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CBSE

NEET Chemistry : d અને f વિભાગના તત્વો

Multiple Choice Questions

31. Ce³⁺, La³⁺, Pm³⁺, Yb³⁺ ની આયન ત્રિજ્યાનો સાચો ચડતો ક્રમ જણાવો.

$Yb to the power of 3 plus end exponent space less than space Pm to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent space less than space Ce to the power of 3 plus end exponent$
$Yb to the power of 3 plus end exponent space less than space Pm to the power of 3 plus end exponent space less than space Ce to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent$
$Yb to the power of 3 plus end exponent space equals space Pm to the power of 3 plus end exponent space less than space Ce to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent$
$Yb to the power of 3 plus end exponent space less than space Pm to the power of 3 plus end exponent space equals space Ce to the power of 3 plus end exponent space greater than space La to the power of 3 plus end exponent$

Yb to the power of 3 plus end exponent space less than space Pm to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent space less than space Ce to the power of 3 plus end exponent

32.

V, Cr, Mn અને Fe ના પરમાણુ-ક્રમાંક અનુક્રમે 23, 24, 25 અને 26 છે. અ પૈકી કયા તત્વની દ્વિતીય આયનીકરણ એન્થાલ્પી સૌથી વધુ હશે ?

33. $bold L presubscript bold 57 superscript bold 3 bold plus end superscript$ ને ત્રિજ્યા 1.06 A° છે, તો $bold Lu presubscript bold 71 superscript bold 3 bold plus end superscript$ ની ત્રિજ્યાના મુલ્ય નીચેના પૈકી કયા મુલ્યની લગભગ નજીક હશે ?

1.60 A°
0.85 A°
1.06 A°
1.40 A°

34. $bold Y to the power of bold 3 bold plus end exponent bold comma bold space bold La to the power of bold 3 bold plus end exponent bold comma bold space bold Eu to the power of bold 3 bold plus end exponent$ અને $bold Lu to the power of bold 3 bold plus end exponent$ ની આયોનિક ત્રિજ્યાનો સાચો ક્રમ કયો છે ?

$La to the power of 3 plus end exponent space less than space Eu to the power of 3 plus end exponent space less than space Lu to the power of 3 plus end exponent space less than space straight Y to the power of 3 plus end exponent$
$Lu to the power of 3 plus end exponent space less than space Eu to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent space less than space straight Y to the power of 3 plus end exponent$
$straight Y to the power of 3 plus end exponent space less than space La to the power of 3 plus end exponent space less than space Eu to the power of 3 plus end exponent space less than space Lu to the power of 3 plus end exponent$
$straight Y to the power of 3 plus end exponent space less than space Lu to the power of 3 plus end exponent space less than space Eu to the power of 3 plus end exponent space equals space La to the power of 3 plus end exponent$