Class 9th Chemistry Unit 8 Chemical Reactivity

chemistry 9th notes Chapter No 8

1. Electronegative character of elements            down the group and          as we move from left to right.


2. The valency of chlorine atom is:


3. Which are good conductor of heat and electricity?   


4. Metals are the elements which have:


5. The order of stability of Hydrides is:


6. Density of Sodium metal is:


7. Which is a weak acid?


8. Oxidizing power of                             is the highest.


9. Halogens belong to the group:


10. Density of Magnesium is:


11. Non-metals are generally soft, but which one of the following is extremely hard?


12. Sodium metal has electrons:


13. Metal oxides are:


14. Which of the following is less malleable?     


15. Which metal is not effected by the mineral acids and alkalis?


16. The flame colour of Magnesium is:


17. The most abundant metal is:


18. Which of the following nonmetal is lustrous?


19. Which one of the following is a metal?


20. Which of the following metals is highly reactive?


21. Platinum alloyed with which metal is used as catalyst in automobiles as catalytic convertor?


22. Potassium has           electrons in its valence shell.


23. Almost all metals are solid except:


24. Boiling point of Sodium is:


25. Group 17 elements are called:


26. Which of the following is a non-metal?


27. Boiling point of Magnesium is:


28. Melting point of Calcium is:


29. Which is strongest oxidizing agent?


30. Compounds of which element are widely used in photographic films and dental preparations?


31. Which halogen member exists in a liquid state at room temperature?


32. Metals react with oxygen to form:


33. One gram of which metal can be drawn into a wire of one and a half kilometer long?


34. Which of the following metal is lightest?


35. Sodium is extremely reactive metal, but it does not react with:


36. The heaviest metal is: 


37. All members of group I are alkali metals except:


38. Boiling point of Calcium is:


39. The elements in which d-orbital is in the process of filling constitute a group of metals called:


40. Which non-metal is good conductor of electricity?   


41. Which of the following statement is not true about metals?


42. The melting and boiling points of non-metals are:    


43. Identify least reactive metal(s) among the following:


44. 22 carat gold means that 22 part pure gold is alloyed with 2 parts of:


45. Which element has high electronegativity value?


46. What is the colour of sodium metal’s flame?


47. Which metal belongs to group-11?


48. Which group of elements has low ionization energies?


49. Non-Metals are ______ of heat and electricity:


50. Metals can form ions carrying charges:


51. Which of the following is not a noble metal?


52. Which statement is incorrect about non-metals?


53. Which one of the following is the lightest metal?     


54. Metals lose their electrons easily because:    


55. Which one is the most reactive metal?


56. Chlorine cannot oxidize:


57. Metals possess:          


58. Pure alkali metals can be cut simply by knife but iron cannot because of alkali metals have:


59.                        burns with brick red flame.


