# What Jamb Set: 50+ Hot Chemistry Likely questions in Jamb 2019

## INTRODUCTION (part 2)

Welcome to another edition of the poschools jamb tutorials and poschool hot topics In this Jamb tutorial series we will list out another 50 hot key points and likely jamb chemistry questions to pass jamb exam.

This article is prepared so that jambites can pass jamb chemistry with ease. For those of you just joining poschools for the first time click here to check the first 50+ key point series and likely jamb chemistry questions

It should be noted that this key points was prepared based on hot topics set in Jamb Chemistry past questions. This series will be released in a batch of 50 hot Chemistry and likely questions from all Jamb Chemistry topics. Note that this is the part 2 of the series.

This 50 points and likely chemistry questions will cover all topics in Jamb Chemistry. Although, this key points in Jamb Chemistry will not be arranged topic by topic. Jamb Hot Key points will also be available for so its wise you keep in touch with poschools and follow up with this hot topic series

Check out key points to blast/pass Jamb physics by clicking here

Check out key points to blast/pass Jamb biology by clicking here

Check out jamb syllabus and hot topics for all subjects by clicking here

Check out jamb repeated questions by clicking here

#### Key Points and likely jamb Chemistry questions(1 to 10)

1. Metallic properties decreases across the period from left to right and then increases down the group from top to bottom.
2. Electropositivity decereases across the period from left to right and increases down the group from top to bottom.
3. Elements in the same group have the same number of electrons in their outermost shell (Valence electrons).
4. The most reactive metal is francium it should also be noted that the francium is the most electropositive element.
5. Electronegativity increaseses along the period from left to right and decreases down the group from top to bottom.
6. The most electronegative element is flourine. It is also the most reactive non-metals
7. Flourine, oxygen, Nitrogen are strong electronegative elements that forms hydrogen bond when bonded with hydrogen ( HF, $H_{2}O, NH_{3}$).
8. Atomic radius of element decreases across the period from left to right and increases down the group from top to bottom.
9. The periodic table also exhibit diagonal relationship. Diagonal relationship is a phenomenon that allows element in the same diagonal to have similar chemical properties.
10. Lithium and magnesium exhibit diagonal relationship.
11. #### Likely Jamb 2019 chemistry questions and key points (11 to 20)

12. Berylium and aluminium exhibit diagonal relationship.
13. Boron and silicon exhibit diagonal relationship.
14. Carbon and phosphorus exhibit diagonal relationship.
15. Elements in the Same period have the same number of electron shells.
16. The number of shells in a period is equal to the “period number” : Elements in “period 1” has 1 electron shell (K -shell).
17. Elements in “period 2” has 2 electron shells (K and L shell)..
18. Elements in “period 3” has 3 electron shell (K,L and M -shell)..
19. Elements in the same group have similar physical and chemical properties.
20. Group one elements are also called alkaline metals.
21. Group two elements are also called alkaline earth metal.
22. #### Hot Topics and likely questions in Jamb Chemistry (21-30)

23. Electrovalent bond occurs as a result of electron(s) transfer from the metals to the non-metals.
24. Group 0ne and group two elements forms electrovalent or ionic bond with group 7 or group 6 element.
25. Electrovalent/Ionic compounds are soluble in water and other polar solvent except for magnesium oxide .
26. Electrovalent/Ionic compounds have high melting and boiling points they can also be used as electrolytes in their molten form or when dissolved in water.
27. Covalent bonding involves the sharing of electrons .
28. In ordinary covalent bonding the electrons to be shared is donated by each elements in the bond. The electrons donated by each element is known as shared pair
29. In coordinating or dative covalent bonding, the electron(s) to be shared is donated by just one elements. This donated electron is known as a lone pair
30. Covalent compounds are soluble in non-polar solvent like ether, benzene e.t.c.. It should be noted that covalent compounds are not soluble in polar solvent like water.
31. Covalent compounds are majorly liquids and gases characterised by low melting and boiling points.
32. Covalent compound do not conduct electricity and as such, they cannot be used as electrolytes.
33. #### Likely Jamb Chemistry questions to note(31-40)

34. Evaporation and Boiling both involves the conversion of liquid to gas(Both processes involves change of state) the differences between boiling and evaporation are listed below:
• Boiling occurs at constant temperature whereas evaporation occurs at all temperature
• Evaporation causes cooling whereas boiling does not
• Boiling occurs when the saturated vapour pressure is equals to the prevailing atmospheric pressure whereas evaporation occurs at all pressures
• Boiling occurs throughout the whole liquid whereas evaporation occurs at just the surface of the liquid.
35. Group 1 and Group 2 are s-block elements.
36. The transistion elements are all metals and they are located between the group 2 and the group 3 elements of the periodic table
37. are metals with high melting and boiling points, have coloured ions, have variable valency and also have complexi
38. The lanthanide and actinide elements are also known as inner transistion metals
39. Air is a mixture that contains Nitrogen, oxygen, carbon(iv)oxide, water vapour and other rare gases.
40. Air contains 78-79% of Nitrogen by volume.
41. Air contains 20-21% of oxygen by volume.
42. Air contains 0.03% carbon(iv)oxide.
43. Oxygen. is the most active constituent of air

#### Hot 2019 key points in chemistry(41-50)

44. Nitrogen acts as a diluent that helps to regulate combustion/rusting and other processes that involves the use of oxygen
45. Galvanized iron is produced by coating iron with zinc
46. Rusting and burning are oxidation processes
47. The corrosion of iron is termed rusting
48. The Basicity of an acid is the number of replaceable hydrogen ion
49. The basicity of $H_{2}SO_{4}$ is 2; THe basicity of HCL is 1; The bascicity of $H_{3}PO_{4}$ is 3; The basicity of ethanoic acid $CH_{3}COOH$ is 1.
50. Acid with a basicity greater than one can form acid salts when the hydrogen is partially replaced by other positive ions.
51. Alkaline with a basicity greater than one can form basic salt.
52. Trioxonitrate(v) acid $HN0_{3}$ does not react with metals to liberate hydrogen gas. This is because being a strong oxidizing agent, the acid oxidizes the hydrogen to water while it is reduce to nitrogen(vi) oxide gas
53. Strong acids are acid that ionizes completely in water the 3 most popular strong acid are:
• Tetraoxosulphate(vi) acid $H_{2}SO_{4}$:
• Trioxonitrate(v) acid $HNO_{3}$:
• Hydrochloric acid:

Alright guys. Stay tuned for part two hot key points to blast Jamb commerce

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1. March 15, 2019

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2. March 15, 2019

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