GROUP 2 ELEMENTS [ALKALINE EARTH METALS]
GROUP 2 ELEMENTS [ALKALINE EARTH METALS]
Total Questions: 70
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1. Which of these shows the correct trend for the solubility of the hydroxides of group 2 metals?
Solubility of OH- increases down the group
2. Which of these shows the correct trend for the solubility of sulphates of group 2 metals?
Solubility of SO42- decreases down the group
3. Which of these is the least soluble hydroxide?
Mg(OH)2
4. Barium sulphate is used in medicine whereas other solutions containing Barium ions are poisonous. Which of these properties makes barium sulphate to stand out?
Its insolubility
5. Which alkaline earth metal has the least melting point?
Mg
6. Which of the following alkaline earth metal carbonates is the most thermally stable?
BaCO3
7. Which of these compounds of Beryllium is known to be soluble in water?
BeSO4
8. One of these alkaline earth metals does not give colour to flame
Mg
9. One of these alkaline earth metals forms many covalent compounds with non-metals
Be
10. Which of the following alkaline earth metals is usually used as a reducing agent during the extraction of titanium?
Mg
11. Alkaline earth metals have higher reducing power than alkali metals.
False
12. Which of these hydroxides is the most soluble in water?
Ba(OH)2
13. One of these would only react with water at red heat
Mg
14. The oxide of which of these alkaline metals is known to be amphoteric
Be
15. Which of these elements would form passivation layer on exposure to air?
Be
16. Alkaline earth metals usually have bigger ionic radii than the alkali metals in their respective groups
False
17. _ gives brick red colour to flame when heated?
Ca
18. Which of these alkaline earth metals would not react with Nitrogen?
None of the above options
19. All chlorides of alkaline earth metals are soluble in water
True
20. The nitrates of alkaline earth metals decompose on heating to give metal oxide and...
Nitrogen(IV)oxide and Oxygen
21. Which of these nitrates is the least thermally stable?
Mg(NO3)2
22. A compound, MgX, was heated, where X is an unknown anion of the compound. On passing the products of the heated compound through lime water, lime water turned milky. It can be deduced that X anion could be...
CO32-
23. Temporary hard water contain _ of divalent cations
Carbonates
24. Permanent hard water contain _ of divalent cations
Sulphates
25. One of these alkaline earth metals does not react directly with carbon?
Be
26. Beryllium compounds have coordination number of...
4
27. Dilute solutions of dissolved alkaline earth metals in ammonia is _ coloured
Blue
28. The alkaline earth metal that has the highest melting and boiling points in the group is...
Be
29. Be displays diagonal relationship with which of these elements?
Al
30. BeCl2 is a covalent chain polymer, existing as dimers when it is in...
Vapour phase
31. Which of these oxides is the most thermally stable?
BeO
32. One of these is not amphoteric
BeSO4
33. Beryllium would burn in oxygen (beyond its passivation layer) when heated to atleast
600°C
34. Magnesium hydroxide is very soluble in water
False
35. One of these alkaline earth metals is found in the chlorophyll of plants?
Mg
36. Calcium compounds are usually more extensively hydrated than magnesium compounds
True
37. _ is an important component in the bone mineral of animals
Ca
38. Which of these carbonates is used as a flux to remove impurities during the extraction of iron from its ore?
CaCO3
39. Strontium halides are usually covalent compounds
False
40. Strontium hydroxide dissolves very well in water, than calcium hydroxide
True
41. You enter a room and the scientist there tells you that, he just got a Strontium nitride solid by reacting Strontium with nitrogen. You look around and found no heating equipment. What will be your first conclusion within the next 20 seconds
The reaction is untrue
42. _ salts are used in fireworks to give crimson red colour
Sr
43. Why is Barium oxide usually reduced with aluminium during extraction, and not with carbon?
Ba forms carbide with carbon
44. Barium burns with _ coloured flame when heated in a hot Bunsen burner
Apple green
45. What happens when lattice energy is more than hydration enthalpy?
The compound does not dissolve
46. What happens when hydration energy is more than lattice energy?
The compound dissolves
47. Which of the following order is correct with respect to the hydration enthalpy of group 2 elements?
Be2+ > Mg2+ > Ca2+ > Sr2+ > Ba2+
48. Powdered Beryllium burns in air to give...
Beryllium oxide and Beryllium nitride
49. Which of the following is the best way to prepare BeF2?
Thermal decomposition of (NH4)2BeF4
50. Beryllium hydride can be prepared by directly heating Beryllium in excess hydrogen
No
51. The reducing power of alkaline earth metals is _ alkali metals
Less than
52. Which of the following is a compound of milk of magnesia, which is used as an antacid in order to treat acidity
Magnesium hydroxide
53. Magnesium does not form an alloy with one of these elements
Barium
54. Which of these alkaline earth metals does not have a naturally occurring isotope?
Both Strontium and Magnesium
55. Which would you expect to have the highest melting point?
MgO
56. Mortar is a mixture of...
Slaked lime, sand and water
57. Which of these is false about bleaching powder?
Highly soluble in water
58. Bleaching powder is a compound having the molecular formula...
CaOCl2
59. Which of the following alkaline earth metals shows some properties similar to aluminium?
Be
60. Which of the following substances is used as a dehydrating agent in the laboratory?
Calcium chloride
61. Which of these statements is incorrect about Beryllium?
It is easily attacked by water
62. Magnesium hardly reacts with...
Cold water
63. A metal X readily forms its sulphate, XSO4, which is water-soluble. It forms its oxide XO which becomes inert on heating. It forms its insoluble hydroxide X(OH)2 which is soluble in NaOH and HCl solutions. Then X is...
Be
64. Which of these is usually used to reduce the acidity of soil?
Calcium hydroxide
65. Mg burns in CO to give...
MgO + C
66. A certain metal Y is used to prepare an antacid, which is used as a medicine to treat acidity. This metal accidentally catches fire which cannot be put out by using CO2 based extinguishers. The metal Y is...
Mg
67. Sodium sulphate is soluble in water whereas Barium sulphate is sparingly soluble, because...
The lattice energy of BaSO4 is more than its hydration energy
68. The solubility of carbonates decrease down group 2 due to decrease in...
Hydration energies of cations
69. Magnalium is an alloy of...
Mg + Al
70. Permanent hard water, containing sulphate anions of calcium, can be removed by boiling
False
