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(A): Enthalpy of graphite is lower than ...

(A): Enthalpy of graphite is lower than that of diamond.
(R): Entropy of graphite is greater than that of diamond. 

A

Both A and R are true R is the correct explanation.

B

Both A and R are true R is not the correct explanation.

C

A is true but R is false

D

A is false but R is true

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • (A) : If a galvanometer is converted into an ammeter and a milliammeter then the shunt resistance of ammeter is lower than that of milliammeter. (R) : In Ammeter the current through shunt is less than that o galvonameter.

    A
    Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
    B
    Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
    C
    'A' is true and 'R' is false
    D
    'A' is false and 'R' is false

  • (A) Electronegitivity of Sb and Bi are the same (R ) Ionisation enthalpy of Bi is greater than that of Sb

    A
    Both (A) and (R ) are true and (R ) is the correct explanation of (A)
    B
    Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
    C
    (A) is true but (R ) is false
    D
    Both (A) and (R ) are false

  • Reactivity of borazole is greater than that of benzene because

    A
    borazole is non - polar compound
    B
    borazole is polar compound
    C
    borazole is electron deficient compound
    D
    De localized electrons in it

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    Diamond is insulator, but graphite is a conductor. Why?

    (A) The pka of acetic acid is lower than that of phenol. (R) Phenoxide ion is more resonance stabilised than acetate ion.

    (A): Electron affinity of fluorine is lower than that of chlorine (R): Fluorine has small and compact size and stronger inter electron repulsion than chlorine.

    (A): The hardness of silica is less than that of diamond . (R): In silica, each silicon atom is surrounded by two oxygen atoms whereas in diamond each carbon atom is surrounded by 4 carbon atoms

    (A)Enthalpy of physical adsorption is lower than chemical adsorption (R ) Molecules of adsorbate and adsorbent are held together by vanderwall forces in physical adsorption and by chemical bonds in chemical adsorption

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