Concentratged H(2)SO(4) is not used to p...

Concentratged `H_(2)SO_(4)` is not used to prepare HBr from KBr becaue it

Oxidizes HBr

Reduces HBr

Causes disproportionation of HBr

Reacts too slowly with KBr

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Passage-II : Sulphuric acid is considered as the king of chemicals. The prosperity of any country is measured by the amount of sulphuric acid it consumes. Sulphuric acid is, thus a substance of very great commercial importance as it is used practically in every important industry. This is due to the following properties of sulphuric acid Concentrated H_(2)SO_(4) cannot be used to prepare HBr or HI from KBr or KI because it :

H_(2)SO_(4) is used in

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An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCI in cold conditions. B is soluble in boiling water. An aqueous solution of A gives a yellow precipitate on treatment with a solution of K_(2)CrO_(4) . The soda extract of A is acidified with dilute H_(2)SO_(4) boiled to remove CO_(2) and treated with a freshly prepared solution of FeSO_(4) Concentrated H_(2)SO_(4) is added to the resulting solution (along the walls of the test tube so that the H_(2)SO_(4) forms a separate layer). A brown ring is formed at the junction of the two layers. On treatment with a Kl solution, an aqueous solution of A will give

(A) H_(2) SO _(4) is used in the preparation of HCl from NaCl (R ) H _(2) SO _(4) is lower volatile cid than HCl

H_(2)SO_(4) reacts with sugar and acts as

In esterification , concentrated H_(2) SO_(4) acts as

Aluminium reacts with concentrated H_(2)SO_(4) to liberate SO_(2) gas. In this process, the clement in H_(2)SO_(4) that has changed its oxidation state is

AAKASH SERIES-REVISION EXERCISE -VIA GROUP ELEMENTS

In the preparation of H(2) SO(4), by Constact process V (2) O(5) is u...
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Which statement is correct ?
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Which gas is used to imporve the atmosphere of crowded places ?
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Ozonization of water is carried out to remove
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C(12) H (12) O (11) overset(H(2) SO (4)) to H (2) O + A overset( H (2)...
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All of the following decompose easily on heating to give O(2) except
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In the preparaiton of O2 from KClO3, MnO2 acts as
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Oxygen is liberated from water using
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The gases absorbed by alkaline pyrogallol and turpentine oil respectiv...
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Regarding oxygen the correct statements are A) It is an important co...
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Concentratged H(2)SO(4) is not used to prepare HBr from KBr becaue it
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Most acidic oxide in group VI is formed by
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The element which evolves two gases on reacting with conc. H(2)SO(4) i...
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H(2)SO(4) has very corrosive action on skin because
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A student accidently splashes few drops of conc. H,SO, on his cotton s...
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Sulphuric acid is used A) In petroleum refining B) In galvanising ...
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Which reaction represents the oxidizing behaviour of H(2)SO(4) ?
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Which substance chars when warmed with conc. H2SO4 ?
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HCOOH reacts wihth conc. H(2)SO(4) to produce
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Ozone oxidises iodide to
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