d and f block

Question 1

d block comprises of group?

Answer 1

3-12

Question 2

why are zinc cadmium and mercury not considered as transition element?

Answer 2

because the have d10 configuration and common oxidation st in ground and ionised state

Question 3

what is the genreal electronic configuration of d block element?

Answer 3

(n-1)d^1-10 ns^1-2

Question 4

there is an increase in the melting point upto d5 configuration and then it falls gradually. this is for all the d block element except?

Answer 4

manganese and technicium

Question 5

______ is an important factor in determining standard electrode potential.

Answer 5

enthalpy of atomisation

Question 6

ions with same charge on increasing atomic number have inc/ dec in their radius? and why

Answer 6

decreases as the shielding effect of d orbital is less and hence the net electrostatic attraction increases between nuclear charge and the outermost electron inc and the ionic radius decreases.

Question 7

what is lanthanoid contraction?

Answer 7

when the 4f orbital gets filler earlier than 5d their is a decrease in atomic radii and this is called lanthanoid contraction.

Question 8

what is the trend in density in d block?

Answer 8

increases left to right

Question 9

metallic radii trend in 1st series of d block?

Answer 9

co=ni

Question 10

name the element which contains all the oxidation no from +2 to +7.

Answer 10

manganese