer: (c) BeCO3

Thermal stability of the carbonates rises down the group, so the beryllium salt goes first.

7.Q.98 Which of the following sulfate compound is insoluble in water ? (UHS MDCAT 2023)

  1. BeSO4
  2. BaSO4
  3. MgSO4
  4. CaSO4
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Correct answer: (b) BaSO4

Solubility of the group II sulphates falls down the group, and barium sulphate is insoluble.

8.Which one of them is amphoteric in nature? (UHS MDCAT 2023)

  1. Lithium oxide
  2. Beryllium oxide
  3. Calcium oxide
  4. Potassium oxide
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Correct answer: (b) Beryllium oxide

Beryllium oxide dissolves in both acid and alkali, so it is amphoteric.

9.All alkaline earth metals react with nitrogen to give: (PMC MDCAT 2022)

  1. Nitrates
  2. Nitrides
  3. Nitriles
  4. Amides
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Correct answer: (b) Nitrides

Heated in nitrogen, the group II metals form nitrides of formula $\mathrm{M_3N_2}$.

10.When magnesium nitride (Mg3 N2 ) reacts with with water the reaction mixture becomes: (PMC MDCAT 2022)

  1. Acidic
  2. Basic
  3. Neutral
  4. Amphoteric
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Correct answer: (b) Basic

The nitride hydrolyses to magnesium hydroxide and ammonia, both of them alkaline.

11.Which of the following does not react with water even at red hot temperature. (PMC MDCAT 2022)

  1. BeO
  2. MgO
  3. CaO
  4. BaO
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Correct answer: (a) BeO

Beryllium oxide is covalent and inert; the oxides below it in the group give hydroxides with water.

12.Which one of the following is more soluble in water? (PMC MDCAT 2022)

  1. Be{OH)2
  2. Ca(OH)2
  3. Mg(OH)2
  4. Ba(OH)2
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Correct answer: (d) Ba(OH)2

Solubility of the group II hydroxides rises down the group, so barium hydroxide is the most soluble.

13.Among alkaline earth metals the one which shows the least chemical reactivity Is: (PMC MDCAT 2022)

  1. Be
  2. Ca
  3. Mg
  4. Ba
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Correct answer: (a) Be

Beryllium is the smallest of the group and its compounds are largely covalent, so it reacts least readily.

14.The solubility of alkaline earth metal: (NUMS MDCAT 2022)

  1. Decreases down the group
  2. Increases down the group
  3. Remains constant throughout the group
  4. First increases then decreases down the group
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Correct answer: (b) Increases down the group

The hydroxides grow more soluble down group II as the lattice energy falls faster than the hydration energy.

15.Magnesium reacts with nitrogen to form: (PMC MDCAT 2020)

  1. Mg2N2
  2. Mg3N2
  3. MgN2
  4. MgN
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Correct answer: (b) Mg3N2

Magnesium burns in nitrogen to $\mathrm{Mg_3N_2}$.

16.Down the group acid-base behaviour of metallic oxides of group 2 elements changes to: (UHS MDCAT 2018)

  1. More basic
  2. No change
  3. Less basic
  4. More acidic
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Correct answer: (a) More basic

The oxides grow more basic down the group as the metals grow more electropositive.

17.Melting points of group II-A elements are higher than those of group I-A because: (UHS MDCAT 2016)

  1. Atoms of II-A elements have smaller size
  2. II-A elements are more reactive
  3. Atoms of II-A elements provide two binding electrons
  4. I-A elements have smaller atomic radius
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Correct answer: (c) Atoms of II-A elements provide two binding electrons

Each group II atom contributes two electrons to the metallic bond instead of one.

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