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40 gm of a carbonate of an alkali metal ...

40 gm of a carbonate of an alkali metal or alkaline earth metal containing some insert impurities was made to react with excess HCl solution. The liberated `CO_(2)` occupied 12.315 lit. at 1 atm & 300 K . The correct option is

A

Mass of impurity is 1 gm and metal is Be

B

Mass of impurity is 3 gm and metal is Li

C

Mass of impurity is 5 gm and metal is Be

D

Mass of impurity is 2 gm and metal is Mg

Text Solution

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The correct Answer is:
B
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A sample of calcium carbonate is 80% pure, 25 gm of this sample is treated with excess of HCl .How much volume of CO_(2) will be obtained from at 1 atm & 273 K ?

4.2 gm of carbonate of an alkaline earth metal is dissolved in excess of HCl solution by which 1.12L CO_(2) gas (measured at 273K and 1 atm) is evolved. If the pure metal crystallises as BCC crystal, then the only correct statement regarding the metal is: [N_(A) = 6 xx 10^(23)]

Knowledge Check

  • 40 gm of a carbonate of an alkali metal or alkaline earth metal containg some insert impurities was made to react with excess HCl solution. The liberated CO_(2) occupied 12.315 litre at 1 atm and 300K. The corrrect option is:

    A
    Mass of impurity of 1gm and metal is Be
    B
    Mass of impurity is 3gm and metal is Li
    C
    Mass of impurity is 6gm and metal is Li
    D
    Mass of impurity is 2gm and metal is Mg

  • Alkali and alkaline earth metals along with hydrogen and helium constitute s-block elements . They have low ionization enthalpies and hence exhibit characteristic flame colouration . They have highly negative electrode potentials and hence are strong reducing agents . Their solutions in liquid ammonia are conducting and also act as strong reducing agents than hydrogen , they are usually prepared by electrolysis of their fused chlorides . Their oxides are basic and the basic strength increases down the group . The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends . The carbonates of alkaline earth metals and lithium carbonate decompose on heating while the carbonates of other alkali metals do not decompose on heating . The bicarbonates of both alkali and alkaline earth metals on heating give carbonates . The basic character of the oxides , MgO , SrO , K_(2)O , NiO and Cs_(2)O increases in the order :

    A
    `MgO gt Sr O gt K_(2)O gt NiO gt Cs_(2)`
    B
    `Cs_(2) lt K_(2)O lt MgO lt SrO lt NiO`
    C
    `NiO lt MgO lt SrO lt K_(2)O lt Cs_(2)O`
    D
    `K_(2)O ltNiO lt MgO lt SrO lt Cs_(2)`

  • Air sample from an industrial town, heavily polluted by CO_(2) was collected and analyzed . In one anaylsis , 56L of air measured at 1 atm and 273 K was passed through a 250 mL of 0.025 M NaOH solution , where CO_(2)(g) was absorbed completely . 25 mL of the above solution was then treated with excess of BaCl_(2) solution where all the carbonate was precipitated as BaCo_(3)(s) . The solution was filtered off and the filtrate required 25 mL of a 0.005 MHCl solution for neutralization. Weight (in milligrams ) of precipitate BaCO_(3)(s) obtained from the 25 ml of test solution was: [Atomic weight :Ba =137, C=12, O=16]

    A
    27.58
    B
    275.8
    C
    492.5
    D
    49.25

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    A sample of magnisium metal containing some MgO as impurity was dissolved in 125 " mL of " 0.1 N H_2SO_4 . The volume of H_2 evolved at 27.3^@C and 1 atm was 120.1 mL. The resulting solution was found to be 0.02 N with respect to H_2SO_4 . Calculate (i) the weight of sample dissolved and (ii) the percentage by weight of Mg in the sample. Neglect any change in the volume of the solution (atomic weight of Mg=24.3 ).

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