(B) When a salt containing iodide ions $(I^{-})$ is treated with concentrated $H_2SO_4$,it produces hydrogen iodide $(HI)$.$HI$ is a strong reducing a

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(B) When a salt containing iodide ions $(I^{-})$ is treated with concentrated $H_2SO_4$,it produces hydrogen iodide $(HI)$.$HI$ is a strong reducing agent and is further oxidized by concentrated $H_2SO_4$ to produce iodine $(I_2)$ vapors,which are violet in color.The reaction is: $2I^{-} + 2H_2SO_4 \rightarrow I_2 + SO_2 + 2H_2O + SO_4^{2-}$.Thus,the presence of violet vapors indicates the presence of $I^{-}$ ions.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Acid Radical

Medium

$A$ salt gives violet vapours when treated with concentrated $H_2SO_4$,it contains

A
$Cl^{-}$
B
$I^{-}$
C
$Br^{-}$
D
$NO_3^{-}$

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Principles Related to Practical Chemistry

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Wet Test for Acid Radical

Which of the following is correctly matched?

Medium

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Chromyl chloride vapours are dissolved in $NaOH$ and acetic acid and lead acetate solution is added,then

Difficult

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When $BaCl_2$ is added to a clear solution of compound $(X)$,a heavy white precipitate is formed,which is insoluble in dilute $HCl$. What is compound $(X)$?

Easy

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$A$ solution of a salt in dilute $H_2SO_4$ gives a blue color with starch iodide solution. This indicates the presence of which ion?

Medium

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Match List-$I$ with List-$II$:

List-$I$ (Anion) List-$II$ (Gas evolved on reaction with dil. $H_2SO_4$)

$A. CO_3^{2-}$ $I$. Colourless gas which turns lead acetate paper black

$B. S^{2-}$ $II$. Colourless gas which turns acidified potassium dichromate solution green

$C. SO_3^{2-}$ $III$. Brown fumes which turn acidified $KI$ solution containing starch blue

$D. NO_2^{-}$ $IV$. Colourless gas evolved with brisk effervescence,which turns lime water milky

Choose the correct answer from the options given below:

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List-$I$ (Anion)	List-$II$ (Gas evolved on reaction with dil. $H_2SO_4$)
$A. CO_3^{2-}$	$I$. Colourless gas which turns lead acetate paper black
$B. S^{2-}$	$II$. Colourless gas which turns acidified potassium dichromate solution green
$C. SO_3^{2-}$	$III$. Brown fumes which turn acidified $KI$ solution containing starch blue
$D. NO_2^{-}$	$IV$. Colourless gas evolved with brisk effervescence,which turns lime water milky

$A$ salt gives violet vapours when treated with concentrated $H_2SO_4$,it contains

Similar Questions

Which of the following is correctly matched?

Chromyl chloride vapours are dissolved in $NaOH$ and acetic acid and lead acetate solution is added,then

When $BaCl_2$ is added to a clear solution of compound $(X)$,a heavy white precipitate is formed,which is insoluble in dilute $HCl$. What is compound $(X)$?

$A$ solution of a salt in dilute $H_2SO_4$ gives a blue color with starch iodide solution. This indicates the presence of which ion?

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