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Comprehension # 4 A monobasic acid of...

Comprehension # 4
A monobasic acid of weight `15.5 g` is heated with excess of oxygen `&` evolved gases when passed through KOH solution increased its weight by `22 g` and when passed through anhydrous `CaCl_(2)`, increased its weight by `13.5 g`. When the same mass of this organic acid is reacted with excess of silver nitrate solution form `41.75 g` silver salt of the acid which on ignition gave the residue of weight `27 g`.
The molecular formula of the organic acid is.

A

`C_(2)H_(6)`

B

`C_(2)H_(5)O_(2)`

C

`C_(2)H_(6)O_(2)`

D

`C_(2)H_(4)O`

Text Solution

Verified by Experts

The correct Answer is:
C
`CO_(2)=22g=0.5mol`
`H_(2)O = 13.5g =(13.5)/(18)`mol
`C=0.5` mol `= 6 g`
`H = 1.5` mol `= 1.5 g`
`O = 8 gm = 0.5` mol
`E.F. = CH_(3)O`
let molar mass ` = M`
`(27)/(108) = (41.75)/(M-1+108)`
`implies M=-107+167=60`
`E.F`. mass `=12+3+16=31`
`n = (274)/(31) ~~ 2`
`M.F. = (CH_(3)O)_(2)`
`=C_(2)H_(6)O_(2)`
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Knowledge Check

  • Comprehension # 4 A monobasic acid of weight 15.5 g is heated with excess of oxygen & evolved gases when passed through KOH solution increased its weight by 22 g and when passed through anhydrous CaCI_(2) , increased its weight by 13.5 g . When the same mass of this organic acid is reacted with excess of silver nitrate solution form 41.75 g silver salt of the acid which on ignition gave the residue of weight 27 g . The molar masses of the acid & its silver salt repectively are :

    A
    `60,168`
    B
    `167,60`
    C
    `60,167`
    D
    `168,60`

  • When 0.01 mole of a cobalt complex is treated with excess of silver nitrate solution 4.035 g of silver chloride is precipitated. The formula of the complex is :

    A
    `[Co(NH_(3))_(3)Cl_(3)]`
    B
    `[Co(NH_(3))_(5)Cl]Cl_(2)`
    C
    `[Co(NH_(3))_(6)]Cl_(3)`
    D
    `[Co(NH_(3))_(4)Cl_(2)]NO_(3)`

  • When 0.01 mole of a cobalt complex is treated with excess silver nitrate solution, 4.305 g silver chloride is precipitated. The formula of the complex is

    A
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    B
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    C
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    D
    `[Co(NH_(3))_(4)Cl_(2)]NO_(3)`

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