1 mole of photon, each of frequency 2500 s-1, would have approxim

Subject

Chemistry

Class

NEET Class 12

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1.

1 mole of photon, each of frequency 2500 s-1, would have approximately a total energy of

  • 10 erg

  • 1 J

  • 1 eV

  • 1 MeV


A.

10 erg

Frequency of one photon = 2500 s-1
:. Frequency of 1 mole of photon
               = 6.023 x 1023 x 2500 s-1

Total energy of 1 mol of photon, E=             = 6.626 × 10-34Js ×6.023 ×1023× 2500 s-1             = 9.97 × 10-7J 10 erg

 


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2.

The second law of thermodynamic says that in a cyclic process

  • work cannot be converted into heat

  • heat cannot be converted into work

  • work cannot be completely converted into heat

  • heat cannot be completely converted into work


3.

The equilibrium constant (K) of a reaction may be written as

  • K = e-G/RT

  • K =e-G°/RT

  • K = e-H/RT

  • K = e-H°/RT


4.

For the reaction  SO2 + 12O2  SO3 , if we write Kp = Kc(RT)x, then x become

  • -1

  • -12

  • 12

  • 1


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5.

Which of the following will decrease the pH of  a 50 mL solution of 0.01 M HCl?

  • Addition of 5 mL of 1 M HCl

  • Addition of 50 mL of 0.01 M HCl

  • Addition of 50 mL of 0.002 M HCl

  • Addition of Mg


6.

Equal volumes of molar hydrochloric acid 'and sulphuric acid are neutralized by dilute NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true ?

  • x = y

  • x =y/2

  • x = 2y

  • none of these


7.

Hybridisation of central atom in NF3 is

  • sp3

  • sp

  • sp2

  • dsp2


8.

For the Paschen series the values of n1 and nin the expression E =Rhc1n12-1n22 are

  • n1= 1, n2 = 2, 3, 4, ...

  • n1= 2, n2 = 3, 4, 5,...

  • n1= 3, n= 4,5,6,...

  • n1= 4, n2 = 5,6,7,...


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9.

Under which of the following conditions is the relation H =E + PV valid for a closed system ?

  • Constant pressure

  • Constant temperature

  • Constant temperature and pressure

  • Constant temperature, pressure and composition


10.

An organic compound made of C, H and N contains 20% nitrogen. Its molecular weight is

  • 70

  • 140

  • 100

  • 65


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