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New answer posted
5 months ago
Contributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(i) The reaction follows Markovnikov's rule leading to giving 2o carbocation as an intermediate.
New answer posted
5 months agoContributor-Level 10
Limitations of Bohr's model of an atom:
(i) It could not explain spectrum of multi-electron atoms.
(ii) It could not explain Zeeman and Stark effects.
(iii) It could not explain shape of molecules.
(iv) It was not in accordance with Heisenberg's uncertainty principle.
Quantum Mechanical Model: It was developed on the basis of Heisenberg's uncertainty principle and dual behaviour of matter.
Main features of this model are given below:
(i) The energy of electrons in an atom is quantized i.e. can only have certain values.
(ii) The existence of quantized electronic energy levels is a direct result of the wave like properties of electro
New answer posted
5 months agoContributor-Level 10
Similarities:
(i) Both have spherical shape.
(ii) Both have same angular momentum.
Differences:
(i) 1s has no node while 2s has one node.
Energy of 2s is greater than that of 1s.
New answer posted
5 months ago
Contributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(i) 3, 6 – Diethyl – 2 – methyl octane
Octane is the longest chain here and the side chain follows the lowest sum rule.
New question posted
5 months agoNew answer posted
5 months agoContributor-Level 10
Since ordinary white light consists of waves with all the wavelengths in the visible range, a ray of white light is spread out into a series of coloured bands called spectrum. The light of red colour which has the longest wavelength is deviated the least while the violet light, which has the shortest wavelength, is deviated the most.
The spectrum of white light, that we can see, ranges from violet at 7.50 * 1014 Hz to red at
4*1014 Hz. Such a spectrum is called a continuous spectrum (Continuous because violet merges into blue, blue into green and so on). A similar spectrum is produced when a rainbow forms in the sky.
The emission spectra
New answer posted
5 months agoContributor-Level 10
An ideal body, which emits and absorbs radiations of all frequencies uniformly, is called a black body and the radiation emitted by such a body is called black body radiation. In practice, no such body exists. Carbon black approximates fairly closely to black body. A good physical approximation to a black body is a cavity with a tiny hole, which has no other opening. Any ray entering the hole will be reflected by the cavity walls and will be eventually absorbed by the walls.
New answer posted
5 months agoContributor-Level 10
Werner Heisenberg a German physicist in 1927, stated uncertainty principle which is the consequence of dual behaviour of matter and. It states that it is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of an electron.
It rules out existence of definite paths or trajectories of electrons and other similar particles.
New answer posted
5 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(ii) R–Cl< RBr < RI
The reduction of alkyl halides depends upon the C-X bond strength i.e. lesser the bond strength higher will be the reactivity of alkyl halide. As down the group size of the halogens increases thus the bond strength decreases.
New answer posted
5 months agoContributor-Level 10
The chemical properties of an atom are controlled by the number of electrons in the atom, which remains the same despite the change or variation in atomic masses in case the of isotopes.
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