Unit no.8 MCQs of 9th Class Chemistry

Unit no.8 MCQS of 9th Class Chemistry

Chemical reactivity:

1. Metals can form ions carrying charges:

a. Tri-positive
b. Di-positive
c. Uni-positive
d. All of them

d. All of them

2. Which one of the following metals burns with a brick red
flame?

a. Iron
b. Sodium
c. Calcium
d. Magnesium

c. Calcium

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

a. Sulphur
b. Hydrogen
c. Phosphorus
d. Nitrogen

d. Nitrogen

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

a. Lithium
b. Calcium
c. Sodium
d. Magnesium

c. Sodium

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

a. Non-metallic bonding
b. Strong metallic bonding
c. Moderate metallic bonding
d. Weak metallic bonding

d. Weak metallic bonding

6. Which of the following is less malleable?

a. Gold
b. Sodium
c. Silver
d. Iron

b. Sodium

7. Metal lose their electrons easily because:

a. They are electropositive
b. They are electronegativity
c. Good conductors of heat
d. They have electron affinity

a. They are electropositive

8. Which one of the following is brittle?

a. Selenium
b. Sodium
c. Magnesium
d. Aluminum

a. Selenium

9. Metals generally have:

a. Greater electron affinity value
b. Greater ionization value
c. Greater electro negativity value
d. Less ionization value

b. Greater ionization value

10. The most lightest metal is:

a. Magnesium
b. Lithium
c. Calcium
d. Sodium

b. Lithium

11. The most value able metal is:

a. Gold
b. Silver
c. Copper
d. Platinum

d. Platinum

12. Which of the following metal is the least conductor of heat?

a. Copper
b. Zinc
c. Iron
d. Lead

d. Lead

13. Which of the following metal is not solid?

a. Gold
b. Zinc
c. Silver
d. Mercury

d. Mercury

14. Mercury exists in:

a. Gaseous
b. Solid
c. Plasma
d. Liquid

d. Liquid

15. Atomic size of sodium is:

a. 185 pm
b. 160 pm
c. 186 pm
d. 162 pm

c. 186 pm

16. Most reactive metal is:

a. Potassium
b. Cesium
c. Sodium
d. Rubidium

a. Potassium

17. The color of flame of calcium burning in air is:

a. Reddish brown
b. Purple black
c. Reddish
d. Golden black

c. Reddish

18. Metals form after reacting with oxygen:

a. Amphoteric oxide
b. Acidic acid
c. Neutral oxide
d. Basic oxide

d. Basic oxide

19. Which of the following metal burns with pale yellow flame in air?

a. Iron
b. Calcium
c. Sodium
d. Magnesium

c. Sodium

20. Which metal floats over water?

a. Sodium
b. Calcium
c. Potassium
d. Magnesium

a. Sodium

21. Color of magnesium when it burns in air is:

a. Golden yellow
b. Brilliant white
c. Pale yellow
d. Red like brick

b. Brilliant white

22. …… burns brick like flame?

a. Calcium
b. Sodium
c. Magnesium
d. Potassium

a. Calcium

23. Color of flame of calcium in air is:

a. Reddish brown
b. Brick red
c. Purple black
d. Golden yellow

b. Brick red

24. …… metal is break able:

a. Aluminium
b. Magnesium
c. Sodium
d. Barium

c. Sodium

25. Heaviest metal is:

a. Osmium
b. Iron
c. Lead
d. Platinum

d. Platinum

26. The most frequent occurring metal is:

a. Silver
b. Aluminium
c. Platinum
d. Gold

b. Aluminium

27. The color of flame of sodium in air is:

a. Red
b. Golden yellow
c. Reddish
d. Brilliant white

b. Golden yellow

28. Which metal can be drawn into a wire of one and a half kilometer long from one gram?

a. Iron
b. Silver
c. Calcium
d. Gold

d. Gold

29. A metal which is soft and can be cut by knife is:

a. Magnesium
b. Calcium
c. Iron
d. Sodium

d. Sodium

30. Which metal has no effect of mineral acid or alkali on it?

a. Gold
b. Iron
c. Sodium
d. Zinc

a. Gold

31. Metals lose their electrons and form:

a. Electrodes
b. Cations
c. Solutions
d. Anions

b. Cations

32. The most reactive metal is:

a. Lead
b. Zinc
c. Sodium
d. Iron

c. Sodium

33. Least reactive metal is:

a. Tin
b. Mercury
c. Iron
d. Potassium

b. Mercury

34. The densities of metals are:

a. Very low
b. High
c. Moderate
d. Low

b. High

35. Metals react with oxygen to form:

a. Neutral oxides
b. Acidic oxides
c. Chlorides
d. Basic oxides

d. Basic oxides

36. The type of bonding in metals is:

a. Coordinate covalent
b. Ionic
c. Metallic
d. Covalent

c. Metallic

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

a. Hydration
b. Valency
c. Reduction
d. Bonding

b. Valency

38. The ionization energy of sodium is:

a. 570kJmol^-1
b. 460kJmol^-1
c. 600kJmol^-1
d. 496kJmol^-1

d. 496kJmol^-1

39. Sodium metal can lose electrons:

a. 3
b. 1
c. 4
d. 2

b. 1

40. The boiling point of sodium is:

a. 77^oc
b. 883^oc
c. 97^oc
d. 880^oc

b. 883^oc

41. The melting point of magnesium is:

a. 640^oc
b. 600^oc
c. 700^oc
d. 650^oc

d. 650^oc

42. Which alloy is used as a coolant in nuclear reactors?

a. Potassium-magnesium alloy
b. Sodium-potassium alloy
c. Sodium-magnesium alloy
d. Calcium-magnesium alloy

b. Sodium-potassium alloy

43. Which one of the following non-metal is lustrous?

a. Iodine
b. Sulphur
c. Carbon
d. Phosphorus

c. Carbon

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

a. Iodine
b. Graphite
c. Diamond
d. Phosphorus

c. Diamond

45. Which one of the following will not react with dilute HC:

a. Calcium
b. Sodium
c. Carbon
d. Potassium

c. Carbon

46. Which of the following nonmetal is shiny?

a. Fluorine
b. Iodine
c. Sulphur
d. Carbon

d. Carbon

47. Color of fluorine is:

a. Reddish brown
b. Light yellow
c. Purple black
d. Greenish

b. Light yellow

48. All non-metals are dull and non-shiny except:

a. Fluorine
b. Oxygen
c. Iodine
d. Nitrogen

c. Iodine

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9th class chemistry Chapter no.8 MCQs