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Chrome iron ore (x) was heated with dry ...

Chrome iron ore (x) was heated with dry `Na_(2)CO_(3)` in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. `H_(2)SO_(4)` turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, `NH_(4)Cl` was added. On fractional crystallization, orange red crystals (C ) is formed.
'C' on heating gave

A

`NH_(3)` as a titrant and B as indicator

B

`N_(2)`

C

`NO_(2)`

D

`CO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(NH_(4))_(2)Cr_(2)O_(7)rarrN_(2)+4H_(2)O +Cr_(2)O_(3)`
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Chrome iron ore (x) was heated with dry Na_(2)CO_(3) in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. H_(2)SO_(4) turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, NH_(4)Cl was added. On fractional crystallization, orange red crystals (C ) is formed. Quick lime is added during heating because

Chrome iron ore (x) was heated with dry Na_(2)CO_(3) in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. H_(2)SO_(4) turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, NH_(4)Cl was added. On fractional crystallization, orange red crystals (C ) is formed. When alkali is added to B, the species formed is

Knowledge Check

  • Chrome iron ore (x) was heated with dry Na_(2)CO_(3) in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. H_(2)SO_(4) turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, NH_(4)Cl was added. On fractional crystallization, orange red crystals (C ) is formed. A is used in the

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    B
    flux
    C
    water softner
    D
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  • Chrome iron ore (x) was heated with dry Na_(2)CO_(3) in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. H_(2)SO_(4) turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, NH_(4)Cl was added. On fractional crystallization, orange red crystals (C ) is formed. Compound (B) will be

    A
    NaCl
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  • Chrome iron ore (x) was heated with dry Na_(2)CO_(3) in the presence of quick lime and air in a furnace. The mixture was extracted with water and filtered. The filtrate was yellow(A) which on adding conc. H_(2)SO_(4) turned to orange red. The solution was evaporated and cooled. The crystals of B were obtained. To the crystals in aqueous solution, NH_(4)Cl was added. On fractional crystallization, orange red crystals (C ) is formed. B was obtained by fractional crystallization. The compound crystallized first was

    A
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    B
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    C
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