Q&A - Ask Doubts and Get Answers

Clear All
It has been difficult to study the chemistry of radon because radon is a radioactive element and it has a short half-life.
 Helium is used in diving apparatus because it is very low soluble in blood.
ICl is more reactive than . this is because interhalogen compounds are more reactive than halogens (except fluorine). This is because X–X′ bond in interhalogens is weaker than X–X bond in halogens except F–F bond. 
The poisonous gases which we can be prepared from chlorine are phosgene ()  mustard gas .
Chlorine is a powerful bleaching agent and its bleaching action happens due to oxidation. Chlorine + Water    Hydrochloric acid + nascent Oxygen Coloured substance + nascent Oxygen  Colourless substance
The water of the sea contains bromides, chlorides, and iodides of sodium, magnesium, potassium and calcium, but mainly solution of sodium chloride (2.5% by mass). The deposits of dried up seas have these compounds in it, e.g., sodium chloride and carnallite, KCl.MgCl2 .6H2O. iodine is also formed in   Certain forms of marine life in their systems; many seaweeds, for example, contain up to 0.5%...
We see anomalous behaviour of fluorine and this is because of its small size, highest electronegativity, very low F-F bond dissociation enthalpy, and non-availability of d orbitals in the valence shell. 1. ionisation enthalpy, electronegativity, and electrode potentials are all higher for fluorine than expected from the trends set by other halogens 2.ionic and covalent radii, melting point and...
 is much more powerful in oxidising, than .The reason being, hydration enthalpy of F– ions (515 kJ mol–1) is much higher than that of Cl– ion (381 kJ mol–1). the dissociation energy of bond  F-F is less than Cl-Cl bond but The former factor more than compensate the less negative electron gain enthalpy of F2. Hence it is a much stronger oxidising agent.
 is a very strong acid in water mostly due to its first ionisation to  and .The ionisation of  to  and is minuscule. That is the reason why Ka2 << Ka1.
Contact process which we use to create sulphuric acid is exothermic, reversible and the forward reaction which leads to a decrease in volume. hence, low temperature and high pressure are the optimum conditions for maximum yield. But if the temperature will be very low then the rate of reaction will become slow. Also, the presence of catalyst  fastens the reaction.
Manufacture of fertilisers (e.g., ammonium sulphate, superphosphate) from . Use is petroleum refining Manufacture of pigments, paints and dyestuff intermediates and detergent industry.
Presence of sulphur dioxide is measured by the following reaction. it decolourises acidified potassium permanganate(VII) solution. . it decolourises acidified potassium permanganate(VII) solution. Hence This can be used to detect the presence of .
The two   bonds  in molecule are covalent and have equal strength because of having resonating structures.
When we pass sulphur dioxide  through an aqueous solution of Fe(III) salt, it converts iron(III) ions to iron(II) ions.
A quantitative method for estimating O3 gas is: When we reacts  with an excess of potassium iodide solution which is buffered with a borate buffer (pH 9.2), iodine is released which can be then titrated against a standard solution of sodium thiosulphate.  we use starch as an indicator when    liberated is titrated against a standard solution of sodium thiosulphate.
   act as a powerful oxidising agent .This is because of the ease with which it frees atoms of nascent oxygen.i.e.                 
Since Platinum(Pt)  is a noble metal .it will not react with oxygen directly
Exams
Articles
Questions