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(A) : Natural rubber is elastic and non-...

(A) : Natural rubber is elastic and non-cryslalline.
(R) : Weak vander Waal's forces are present.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

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The correct Answer is:
B
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It is not possible to measure the atomic radius precisely since the electron cloud surrounding the atom doesnot have sharp boundary. One practical approach to estimate the size of an atom of a non-metallic element is to measure the distance between two atoms when they are bound together by a single bond in a covalent molecule and then dividing by two. For metals we define the term "metallic radius" which is taken as half the internuclear distance separating the metal cores in the metallic crystal. The vander Waal's radius represents the overall size of the atoms which includes its valence shell in a nonbonded situation. It is the half of the distance between two similar atoms in separate molecules in a solid. The atomic radius decreases across a period and increases down the group. Same trends are observed in case of ionic radius. Ionic radius of the species having same number of electrons depends on the number of protons in their nuclei. The size of iso electronic species -F^(-) , Na^(+) and Mg^(2+) is effected by

AAKASH SERIES-POLYMERS-Level - I (Exercise - II) (Assertion (A) & Reason (R) type questions)
  1. (A) : The gross mobility of elastomer chain is its special characteris...

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  2. (A) : Natural rubber is an addition polymer. (R) : Natural rubber ha...

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  3. (A) : Natural rubber is elastic and non-cryslalline. (R) : Weak vand...

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  4. (A) Polypropylene is an addition polymer (R) : Polypropylene is poly...

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  5. (A) : Polybutadiene is an example of chain growth polymer (R) : In c...

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  6. (A) The polymerization of propylene is carried out in presence of SnCl...

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  7. (A) : Most of the polymeric materials are non biodegradable (R) : Bu...

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  8. (A) : Cellulose acetate and cellulose nitrate are used in textiles bec...

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  9. (A) : Styrene is more reactive than propene towards cationic polymeriz...

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  10. (A) : Bakelite is copolymer (R) : Bakelite is a thermosetting materi...

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  11. (A) : Glyptal is obtained by the condensation polymerization of ethyle...

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  12. (A) : Novac is heated in presence of hexamethyl tetramine to form hard...

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  13. (A) : Nylon 6,6 is a fibre. Because (R) : It is an addition polymer

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  14. (A) Nylon - 6,6 is classified as a condensation heteropolymer. (R) :...

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  15. (A) : Bakelite is thermosetting polymer. (R) : Bakelite has three di...

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  16. (A) : Natural rubber is a polymer of cis-isoprene (R) : Poly trans i...

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  17. (A) : The vulcanised rubber has greater elasticity and tensile strengt...

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  18. (A) : Addition of CH(3)COOH and HCOOH electrolytes causes coagulation ...

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  19. (A) : Osmotic pressure method is the most suitable method to determine...

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  20. (A) : Molecular mass of polymers is always expressed as an average (...

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