Top 500+ 9th Class Chemistry Subject Mcqs Pdf Download Chapter 08

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Chemical Reactivity

Encircle the most appropriate answer among the following options

1          Non-metals are essential

(a) for the maintenance

(b) for the existence

(c) for the safety of life

(d) all of these

2          It has the highest percentage in earth’s crust and oceans.

(a) calcium

(b) carbon

(c) oxygen

(d) nitrogen

3          The electronegative and non-metallic character from top to bottom

(a) increases

(b) decreases

(c) remain same

(d) stable

4          Chlorine only reacts with methane in

(a) darkness

(b) sunlight

(c) yellow light

(d) screened light

5          Chlorine has colour:

(a) pale yellow

(b) greenish yellow

(c) reddish brown

(d) purple black

6          These are highly oxidizing agents

(a) alkali metals

(b) alkaline earth metals

(c) transition metals

(d) halogens

7          The highest electronegative element in periodic table is

(a) fluorine

(b) chlorine

(c) bromine

(d) iodine

8          The electronic configuration of halogens is

(a) ns2 np5

(b) ns2np3

(c) ns3np5

(d) ns2 np2

9          Non-metals are electronegative in nature and form oxides.

(a) acidic

(b) basic

(c) neutral

(d) suboxide

10        It is used to make jewelry items because of its unique characteristics like colour beauty, strength, flexibility and resistance to tarnish.

(a) gold

(b) platinum

(c) silver

(d) copper

11        White gold is an alloy of

(a) gold + palladium + zinc

(b) palladium + silver + nickel

(c) gold + silver + copper

(d) palladium + nickel + zinc

12        The alkaline earth metals are smaller in size and have more

(a) ionization energy

(b) electron affinity

(c) nuclear change

(d) electropositive

13        All alkali metals have the largest size and the lowest in their respective periods.

(a) electro negativity

(b) ionization energy

(c) electron affinity

(d) electro positivity

14        Metals have the tendency to lose their valence electron. This property of a metal is termed as

(a) electro negativity

(b) electro positivity

(c) electron affinity

(d) ionization power

15        Copper, mercury, silver and gold are the examples of metals

(a) very reactive

(b) moderately

(c) least reactive

(d) none of these

16        Cation in formed, when an element – electron to its outermost shell

(a) loses

(b) gains

(c) donates

(d) shares

17        Metals which are easily oxidized are said

(a) negative metals

(b) state metals

(c) reactive metals

(d) non-reactive metals

18        A metal in a compound always exists in which oxidation sate

(a) negative

(b) positive

(c) neutral

(d) zero

19        Ionization energy of sodium is less than

(a) aluminum

(b) magnesium

(c) copper

(d) all of these

20        All metals are solids except

(a) sodium

(b) magnesium

(c) mercury

(d) gold

21        The most valuable metal among the following is

(a) Gold

(b) Uranium

(c) Osmium

(d) Rubidium

22        The heaviest metal is

(a) Uranium

(b) Gold

(c) Osmium

(d) Calcium

23        Lithium has density

(a) 0.53gcm-3

(b) 1.53gcm -3

(c) 15.3gcm -3

(d) 3.5gcm -3

24        Mark which one is non-metal?

(a) Sodium

(b) Calcium

(c) Nitrogen

(d) Mercury

25        Which one of the following will not react with HCI?

(a) Carbon

(b) Silver

(c) Zinc

(d) Copper

26        Sodium does not react with

(a) Carbon

(b) Nitrogen

(c) Hydrogen

(d) Both a and b

27        Which metal burns with golden yellow flame

(a) Calcium

(b) Barium

(c) Sodium

(d) Potassium

28        Which metal is used in Thermite process to ignite aluminum powder

(a) Na

(b) Mg

(c) Ca

(d) Be

29        Silver is get tarnished by

(a) Atmosphere oxygen

(b) Nitrogen

(c) Hydrogen sulphide

(d) Carbon dioxide

30        Which metal is used for making mirrors?

(a) Lead

(b) Iron

(c) Silver

(d) Lithium

31        Which one of the following metal has yellow colour

(a) Lead

(b) Gold

(c) Iron

(d) Potassium

32        Gold is always alloyed with one, among the following metals

(a) Sodium

(b) Mercury

(c) Copper

(d) Calcium

33        Sodium is used for the refining of which metal

(a) U

(b) Zn

(c) Ti

(d) Zr

34        How many series of d-block elements are there in the periodic

(a) Three

(b) Four

(c) Five

(d) Two

35        Three transition elements Cu, Ag and Au constitute group number

(a) 9

(b) 10

(c) 11

(d) 12

36        The least electronegative element among the halogens is

(a) Fluorine

(b) Chlorine

(c) Bromine

(d) Iodine

37        Which of the following halogen has pale yellow colour?

(a) F2

(b) Cl2

(c) Br2

(d) I2

38        Which one of the following makes covalent bond with halogens

(a) Na

(b) K

(c) O

(d) Mg

39        Identify among the following which one is semimetal

(a) Lead

(b) Zinc

(c) Silicon

(d) Galium

40        The general electronic valence shell configuration of alkali metals is

(a) ns2

(b) ns1

(c) ns2, np1

(d) ns2, np2

41        Hydrogen is released when water reacts with

(a) Na

(b) Mg

(c) K

(d) All of them

42        Which metal releases electron from its outermost shell the most easily

(a) Na

(b) K

(c) Mg

(d) Ca

43        Which one among the halogens has least affinity with hydrogen?

(a) F2

(b) CL2

(c) Br2

(d) I2

44        In diffused sun lights chlorine reacts with methane to form

(a) CH3CL

(b) CH2CL2

(c) CCL4

(d) All of above

45        In the earth crust the highest %age of oxygen is

(a) 47%

(b) 86%

(c) 90%

(d) 24%

46        The age of oxygen in oceans is:

(a) 47%

(b) 86%

(c) 90%

(d) 24%

47        The %age of oxygens in air is:

(a) 21%

(b) 24%

(c) 26%

(d) 30%

48        Which one of the following will form amphoteric oxides?

(a) Na

(b) Na

(c) Si  |

(d) S

49        Which halogen reacts with water in dark and cold state

(a) F2

(b) Cl2

(c) Br2

(d) I2

50        Select the least reactive metal among the following

(a) Gold

(b) Zinc

(c) Iron

(d) Tin