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A photon of 400 nm is absorbed by a gas and re-emits two photons. One re-emitted photon has wavelength 500 nm the other photon has wavelength of
Among the following the maximum covalent character is shown by the compound
Higher the positive oxidation state higher will be the covalent character.
Hence, option C is correct.
Which of the following compounds is not an antacid?
Phenelzine is tranquilizer. It is not an antacid.
Hence, option C is correct
The ionic radii (in Å) of N3-, O2- and F- are respectively :
These are isoelectronic species as the number of electrons present in all species = 10 electrons. As negative charge increases,size of the ions increases and ionic radius increases. Hence, option C is correct.
Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?
It is an inner orbital complex as the d-orbital involved in hybridization belongs to penultimate shell. Hence, option C is correct.
Match the catalysts to the correct processes :
Catalyst Process
(A) TiCI3 (i) Wacker process
(B) PdCI2 (ii) Ziegler - Natta polymerization
(C) CuCI2 (iii) Contact process
(D) V2O5 (iv) Deacon's process
Hence, option B is correct
Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason : The reaction between nitrogen and oxygen requires high temperature.
Assertion is true because it is an observation that nitrogen being highly stable does not react with oxygen in atmosphere. The reaction to form oxides of nitrogen takes place at higher temperature (≈ 2000 K). So, reason is correct and also the correct explanation of the assertion. Hence, option A is correct
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?
(1) In this process, carbon anode is oxidised to CO and CO2. (2) It is a fact (3) At cathode, Al3+ from Al2O3 is reduced to Al. (4) Al2O3 is the electrolyte, which is undergoing the redox process. So, Al2O3 serves as electrolyte and Na3AIF6, although an electrolyte, serves as solvent. Hence, option D is correct
The equilibrium SO2Cl2(g) SO2(g) + Cl2(g) is attained at 25ïC in a closed container and inert gas helium is introduced. Which of the following statement(s) is /are correct? A. concentration of SO2, Cl2 and SO2Cl2 change B. more chlorine is formed C. concentration of SO2 is reduced D. more SO2Cl2 is formed
When inert gas is added at constant volume, there is no effect on equilibrium. Hence, none of the options is correct answer.
The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction, is
CH3Cl is a primary halo alkane and therefore will have a back side attack.
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