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Chitranjan Ram Singhal
Asked: 2022-10-29T17:03:29+05:30 In:

Assertion. In a unit cell of NaCl , all `Cl^-` ions touch `Na^+` ion as all well they touch each other .
Reason. Radius ratio `r_+//r_-` in NaCl is 0.414.
A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion is true , but reason is false
D. If both assertion and reason are false.

Assertion. In a unit cell of NaCl , all `Cl^-` ions touch `Na^+` ion as all well they touch each other .
Reason. Radius ratio `r_+//r_-` in NaCl is 0.414.
A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion is true , but reason is false
D. If both assertion and reason are false.
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1 Answer

  1. Correct Answer – D
    Correct A . In a unit cell of NaCl, all `Cl^-` ions touch `Na^+` ion but do not touch each other.
    Correct R . Actual radius ratio `r_(Na^+)//r_(Cl^-)` is 0.525 and not 0.414

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