A reddish positive charged sol is obtained by adding small quantity of `FeCl_(3)` solution to freshly prepared and well washed `Fe(OH)_(3)` precipitate. How does it take place?
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A solution of glycerol `(C_(3)H_(8)O_(3))` with mlar mass =92 g `mol^(-1)` in water was prepared by dissolved some glycerol in 500 g of water. The sol
Correct Answer - 37.7 g `DeltaT_(b)=(100.42^(@)C-100)^(@)C=0.42^(@)C=0.42" K",` `M_(B)=92" g mol"^(-1),W_(A)=500 g =0.5" kg",` `K_(b)=0.152" k kg mol"^(-1)` `W_(B)=(M_(B)xxDeltaT_(b)xxW_(A))/(K_(b))=((92g mol^(-1))xx(0.42K)xx(0.5kg))/((0.512" k kg mol"^(-1)))=37.7 g`.
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The clouds consist of charged particles of water dispersed in air.Some of them are +vely charged, others are -vely charged.When +vely charged clouds c
Correct Answer - A `AgNO_3("excess")+KItoAgloverset(+AgNO_3("remaining"))to Agl//Ag`
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Match the colour of precipitate listed in column-I with the reagent(s) listed in column II. `{:(Column-I,Column-II),((A)Bi^(3+)"gives black precipitat
Correct Answer - A`to`p,r ; B`to`p,q ; C`to`p,s ; D`to`q,s,t (A)`2Bi^(3+)+3H_2StoBi_2S_3darr(black)+6H^(+)` `Bi^(3+)to3I^(-)toBiI_3darr` (black) (B)`Cu^(2+)+H_2StoCuSdarr(black)+2H^(+)` `Cu^(2+)+2SCN^(-)toCu(SCN)_2darr`(black) which one standing slowly changes to white `2Cu(SCN)_2to2Cu(SCN)darr(white)+(SCN)_2` `Cu_2I_2` is white precipitate and `Cu_2[Fe(CN)_6]` brown precipitate...
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`50mL` of `0.05M` Propane `-1,2-`diamine solution is titrated with `0.1M HCl` solution at `25^(@)C`. Detemine the `pH` of solution obtained by adding
(a) Half neutralisation :`pH=pK_(a_(1))=14-4.18=9.82` (b)`pH=((pK_(a_(1))+pK_(a_(2)))/(2))=(14-4.18+14-7.39)/(2)=8.215` (c ) Buffer: `pH=14-7.39+log((2.5-0.5)/(0.5))=7.21`
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Solution of alkali metal cyanide containing freshly prepared ion `(II)` sulphate solution and dilute `H_(2)SO_(4)` on exposure to air produces prussia
Correct Answer - 1 `Fe^(2+)+2 CN^(-) toFe(CN)_(2)darr,Fe(CN)_(2)darr+4CN^(-)to[Fe(CN)_(6)]^(4-)` `4Fe^(2+)+O_(2)+4H^(+)to4Fe^(3+)+2H_(2)O,Fe^(3)+[Fe(CN)_(6)]^(4-)toFe_(4)[Fe(CN)_(6)]_(3)darr`
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A one litre flask is full of reddish brown bromine fumes.The intensity of brown colour of vapour will not decrease appreciably on adding to the flask
Correct Answer - A Marble `(CaCO_(3))` do not react, adsorb, absorb, or dissolve `Br_(2)`.As such there is no change is colour of `Br_(2)`. Remaining dissolves or absorb or adsorb bromine.
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When negatively charged colloids like `As_(2)S_(3)` sol is added to positively charged `Fe(OH)_(3)` sol in suitable amounts :
Correct Answer - A::B Positive and negative sol will precipitate each other.
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The clouds consist of charged particles of water dispersed in air. Some of them are +vely charged, other are -vely charged. When +vely charged clouds
Correct Answer - A `AgNO_(3)("excess")+KI rarr Agl overset(+AgNO_(3) ("remaining"))(rarr)AgI//Ag^(+)`
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A sample of hyrdazine sulphate `(N_(2)H_(6)SO_(4))` was dissovled in 100ml 10ml of this solution was reacted with excess of `FeCl_(3)` solution and wa
`N_(kmNo_(4))=(20)/(1000)xx(1)/(50)` `n_(Fe^(+2))xxn_(KMnO_(4))` `=5xx(20)/(1000)xx(1)/(50)=0.002` `n_(N)_(2)H_(4))` is 10 ml `=(1)/(4) n_(Fe^(+2))=(0.002)/(4)` `n_(N_(2)H_(4))` is 1L`=(0.002)/(4)xx100=(0.2)/(4)` mass of `N_(2)H_(6)SO_(4)` in `1L=(0.2)/(4)xx130=6.5gm`
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