GROUP 1A ELEMENTS
GROUP 1A ELEMENTS
Total Questions: 60
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1. Atoms of elements that are in the same group have the same number of...
Valence electrons
2. Which of the following elements is an alkali metal?
Sodium
3. Each column of the periodic table is a...
Group
4. Atoms that gain or lose electrons are called...
Ions
5. Elements that have one valence electron tend to be...
Highly reactive
6. What is the name given to elements in group 1 excluding Hydrogen
Alkali metals
7. Why must the elements in group 1 be stored under inert conditions?
They react quickly with air
8. What is produced when sodium reacts with water?
Sodium hydroxide and hydrogen
9. What would you expect to see when a piece of potassium is placed into a bowl of water?
Floats, fizzes, moves around quickly, sparks
10. How can you tell that the solution formed after a group 1 element has reacted with water is alkaline?
Turns universal indicator purple
11. Which of these equations shows the process of a potassium atom losing an electron?
K→K+ + e-
12. Why is sodium more reactive than Lithium?
The outer electron is further from the nucleus, so it is lost more easily
13. What are the products of this equation: 2Na + 2H2O→...
2NaOH + H2
14. What flame colour is seen when potassium ignites in water?
Lilac
15. Which of the following metals is not an alkali metal?
Magnesium
16. Alkali metals have the biggest atomic radius in their respective periods.
True
17. The melting point of alkali metals are usually...
Low
18. Alkali metals are strongly
Electropositive
19. Caesium gives off a _ coloured flame when it is exposed to sufficient heat
Blue
20. All alkali metals are good _ agents
Reducing
21. What happens when alkali metals are exposed to moist air?
Formation of oxides
22. Sodium peroxide is _ in colour and potassium superoxide is used as a source of _
Yellow, oxygen
23. Which of the following is true regarding the reactivity order of alkali metals
Li<Na<K<Rb<Fr<Cs
24. Which of these alkali metals has the highest melting and boiling points in group 1?
Lithium
25. Which of these alkali metals can form nitride with nitrogen?
Li
26. LiF is _ in water. Why?
Insoluble, covalent character
27. Alkali metals dissolve in liquid ammonia to give _ coloured solution when dilute
Blue
28. Hydroxides of alkali metals are usually _ in colour
White
29. On heating Lithium nitrate, which of the following is not formed?
Hydrogen
30. Which of the following salts is known as Chile salt peter?
Sodium nitrate
31. Which of the following alkali metals cannot form superoxide?
Li
32. Which of the following is true with respect to basic strength?
Caesium oxide is more basic than potassium oxide
33. Superoxides of alkali metals are coloured and _
Paramagnetic
34. Lithium chloride is more covalent than potassium chloride.
True
35. Alkali metals will lose their valence electron to form ions with what type of charge?
+1
36. Which of the following alkali metals is the most reactive?
Caesium
37. All these are properties of alkali metals except
High melting point
38. Francium has an estimated half life of about...
22 minutes
39. Alkali metals possess what type of crystal structure?
Body centered cubic
40. Sodium ionic radii is larger than its atomic radii
False
41. An unknown soft metal is brought into the chemical lab. During tests, it was observed that the metal floats on water while reacting with it, reaction speed with water was slow. On exposure of the unknown metal to air, a black tarnish was formed after sometime. On exposure of the unknown metal to heat, a Crimson flame was produced. What can you deduce is the name of this metal?
Lithium
42. One of these chlorides is deliquescent
LiCl
43. On heating nitrates of alkali metals other than Lithium, _ and _ are produced.
Metal nitrite + Oxygen
44. One of these alkali metals does not appear silvery at room temperature.
Caesium
45. Sodium gives off a _ coloured flame when heated in a hot Bunsen burner
Yellow
46. Sodium carbide can be formed by heating sodium together with _
Ethyne
47. Sodium would react with nitrogen to give sodium nitride
False
48. _ is the first metal to be officially extracted by electrolysis
K
49. What happened to melting and boiling points as we moved down the group of alkali metals?
Melting and boiling points decreased
50. Potassium gives off a _ coloured flame when heated in a hot Bunsen burner
Lilac
51. Rubidium burns with a _ coloured flame when exposed to heat
Red
52. One of these alkali metals was the first to be discovered by a spectroscope
Caesium
53. _ gives off a blue coloured flame when exposed to sufficient heat
Caesium
54. Many people believe Francium to be the most electropositive element and more reactive than caesium. As a learned Funaabite, what would you say about that?
I disagree with them
55. Many videos online showed an atomic bomb-like reaction between Francium and water. As a learned Funaabite, would you believe those videos as true?
No
56. One of these alkali metals is used in the most accurate atomic clocks, making science successful in perfectly measuring the unit 'second'
Cs
57. Francium was discovered by _
Marguerite Perey
58. Francium is a radioactive element formed by the radioactive decay of _
Actinium
59. One of these alkali metals is synthetic
Fr
60. Alkali metals are called 'Alkali metals' because...
They form strongly alkaline solutions when they react with water
