Which of the following is strongest Bronsted base? from Chemistr

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Hybridisation in CH3, C+H3  and C-H3 are respectively

  • sp2, sp2, sp3

  • sp2, sp3, sp3

  • sp3, sp3, sp2

  • sp3, sp2, sp3


2.

Which of the following arrangements is possible?

  • n l m s
    5 2 2 +12
  • n l m s
    2 2 0 -12
  • n l m s
    3 -2 1 +12
  • n l m s
    0 0 1 +12

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3.

Which of the following is strongest Bronsted base?

  • ClO-

  • ClO2-

  • ClO3-

  • ClO4-


A.

ClO-

HClO4 is the strongest acid among HClO, HClO2, HClO3, and HClO4 as more the number of oxygen atoms attached, more is the acidity of the molecule order of acidity is :

HClO < HClO< HClO3 < HClO4

So the conjugate base order will be just reverse:

ClO- > ClO2- > ClO3- > ClO4-


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4.

In which of the following - bonding is possible?

  • CO32-

  • PO43-

  • NO3-

  • NO2-


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5.

Which of the following is always feasible?

  • H=TS

  • H(+ve), TS (-ve) and H >TS

  • H(-ve), TS (+ve) and H < TS

  • H(-ve), TS (-ve) and H >TS.


6.

Given that 

C + O2  CO2 ; H° =-a kJ.2CO + O2  2CO2 ; H° = -b kJ. 

The heat of formation of CO is 

 

  • b-2a

  • 2a-b2

  • b-2a2

  • 2a-b


7.

When the temperature of reactions will increase then the effect on pH value will

  • increase

  • decrease

  • first increases then decreases

  • remains same.


8.

Smallest intermolecular distance is found in

  • O2

  • O2+

  • O2-

  • O22-


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9.

The pH of aqueous solution ofammonium formate is (pKa of HCOOH = 3.8 and pKb of NH3= 4.8)

  • 7

  • 6.0

  • 6.5

  • 8.9


10.

dsp2 hybridisation is found in

  • [Ni(CN)4]2-

  • [CoCl4]2-

  • [CuCl4]3-

  • [CuCl4]2-


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