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Versatile nature of Carbon-Catenation The chemical compounds can be mainly classified into two main categories. These are organic and inorganic. More than 90 elements are in
1. Write an easy on the classification of Phylum Protozoa, a large phylum comprising approximately 50,000 species. (10marks)
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define hardness and its types.
The value of Planck's constant is 6.63x 10 -34 Js. The velocity of light is 3.0x 10 8 ms -1 . Which value is closest to the wavelength in nanometres of a quantum of light with
A covalent bond between two atoms is formed by which of the following: (1) Electron nuclear attraction (2) Electron sharing (3) Electron transfer (
The energy of a photon is calculated by: (1) E= hv (2) h= Ev (3) h = E/v (4) E= h/v Ans: E= hv
The frequency corresponding to transition n= 2 to n =1 in hydrogen atom is: (1) 15.66 x 10 10 Hz (2) 24.66 x 10 14 Hz (3) 30.5
The difference among Threshold energy and average energy of the molecules is known as activation energy.
The electronic structure of four elements A, B, C, D are: (1) 1s 2 (2) 1s 2 , 2s 2, 2p 2 , (3) 1s 2, 2s 2 , 2p 5 ,
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