d & f block element objective question for Neet,Jee and Other Competitive Examination

 TRANSITION METALS INCLUDING LANTHANIDES

Q 1-  Which of the following ions has the maximum magnetic moment ? (JEE 2015)
(i) Mn^+2
(ii)Fe^+2
(iii)Ti^+2
(iv)Cr^+2
Answer:- (i) is the correct answer
We know that Mn^+2 (3p^63D^5) has the maximum number of unpaired electron and has maximum moment.

Q2- A reduction in atomic size with increase in atomic number is a chracterstics of element of
? 
(a) high atomic masses
(b) d- block 
(c) f- block
(d)radioactive series
Answer:- c is the correct answer

Q3- The number of d electron retained in Fe^+2 ions is 
 
Answer:-Only 6 electron.

Q4- The Lathanide contractions is the responsible for the fact that  ? (VERY IMP FOR IIT)
Answer:  in the vertical coloumn of transition element,the element of 2nd and 3rd transition series resemble to each other more closely the elements,The pairs os element such as Zr-Hf,Mo-W,Nb-Ta etc posses almost same properties.