Chemistry_Class-11_Chapter-3_Topic-6_Valency and Oxidation State

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1. Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is

(a) Al2O3 < SiO2 < SO2 < P2O3

(b) SiO2 < SO2 < Al2O3 < P2O3

(d) Al2O3 < SiO2 < P2O3 < SO2

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2. Metallic nature and basic nature of the oxides ………. As we move along a period

(a) Increases

(b) Decreases

(d) Remains constant

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3. Which will show maximum non-metallic character

(a) B

(b) Be

(d) Al

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4. Which of the following set has the strongest tendency to form anions

(a) Ga, In and Te

(b) Na, Mg and Al

(d) V, Cr and Mn

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5. An element of atomic weight 40 has 2, 8, 8, 2, as the electronic configuration. Which one of the following statements regarding this element is not correct

(a) It belongs to II group of the periodic table

(b) It has 20 neutrons

(d) It belongs to 4th period of the periodic table

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6. The halogen that is most easily reduced is

(a) F2

(b) Cl2

(d) i2

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7. The maximum valency of an element with atomic number 7 is

(a) 2

(b) 5

(d) 3

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8. Which of the following metal exhibits more than one oxidation state

(a) Na

(b) Mg

(d) Al

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9. Which of the following elements shows maximum number of different oxidation states in its compounds

(a) Eu

(b) La

(d) Am

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10. Which is the weakest base

(a) NaOH

(b) KOH

(d) Zn(OH)2

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11. Which of the following elements is found in native state

(a) Al

(b) Au

(d) Na

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12. Which one of the following oxides is neutral

(a) CO

(b) SnO2

(d) SiO2

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13. Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation state

(a) 3d3 4s2

(b) 3d5 4s1

(d) 3d2 4s2

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14. Acidity of pentoxides in VA group

(a) Decreases

(b) Increases

(d) None

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15. Which of the following element shows maximum valency

(a) Carbon

(b) Barium

(d) Sulphur

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16. The correct order of increasing order of oxidizing power is

(a) F2 < Cl2 < Br2 < I2

(b) F2 < Br2 < Cl2 < I2

(d) I2 < Br2 < Cl2 < F2

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17. In any short period the valency of an element with respect to oxygen

(a) Increases one by one from IA and VIIA

(b) Decreases one by one from IA and VIIA

(d) Decreases one by one from IA to IVA and then increases from VA and VIIA one by one

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18. Which of the following gas does not have an octet or eight electrons in the outer shell

(a) Ne

(b) Ar

(d) He

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19. Fluorine is the best oxidizing agent because it has

(a) Highest electron affinity

(b) Highest 𝐸 ̇red

(d) Lowest electron affinity

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20. Which of the following oxides is most basic

(a) Na2O

(b) Al2O3

(d) SO2

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21. In the periodic table, the metallic character of elements

(a) Decreases from left to right across a period and on descending a group

(b) Decreases from left to right across a period and increases on descending a group

(d) Increases from left to right across a period and decreases on descending a group

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22. In a periodic table the basic character of oxides

(a) Increases from left to right and decreases from top to bottom

(b) Decreases from right to left and increases from top to bottom

(d) Decreases from left to right

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23. Elements A and B with their respective electronic configurations 3d 10 4s¹ and 4d10 5s¹ in their outermost shell, are

(a) Both non-metals

(b) Both coinage metals

(d) A is a coinage metal and B is non-metal

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24. The stable bivalency of Pb and trivalency of Bi is

(a) Due to d contraction in Pb and Bi

(b) Due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effect

(d) Due to attainment of noble configuration

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25. Out of the following elements which one do you expect to be most reactive chemically

(a) Mg

(b) Ca

(d) Ba

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26. Thallium shows different oxidation states because

(a) It is a transition element

(b) Of inert pair effect

(d) Of its higher reactivity

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27. The most stable oxidation state exhibited by thallium is

(a) 0

(b) +1

(d) +3

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28. An element 'X' which occurs in the first short period has an outer electronic structure s2 p1 . What is the formula and acid-base character of its oxides

(a) XO3 , basic

(b) X2O3 , basic

(d) XO2 , acidic

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29. Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides

(a) Al2O3 < MgO < Na2O <K2O

(b) MgO < K2O < AL2O3 < Na2O

(d) K2O< Na2O < AL2O3 < MgO

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30. Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in

(a) Forming covalent halides

(b) Forming polymeric hydrides

(d) Exhibiting amphoteric nature in their oxides

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