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Statement-1 :Schottky type of defect is ...

Statement-1 :Schottky type of defect is shown by crystals with high co-ordination numbers .
Statement-2 :In Schottky defect , equal number of cations and anions are missing from their lattice sites

A

Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1

B

Statement-1 is true, statement-2 is true, statement-2 is not correct explanation for statement-1

C

Statement-1 is true, statement-2 is false

D

Statement-1 is false, statement-2 is true

Text Solution

Verified by Experts

The correct Answer is:
B
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Statement : Schottky defect is generally shown by the compounds with high co - ordination no. Explanation : Equal no. of cations and anions are missing from the lattice sites in Schottky defect.

Assertion (A) : The density of crystal having Schottky defect is lowered. Reason (R ) : The crystals suffering from Schottky defect have same number of cation and anions missing from their normal lattice sites.

A : In Schottky defect, density of crystal decreases. R : Equal number of cations and anions are missing in Schottky defect.

Which among the following statement is true about Schottky defect ?

Predict the structure of MgO crystal and the co-ordination number of the cation in which the radii of the cation and anion are 65 pm and 140 pm respectively.

Knowledge Check

  • Frenkel defect is shown by crystals having ...... coordination number

    A
    low
    B
    High
    C
    both
    D
    None

  • Assertion (A) : The density of crystal having Schottky defect is lowered. Reason (R ) : The crystals suffering from Schottky defect have same number of cation and anions missing from their normal lattice sites.

    A
    If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`
    B
    If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`
    C
    If `(A)` is correct, but `(R)` is incorrect.
    D
    If both `(A)` is incorrect, but `(R)` is correct.

  • A : In Schottky defect, density of crystal decreases. R : Equal number of cations and anions are missing in Schottky defect.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
    C
    If Assertion is true statement but Reason is false then mark (3)
    D
    If both Assertion and Reason are false statements, then mark (4)