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Which of the following statements is//ar...

Which of the following statements is`//are` correct ?

A

Successive `IE's` are lower.

B

Less energy is required to remove and electron from a alf-filled shell or completely filled shell.

C

`IE_(1)` or `Al lt IE_(1)` of `Mg`

D

`IE_(1)` of `Be gt IE_(1)` of `B`

Text Solution

Verified by Experts

The correct Answer is:
C, D
False. `IE_(3) gt gt IE_(2) gt IE_(1)`
Successive `IE's` are always higher as the force of attraction increases towards nucleus due to lesser number of electrons.
b. False. More energy is required to remove an electron from an atom which has table (half-filled or full filled) electronic configuration.
c and d. True. Due to penetration effect.
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Knowledge Check

  • Which of the following statement is // are correct ?

    A
    Average speed of a particle in a given time period is never less than magnitude of average velocity
    B
    it is possible to have situations in which`|(dvec(v))/(dt)|cancel(=) 0, "but" |(dvec(v))/(dt)|=0`
    C
    It is possible to have situations in which `(d|vecv|)/(dt)cencel=0 "but"|(dvec(v))/(dt)|=0`
    D
    the average velocity of a particle is zero in a time interval It is possible that the instantaneous velocity is never zero in the interval.

  • Which of the following statement is/are correct?

    A
    `[Ag(NH_(3))_(2)]^(+)` is linear with sp hybridised `Ag^(+)` ion.
    B
    `NiCl_(4)^(2-), VO_(4)^(3-)" and "MnO_(4)^(-)` have tetrahedral geometry.
    C
    `[Cu(NH_(3))_(4)]^(2+), [Pt(NH_(3))_(4)]^(2+)" and "[Ni(CN)_(4)]^(2-)` have `dsp^(2)` hybridisation of the metal ions.
    D
    `Fe(CO)_(5)` have trigonal bipyramidal structure with `dsp^(3)` hybridised iron.

  • which of the following statement is / are correct ?

    A
    the pH of `1.0xx10^(-8)` M solution of HCl is 8.
    B
    the cnjugate base of `H_(2)PO_(4)^(-)` is `HPO_(4)^(2-)`
    C
    Autoprotolysis constant of water decreases with temperature
    D
    when a solution of a weak monoprotic acid is titrated against a strong base , at half - neutralization point `pH= (1//2)pk_(a)`