Species characteristics that make them less prone to extinction are listed below:

A. Narrow niche and specialized

B. High dispersal power

C. High trophic status

D. Long life span

Which of the following is the correct combination?

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#Question id: 20041

#XL - P Chemistry

How many electrons in K (Z=19) have n=4 and 

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#Question id: 20042

#XL - P Chemistry

Suggest two transitions in hydrogen spectrum for which wave number ratio is 108:7

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#Question id: 20045

#XL - P Chemistry

The ratio of K.E. to P.E. of an electron in Bohr orbit of H like species is

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#Question id: 20046

#XL - P Chemistry

For particles having same KE., the de-broglie wavelength is

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#Question id: 20047

#XL - P Chemistry

In one joule of energy, the number of photon with wave number equal to is

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#Question id: 20048

#XL - P Chemistry

Which of the expression given below gives IE of H atoms in terms of Rydberg’s constant (RH)?