Online Unit test -Classification of elements (Grade-10)

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Attempt all the questions. 25 ×2 =50 marks

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1.The modern classification of elements is based on the discovery of

2 points

(a) D.I. Mendeleev

(b) Lord Rayleigh

(d) Sir Ramsay

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2. Which of the following blocks of elements comprise transition elements?

2 points

a)s-block

(b) p-block

(d) f-block

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3.Choose the metalloid from amongst the following elements.

2 points

a)boron

(b) sodium

(d) aluminium

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4.Element with which of the following atomic numbers will be non-metallic in character?

2 points

a)12

b)20

d)16

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5.Choose the correct –statement about chemical reactivity of elements along a period and along a group…

2 points

a)decreases along a group

(b) increases along a group

c)increases along a period

(d) none

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6.One element M in the 13th group, the formula of its chloride is...

2 points

(a) MCl

(b) MCI2,

c)MCl3

d)MCl4

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7. The properties of the elements, as well as the formulae and properties periodic manner on the atomic weight of the elements.

2 points

(a) J. Lothar Meyer

(b) John A. R. Newlands

d)D.L.Mendeleev

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8. Elements belonging to the same group have similar properties because..

2 points

(a) they have similar electronic configuration of the outermost shell

(b) their atomic numbers go on increasing as we move down

(d) none of them

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9. With the increase in atomic number in period

2 points

(a) metallic character decreases

(b) metallic character increases

(d) chemical reactivity increases

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10. The atoms of elements belong to the same group of periodic table have the...

2 points

(a) number of protons

(b) number of electrons

(d) number of electrons in the outermost shell

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11.Which order of relative size amongst the following in incorrect?

2 points

(a) Li < Na <K

(b) C<Al < Si

(d) F<Cl <Br

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12. Which one of the following has the largest size?

2 points

(a) Na

(b) Mg

(d) Ca

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13. Which one of the following has the smallest size?

2 points

(a) Al

(b) Mg

c) Na

d)C

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14. On moving horizontally across a period, the number of electrons in the outermost from ...

2 points

(a) 2,8

(b) 2, 18

(d) 1,18

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15. The elements of IA group are called ?

2 points

a) Actinides

b) Lanthanides

c) Alkali metal

d) Alkaline earth metals

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16. The element with the smallest size in the group 13 is

2 points

(a) beryllium

(b) carbon

(d) boron

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17. Which of the following is not a noble gas?

2 points

(a) helium

(b) xenon

d)potasium

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18. The element with atomic number 9 resembles with the element..

2 points

(a) 8

b)17

c)12

d)13

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19.The elements of the group 17 are also called..

2 points

a)Halogens

b)alkai metal

(d)alkaline earth metals

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20.How many blocks are elements are divided ?

2 points

a)4

b) 5

c) 6

d)3

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21.Which of the following blocks of elements comprises inner transition elements ?

2 points

a)S-block

b) P- block

c) d-block

d) f- block

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22.Elements with which of the following atomic numbers will be non-metallic in character?

2 points

a)12

(b) 20

(d) 15

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23. Which statement is correct about Modern Periodic Table?

2 points

(a) number of protons determines the atomic number of the element

(b) it is based on the electronic configuration of elements

(d) all the above

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24. Mendeleev left one gap under B and Al, for an element, which was was discovered later on this elements was…

2 points

(a) Na

(b) Ca

d)Ba

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25.Which of the following element to is an alkaline earth metals ?

2 points

a)Na

b) Ar

b) Li

d) Mg

Option 5

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Best up Luck

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