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On heating a mixture of common salt and \( \text{K}_{2}\text{Cr}_{2}\text{O}_{7} \) in equal amount along with concentrated \( \text{H}_{2}\text{SO}_{4} \) in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:

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Consider three metal chlorides \( x \), \( y \) and \( z \), where \( x \) is water soluble at room temperature, \( y \) is sparingly soluble in water at room temperature and \( z \) is soluble in hot water. \( x \), \( y \) and \( z \) are respectively:

\( \mathrm{HA(aq)} \rightleftharpoons \mathrm{H^+(aq)} + \mathrm{A^{-}(aq)} \)
The freezing point depression of a \( 0.1 \, \text{m} \) aqueous solution of a monobasic weak acid \( \mathrm{HA} \) is \( 0.20^\circ \text{C} \). The dissociation constant for the acid is: [Given: \( K_f(\mathrm{H_2O}) = 1.8 \, \text{K kg mol}^{-1} \), molality \( = \) molarity]

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Which of the following nitrogen containing compound does not give Lassaigne’s test?

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Compounds that should not be used as primary standards in titrimetric analysis are:
(A) \( \text Na_{2}Cr_2O_7 \)
(B) Oxalic acid
(C) \( \text{NaOH} \)
(D) \( \text FeSO_4 . 6H_2O \)
(E) Sodium tetraborate
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The correct statement among the following, for a “chromatography” purification method is:

In sulphur estimation, \( 2.0 \times 10^{-3} \) mol of an organic compound \( (X) \) \( (\text{molar mass } 76 \, \text{g mol}^{-1}) \) gave \( 0.4813 \, \text{g} \) of barium sulphate \( (\text{molar mass } 233 \, \text{g mol}^{-1}) \). The percentage of sulphur in the compound \( (X) \) is ______ \( \times 10^{-1}\% \).
(Nearest integer)

Given below are two statements:
Statement I : Retardation factor ($R_f$) can be measured in meter / centimeter. 
Statement II :$R_f$ value of a compound remain constant in all solvents. 

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Match List-I with List-II.

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Match List-I with List-II.

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