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Q. Define Elements and Compounds?
Pure substances are categorized into two categories that are elements and compounds. An element is a substance that can't be separated into simpler substances. Carbon, Oxygen, sulphur, aluminium, iron, and gold are elements. Above 110 elements are known but only 91 take place naturally on Earth. The residue have been created by scientists.
The first use of quantum theory to explain the structure of atom was made by: (1) Heisenberg (2 )Bohr (3) Planck (4) Einstein Ans: Bohr
why uranium235 and thorium232 dont participate in nuclear fission
Physical properties of dienes
Inductive effect - Relative reactivity of aldehydes and ketones The comparative re-activities of aldehydes and ketones in nucleophilic addition reactions might be attributed to
Why does lycopene absorb at loner wavelength than beta carotene though both have same number of double bonds?
ionic bonds are usually formed by combination of elements with which type of ionisation potential or electron affinity
Correct configuration of Fe +3 [26] is: (1) 1s 2 , 2s 2 , 2p 6, 3s 2, 3p 6 , 3d5 (2) 1s 2 , 2s 2, sp 6 , 3s 2 , 3p 6 , 3d 3 , 4s 2 (3) 1s 2 , 2s 2 , 2p
what is the relevance of half filled and completely filled orbitals in ionisation enthalphy ditermination
chemical properties of formic acid
Q. Define the Normality of solutions? Ans. Sometime normality is used to measure concentration. Normality (abbreviated N) is the number of gram-equivalent masses of solute in 1
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