60. All metals bear:


61. The number of electrons lost by an atom of a metal is called its:


62. Which metal exists in liquid form at room temperature?


63. Which noble metal is used in catalytic converters in automobile?


64. Density of Calcium is:


65. Which of the following is a yellow metal?


66. Which one of the following does not react with dilute HCl?


67. Electropositive character decreases:


68. Metals have generally:


69. Which one of the following is soft and can be cut with knife?


70. Valence shell electronic configuration of alkaline earth metal is:


71. The flame colour of Calcium is:        


72. Non-metallic oxides are:


73. Which of the following elements is least non-metallic?


74. Which one of the following is brittle?


75. Non-metals form:


Short Questions

Give the chemical equations for the reaction of F and I with water.
 Show the decreasing strength of electronegativity of given elements: P, Br, O, I, C, Cl and F.
Can pure gold be used for making ornaments? If not why?
Define a metal. How can metals, be categorized?
Define eletropositivity.
Describe the existence form of halogens in nature
Discuss the purity of 22 carats gold.
Enlist any four chemical properties of non metals.
Give any two important applications of platinum.
Give the applications of silver.
Give the non-metallic trend in halogens.
Give the reaction of chlorine with sodium hydroxide.
Gold and silver is alloyed with copper for making ornaments. Why?
How can we distinguish a metal from a non-metal by simple physical methods
How does electropositivity depend upon the size and nuclear charge of an atom?
How does oxygen react with group II-A metals?
How electro positivity depends upon size and nuclear charge of an atom?
How is platinum used as a catalyst in automobiles and what are advantages of this use?
How we can distinguish a substance is metal or non-metal with the help of an acid?
Iodine exists in solid state can it be transformed into variety of shapes on hammering and rolling? Why or why not?
Iodine exists in solid state, can it be beaten with hammer to form sheets?
Name the metal which is the poorest conductor of heat?
Name the most abundant non-metal in the earth’s crust.
Name two non-metals which are both brittle and non-ductile.
On what factors does non-metallic character depend?
State some chemical properties of metals.
State some physical properties of metals.
State the any four physical properties of metals.
State the order of decreasing oxidizing power of halogens.
What are halogens and why are they named so?
What are halogens?
What are non-metals?
What do you mean by 24 carat gold?
What do you mean by metallic character?
What is difference between steel and stainless steel?
What is electropositivity? Explain with an example.
What is meant by malleability and ductility of metals?
What is relationship between electropositivity and ionization energy?
What is the composition of white gold?
What is the nature of metal oxide?
What is the trend of non-metallic character in periodic table?
What is the trend of variation in densities of alkali metals?
What make silver and gold less reactive?
What type of elements are metals?
Which factor controls the non-metallic character of the elements?
Which group of metals is highly reactive?
Which metal is used for metal work?
Which one is the most reactive and most useable metal?
Why alkali metals are more reactive than alkaline earth metals?
Why are ionization energies of alkaline earth metals higher than alkali metals?
Why calcium is more electropositive than magnesium?
Why do the non-metals accept electrons easily?
Why does electropositivity decrease from left to right in a period?
Why does metallic character decrease along a period and increase in a group?
Why does nitrogen form compounds with alkaline earth metals directly?
Why does reactivity of metals increase down the group?
Why elements of group 2 are less electropositive than those of group 1?
Why fluorine is more non-metallic than chlorine?
Why is copper used for making electrical wires?
Why is gold used to make jewelry?
Why is HF a weak acid?
Why is ionization energy of Na (sodium) less than Mg (magnesium)?
Why is magnesium harder than sodium?
Why is platinum used for making jewelry?
Why is silver not used in pure form?
Why is sodium metal more reactive than magnesium metal?
Why is the ionization energy of Na (sodium) more than K (potassium)?
Why is the second ionization energy of magnesium higher than its first ionization energy?
Why metallic character decreases along a period and increases in a group?
Why non-metals do not react with dilute acids while metals do react?
Why sodium metal is more reactive than magnesium metal?
Why the ionization energies of alkali metals are less than those of alkaline earth metals?
Why the oxygen is called non-metal?
Why valency of chlorine is 1?
Write down any two chemical properties of metals.
Write down the names of least ‘Reactive’ or ‘Noble metals’.
Write down the names of moderately reactive metals.
Write down the names of very reactive metals.
Write down the physical states of halogens.
Write down the trends of electropositive character in periodic table.
Write down the uses of Magnesium.
Write down the uses of Sodium.
Write down two chemical properties of non-metals.
Write down two physical properties of non-metals.
Write the name of a heaviest metal.


Long Questions


Compare and contrast the properties of alkali and alkaline earth metals.
Compare reactivity of halogens.
Compare the ionization energies of alkali and alkaline earth metals.
Compare the physical properties of metals and non-metals.
Define metals. Also write four chemical properties.
Discuss the inert character of silver and gold.
Discuss why hardness and softness of a metal depends upon its metallic bonding.
Give significance of non-metals.
Give the chemical properties of magnesium and its uses.
How platinum is used in automobiles? Explain.
How you can compare the softness and hardness of metals?
What are physical properties of calcium metal? Give its uses.
What are the chemical properties of non-metals.
Why cations are smaller and anions are bigger in size than their respective neutral atoms.
Write a comprehensive note on the electropositive character of metals?
Write chemical reaction of Chlorine with water and methane.
Write down four uses of magnesium.
Write down four uses of silver in daily life.
Write down the chemical properties of the non-metals?
Write down the four physical properties of metals.
Write four important physical properties of non-metals.
Write the reactions of Sodium with Cl₂, O₂, H₂O and H₂.

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