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(A): The atomic size of gallium is less ...

(A): The atomic size of gallium is less than expected
(R): In gallium the `3^(10)` delectrons do not shield effectively

A

A and R are true, R explains A

B

A and R are true, R does not explain A

C

A is true, but R is false

D

A is false, but R is true

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The correct Answer is:
A
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AAKASH SERIES-ELEMENTS OF BORON FAMILY-OBJECTIVE EXERCISE -1 (General introduction and properties)
  1. IIIA group element which forms only convalent compounds either in anhy...

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  2. Which of the following is most abundant in the earth crust ?

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  3. (A): The atomic size of gallium is less than expected (R): In galli...

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  4. +1 oxidation state is stable for the element

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  5. The element that exhibits negative oxidation state in IIIA group is

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  6. Among the III A group elements, the difference in the atomic radius is...

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  7. Aluminium exhibits diagonal relationship with

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  8. Which element cannot form a cation ?

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  9. Electronic structure acquired by compounds of IIIA group elements in b...

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  10. The nature of B2 O3 is

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  11. Thallous chloride is more stable than thallic chloride because of

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  12. Which of the following pair of elements have same atomic radius

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  13. Thallium shows different oxidation states because

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  14. Which of the following is used in high temperature thermomertry?

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  15. (A) : Among IIIA group elements, Boron has highest melting point (R...

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  16. Which one is a non-metal in group 13 ?

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  17. The electropositive character increases from B to Al and then decrease...

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  18. When boron atom undergoes sp^3 hybridization

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  19. Boron exhibits diagonal relationship with

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  20. (A): TICl3 acts as a good oxidant (R): T2^(+3) is less stable than T...

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