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On adding NaOH to ammonium sulphate, a c...

On adding `NaOH` to ammonium sulphate, a colourless gas with pungent odour is evolved which forms a blue coloured complex with `Cu^(2+)` ion. Identify the gas.

Text Solution

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Ammonia `(NH_(3))`
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On heating copper turnings with conc. H_(2)SO_(4) , a colourless gas with pungent smell is evolved which decolourises acidified KMnO_(4) solution. Identify the gas.

Explain with reason the following: Cu^+ ion does not form coloured salts like Cu^(2+) ion.

Knowledge Check

  • Which of the following complexes formed by Cu^(2+) ions is most stable -

    A
    `Cu^(2+) +4NH_(3)hArr [Cu(NH_(3))_(4)]^(2+),logK=11.6`
    B
    `Cu^(2+)+4CN^(-)hArr [Cu(CN)_(4)]^(2-),logK=27.3`
    C
    `Cu^(2+)+2en hArr [Cu(en)_(3)]^(2+), logK=15.4`
    D
    `Cu^(2+)+4H_(2)OhArr [Cu(H_(2)O)_(4)]^(2+), logK=8.9`

  • The gas X is obtained on combustion of sulphide . It is a colourless gas with pungent , suffocating odour. It is harmful to our respiratory organs and is a constituent of acid rain. Its as . Solution is acids, it is a reducing agent and its acidis availble . X is -

    A
    `SO_(3)`
    B
    `H_(2)S`
    C
    `SO_(2)`
    D
    `CO_(2)`

  • When a compound A is heated, it produces a colourless gas and the residue obtained is dissolved in water to form the compound B. The compound C is formed when excess CO_2 is passed through aqueous solution of B. The compound C can be separated out in solid state from its solution. C in its solid state when heated forms the compound A. A is-

    A
    `CaCO_3`
    B
    `Na_2CO_3`
    C
    `K_2CO_3`
    D
    `CaSO_4.2H_2O`

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    When a mixture of K_(2)Cr_(2)O_(7) and NH_(4)Cl is heated , a colourless gas in evloved which is neither combustiible nor a supporter of combusion . However , Mg continued to burn in it. When the gas (A) is reacted with calcium carbide in it . When the gas (A) is reacted with calcium carbide in electric furnace , a solid (B) is obtained . (B) undergoes slow hydrolysis forming an insoluble compound (C) and the solution of the compound (D). (D) truns Nessle's reagent brown. Identify (A) to (D) . Write the reactions involved.

    A white solid (A) when heated liberates a colourless gas which does not support combustion. The residue is dissolved in water to form (B) which can be used for whitewashing. When excess of CO_2 gas is passed through the solution of (B), it gives a compound {C) which on heating forms (A). Identify (A), (B) and (C). Give the reactions.

    When dilute HCI is added to a white substance (A), a colourless gas (B) is evolved. When the gas (B) is passed through clear lime water, a white precipitate ( C) is obtained. The precipitate dissolves when excess of the gas (B) is passed through the lime water. The residue obtained on heating the solid substance (A) is yellow when hot but white when cold. When the gas (B) is passed through red hot charcoal, another gas (D) is obtained. The gas (D) gets absorbed in arnmoniacal cuprous chloride solution . Identify (A), (B), (C) and (D) and give the relevant reactions.

    An amorphous solid A burns in air to form a gas B which turns lime water milky . The gas is also produced during roasting of sulphide ore. This gas decolourises acidifed aqueous KMnO_(4) solution and reduces Fe^(3+) to Fe^(2+) . Identify the solid 'A' and the gas B and write the reactions involved .

    All such titration which involves the direct titration of iodine with a reducing agent are grouped under iodimetry. lodimetry is employed to determine the strength of reducing agent such as sodium thiosulphate I_2+Na_2S_2O_3rarrI^"-"+S_4O_6^"2-" If iodine is liberated as a result of chemical reaction involving oxidation of an iodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. Iodometry is used to estimate the strength of oxidizing agent. For example the estimation of Cu^"++" with thiosulphate. Cu^"++"+I^"-"rarr Cu_2I_2+I_2 I_2+S_2O_3^"2-"rarrS_4O_6^"2-"+I^- Starch used as indicator near the end point which form blue colour complex with I_3^- The blue colour disappears when there is no more of free l_2 . In the reaction 2CuSO_4+4KlrarrCu_2l_2_2K_2SO_4+l_2 the ratio of equivalent weight of CuSO_4 to its molecular weight is :

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