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. less reactive, with higher melting points and harder solids
- B. more reactive in every case
- C. non metallic in character
- D. monovalent in their compounds
Explanation: Group II atoms are smaller and must lose two electrons rather than one, so more energy is needed and they are less reactive than their…
Correct answer: less reactive, with higher melting points and harder solids- A. decreases down the group
- B. is the same for all
- C. increases down the group
- D. first increases then decreases
Explanation: A small, highly charged cation polarises the carbonate ion strongly and weakens the carbon to oxygen bonds, so magnesium carbonate…
Correct answer: increases down the group- A. Barium sulphate
- B. Magnesium hydroxide
- C. Calcium carbide
- D. Beryllium chloride
Explanation: Magnesium hydroxide, sold as milk of magnesia, is a weak insoluble base that neutralises excess stomach acid without being absorbed in…
Correct answer: Magnesium hydroxide- A. calcium oxide and hydrogen
- B. calcium hydride and oxygen
- C. calcium hydroxide and hydrogen
- D. calcium carbonate and hydrogen
Explanation: Calcium reacts steadily with cold water to give a suspension of slightly soluble calcium hydroxide, known as limewater when filtered…
Correct answer: calcium hydroxide and hydrogen- A. First ionisation energy
- B. Electronegativity
- C. Solubility of the hydroxides in water
- D. Melting point of the metal
Explanation: Hydroxide solubility rises down the group, so magnesium hydroxide is only sparingly soluble while barium hydroxide dissolves appreciably…
Correct answer: Solubility of the hydroxides in water- A. Chlorine
- B. Silver nitrate
- C. Copper Sulfate
- D. Nitric acid
Explanation: Copper sulfate is mixed with milk of lime to form Bordeaux mixture, which is used as a fungicide against fungi and moulds.
Correct answer: Copper Sulfate- A. White
- B. Brown
- C. Blue
- D. Green
Explanation: Crystalline copper sulfate is commonly encountered as hydrated copper sulfate, CuSO4·5H2O, whose crystals are bright blue because of the…
Correct answer: Blue- A. AgNO3
- B. CuSO4.5H2O
- C. K2Cr2O7
- D. K2CrO4
Explanation: Blue vitriol or blue stone is hydrated copper(II) sulfate, CuSO4.5H2O, whose water of crystallisation gives it a bright blue colour.
Correct answer: CuSO4.5H2O- A. CuSO3.4H2O
- B. CuSO4.4H2O
- C. CuSO3.5H2O
- D. CuSO4.5H2O
Explanation: The common crystalline form called copper sulfate is CuSO4.5H2O, containing five water molecules of crystallisation and appearing blue.
Correct answer: CuSO4.5H2O10. A brivalent metal has the equivalent weighr of 12. The molecular weight to its oxide will be_______?
- A. 24
- B. 32
- C. 36
- D. 40
Explanation: For a bivalent metal, equivalent weight = atomic weight ÷ 2, so its atomic weight is 12 × 2 = 24.
Correct answer: 40- A. Ortho burate
- B. Meta borate
- C. Double oxide
- D. Tetra borate
Explanation: On heating, borax forms sodium metaborate, NaBO2, and boric anhydride, B2O3; in the bead test, the oxide then combines with a metal oxide…
Correct answer: Meta borate- A. Ca and P
- B. S and P
- C. Ca and S
- D. we could not apply
Explanation: Gypsum is calcium sulfate dihydrate, CaSO4.2H2O, so it supplies calcium and sulfur to soil.
Correct answer: Ca and S- A. Na2CO3
- B. K2CO3
- C. (NH4)2CO3
- D. CaCO3
Explanation: Most carbonates are insoluble in water, except those of Group I metals and ammonium.
Correct answer: CaCO3- A. Sodium sulphate
- B. Potassium sulphate
- C. Zinc sulphate
- D. Barium sulphate
Explanation: Barium sulfate is highly insoluble because its crystal lattice is very stable and hydration does not compensate sufficiently for the…
Correct answer: Barium sulphate- A. Si
- B. Ba
- C. Mg
- D. Ca
Explanation: Calcium is needed for normal plant growth and helps maintain the development of leaves and growing tissues.
Correct answer: Ca- A. KCI
- B. KCI.MgCl2.6H2O
- C. Na2B4O7.10H2O
- D. CaCO3.MgCO3
Explanation: Carnallite is a hydrated double chloride with the formula KCl.MgCl2.6H2O.
Correct answer: KCI.MgCl2.6H2O- A. Acidic
- B. Basic
- C. Amphoteric
- D. Neutral
Explanation: BeO reacts with both acids and strong bases, so it is amphoteric: it forms beryllium salts with acids and beryllates in alkaline solution.
Correct answer: Amphoteric- A. O-2
- B. H+
- C. Cl-
- D. Na+
Explanation: The oxide ion, O-2, cannot remain in aqueous solution because it reacts immediately with water: O-2 + H2O forms OH- ions.
Correct answer: O-2- A. CaSiO3
- B. Na2SiO3
- C. Ca3(PO4)2
- D. MnSiO3
Explanation: Calcium phosphate, Ca3(PO4)2, is a source of phosphorus and is used as a phosphate fertiliser.
Correct answer: Ca3(PO4)2- A. SiO2
- B. Fe2O3
- C. FeO
- D. CaO MgO
Explanation: Phosphorus and sulfur are acidic impurities, so the open-hearth furnace is lined with basic refractory materials such as CaO and MgO…
Correct answer: CaO MgOReactions of Group II Elements MCQs: common questions
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