Free Reactions of Group II Elements MCQs with Answers
56 Reactions of Group II Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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- A. FeS2
- B. HgS
- C. PbS
- D. ZnS
Explanation: Cinnabar is the naturally occurring red form of mercury(II) sulfide, HgS.
Correct answer: HgS- A. KCI
- B. NaCI
- C. KCI MgCl2 6H2O
- D. Na2CO3. 10H2O
Explanation: Carnallite is the hydrated double salt KCl.MgCl2.6H2O, formed naturally in evaporite deposits.
Correct answer: KCI MgCl2 6H2O- A. Be+2H2O?Be (OH)2+H2
- B. Be+H2O?Be (OH)2+H2
- C. Be+H2O?[Be (OH)4]+2+H2
- D. no reaction
Explanation: Beryllium does not normally react with water because a compact protective layer of beryllium oxide forms on its surface.
Correct answer: no reaction- A. Ca+2 and SO42-
- B. Ca2+ and Mg2+
- C. SO42- and Cl-
- D. HCO3- and SO42-
Explanation: Hard water contains an excess of Ca2+ and/or Mg2+ ions, which form insoluble salts with soap, causing scum to form.
Correct answer: Ca2+ and Mg2+- A. Sr(OH)2
- B. Mg(OH)2
- C. Ba(OH)2
- D. Ca(OH)2
Explanation: The solubility of alkaline earth metal hydroxides in water increases down the group. Be(OH)2 is quite insoluble.
Correct answer: Ca(OH)2- A. Na2SO4
- B. BaCO3
- C. Mg(NO3)2
- D. CaSO4
Explanation: Alkaline earth metal nitrates, such as magnesium nitrate (Mg(NO3)2), calcium nitrate (Ca(NO2)2), and barium nitrate (Ba(NO3)2), decompose…
Correct answer: Mg(NO3)2- A. Be
- B. Mg
- C. Ca
- D. Sr
Explanation: Beryllium is the only alkaline earth metal that releases hydrogen gas (H2) when reacted with alkalies (strong bases like sodium hydroxide…
Correct answer: Be- A. Ca(OH)2
- B. Mg(OH)2
- C. Be(OH)2
- D. Sr(OH)2
Explanation: Beryllium hydroxide is the least soluble among the group II hydroxides. It is only slightly soluble in water.
Correct answer: Be(OH)2- A. Forms a sparingly soluble sulfate
- B. Forms a soluble sulfate
- C. Forms a highly reactive sulfate
- D. Forms a volatile sulfate
Explanation: This is the correct answer. Strontium, like calcium and barium, is a Group 2A element (alkaline earth metal).
Correct answer: Forms a sparingly soluble sulfate- A. Be > Ca > Mg
- B. Ca>Be>Mg
- C. Mg > Be > Ca
- D. Be>Mg> Ca
Explanation: The correct order of melting points for group IIA elements is Be > Ca > Mg.
Correct answer: Be > Ca > Mg- A. Be
- B. Mg
- C. None of these
- D. Ba
Explanation: The correct answer is Beryllium (Be). Beryllium does not react with water even at red hot temperature due to the formation of a protective…
Correct answer: Be- A. Na (Sodium)
- B. K (Potassium)
- C. Mg (Magnesium)
- D. Ca (Calcium)
Explanation: Magnesium (Mg) is considered a 'good' metal because it is lightweight, strong, and ductile, making it suitable for various industrial…
Correct answer: Mg (Magnesium)- A. Decrease
- B. Increase
- C. Constant
- D. Variable
Explanation: The solubility of IIA elements' hydroxides increases as you move down the group.
Correct answer: Increase- A. Charge on ion
- B. Size of metal
- C. Charge/size
- D. A and C
Explanation: Basicity is the ability of a substance to accept a proton. This ability is inversely proportional to the charge on an ion and the…
Correct answer: A and C35. When a metal carbonate is heated at 100°C, which of the following compounds will readily decompose?
- A. BaCO₃
- B. MgCO₃
- C. BeCO₃
- D. SrCO₃
Explanation: The thermal stability of metal carbonates increases down a group in the periodic table because the larger cations (lower down the group)…
Correct answer: BeCO₃- A. MgO and NO2
- B. Mg and NO2
- C. MgO, NO2, O2
- D. Mg(NO3)2
Explanation: The thermal decomposition of nitrates of group 2 produces metal oxide, nitrogen dioxide and oxygen.
Correct answer: MgO, NO2, O2- A. CO2
- B. Magnesium and Copper
- C. N2O
- D. N2 as well as CO2
Explanation: When burning magnesium is placed in carbon dioxide it keeps burning with a bright flame.
Correct answer: CO2- A. All nitrates of Group II metals are decomposed by heat to give the oxide NO2
- B. Aqueous sodium nitrate in acidic to litmus
- C. Aqueous ammonium nitrate is alkaline to litmus
- D. The alkali metal nitrates are insoluble in water
- E. Metals dissolve in concentrated nitric acid to give hydrogen
Explanation: All group II and group I metals decompose to produce NO2 as the gas, so statement A stands correct.
Correct answer: All nitrates of Group II metals are decomposed by heat to give the oxide NO2- A. The magnitude of the enthalpy change of hydration of the metal ion
- B. The pH of the aqueous chloride
- C. The solubility of the sulphate in water
- D. The stability of the carbonate to heat
- E. The tendency to form complex ions
Explanation: The stability of metal carbonates increases down the group, so D is the correct option.
Correct answer: The stability of the carbonate to heat- A. NH3
- B. H2
- C. N2
- D. NO
Explanation: When alkaline earth metal nitride reacts with water, ammonia (NH3) is produced.
Correct answer: NH3