Chemistry
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New answer posted
10 months agoContributor-Level 10
(A) Concentration of Ag & Au done by NaCN. It is known as Mac Arthur Process (cyanide process)
(B) Blast furnace produces pig Fe.
(C) Blister Cu → Reverberatory furnace. In this furnace smelting & roasting of ore take place
CuFeS? + O? → Cu? O + FeO
(D) Froth floatation process is used for concentration of sulphide ores.
New answer posted
10 months agoContributor-Level 10
Polyamide copolymers are biodegradable polymers.
Polymers Nylon-2 Nylon-6 are polyamides and monomers of Nylon-2 nylon-6 are:
H? N–CH? –COOH (Glycine) & H? N– (CH? )? –COOH (Aminocaproic acid)
New answer posted
10 months agoContributor-Level 10
Bohr's model played an important role in the development of quantum theory. It introduced the idea of quantised electron orbits. It disproved claims of classical mechanics, which predicted that electrons would spiral into the nucleus. Bohr proposed that electrons can exist only in specific, stable energy levels called stationary states. There would be transitions between these levels that would help Bohr explain the line spectra of hydrogen. That together linked the atomic structure with the concept of energy quantisation. Even though the model could not explain multi-electron atoms, it laid the foundation for modern quantum mechanics.
New answer posted
10 months agoContributor-Level 10
The existence of atomic spectra tells us that energy levels in atoms are quantised. When atoms absorb or emit light, they do so at specific wavelengths. They lead to line spectra instead of a continuous spectrum. Now, every line corresponds to an electron that transitions between fixed energy levels. This is to make the photon's energy equal to the difference between them. If energy levels were not discrete, the spectra would be continuous. So, the line spectra provide direct evidence that electrons in atoms occupy quantised energy states.
New answer posted
10 months agoContributor-Level 10
Metal of group 7, 8, & 9 dose not form interstitial hydride this is called hydride gap.
Mn → group - 7
Fe → group - 8
Co → group - 9
So, Cr will forms interstitial hydride.
New answer posted
10 months ago
Contributor-Level 10
Conjugate base is highly stable.
Acidic strength ∝ stability of conjugate base.
So, 
New answer posted
10 months ago
Contributor-Level 10
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