Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not . An aqucous solution which is sightly acids contains cattions `Fe^(2+),Zn^(2+) and Cu^(2+)`. THe rengent added in excess to this solution would identify the separate `Fe^(2+)` ion in one step isA. `2M HCI`B. `6M NH_(3)`C. `6M NaOH`D. `H_(2)S gas `

Cations are classified into varius group on the basis of their behavio

1.	Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not . An aqucous solution which is sightly acids contains cattions `Fe^(2+),Zn^(2+) and Cu^(2+)`. THe rengent added in excess to this solution would identify the separate `Fe^(2+)` ion in one step isA. `2M HCI`B. `6M NH_(3)`C. `6M NaOH`D. `H_(2)S gas `
Answer» Correct Answer - b `Fe^(3+) + 3NH_(4)OH rarr Fe(OH)_(3) darr ("reddish brown") +3NH_(4)^(o+)` `Cu^(2+) + 4NH_(3) rarr underset(("blue colour soluble complex"))([Cu(NH_(3))_(4)]^(2+))` ` Zn^(2+) + 4NH_(3) rarr underset(("colourless soluble complex"))([Zn(NH_(3))_(4)]^(2+))`

Discussion

No Comment Found

Related InterviewSolutions

Identify (A) to (G) in the following scheme and name the process. `CaCO_(3) overset(Delta) to (A) + (B) gas , (A) + H_(2)O rarr (C )` `(C )+B rarr CaCO_(3) + H_(2)O (D) +(C ) overset(Delta) to (E ) gas` `(E ) + H_(2)O + (B) rarr (F) , NaCI + (F) rarr (G) + (D)` `(G) overset(Delta) to Na_(3)CO_(3) + H_(2)O + (B)`
Select the correct statement(s):A. Normal and polysulphides of ailkali metals are soluble in waterB. The sulphides of aluminum and magnesium can only be prepared under dry condition as they are completely hydroysed by waterC. When filter paper is moistened with a solution of sodium miropressium made alkline with sodium hydroxide or ammonia solution , a purple colouration is produced with free hydrogen sulphideD. Thiosulphate salt of `Pb,Ag and Ba ` are insoluble and dissolve in excess of sodium thisulphide solution forming thiosulphde.
Colourless salt (A) gives apple- green flame with cone. `HCI` (A) on reaction with dil `H_(2)SO_(4)` give light brown flame (D) turning KI -strach paper blue. (A) `+ CH_(3)COOH + K_(2)CrO_(4) rarr` yellow ppt (B) (A) `+ H_(2)SO_(4) rarr (C ) ("white ppt") + (D)` (D) `+ CH_(3)NH_(2) + CH_(3)OH + H_(2)O + gas (E )` (E ) `+ Mg overset(Delta)to (F)` (F) `+ H_(2)O rarr NH_(3)` Identify (A) to (F) and explain reaction.
Which gives violet colour with borax ?A. `NH_(4)^(o+)`B. `K^(o+)`C. `Mg^(2+)`D. `Al^(3+)`
Colourless salt `(X) overset(Delta) to (Y) overset(Cu^(2+),Delta) to` coloured head (Z) ,(X) can beA. BoraxB. Microcostric saltC. Copper sulphateD. None of these
A green mass is formed in the charcoul cavity test when a colourless salt `(X)` is fussed with chbalt mitrate (X) may containA. AluminiumB. copperC. BariumD. Zine
A solution of colourless salt H on holing with excess `NaOH` produces a non-flammable gas .The gas evolution ceses after sometime. Upon addition of `Zn` dust to the same solution the gas evolution restarts .The colourless salt(s) H is (are)A. `NH_(4)NO_(3)`B. `NH_(4)NO_(2)`C. `NH_(4)CI`D. `(NH_(4))_(2)SO_(4)`
Microcosmic salt bent test in which `Na(NH_(4))H. PO_(4). 4H_(2)O` is first doydrated which forms sodium metaposphate `(NaPO_(2))` as colourless head which reacts with metals oxide giving coloured head .This test is solable is soluble for Cu,Cr and Co .The blue heated with `CuO` and ` CoO` are due the formation of ____and ___white green head with `Cr_(2)O_(3)` is due to the formation of ____.
Th esodium carbobate bead test test is which `Na_(2)CO_(3)` is along instead of barax it is solution to chromiam and ____.
Why do we not perform borax bead test with the white salt?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment