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S(2) : Plaster of paris is a hemihydrate...

`S_(2) :` Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above `393K`.
`S_(2) :` Sodium carbonate is used in water softening.
`S_(4) :` The order of mobilities of the alkali metal ions in aqueous solutions is `Li^(+)gtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)`

A

` T T F`

B

`T T T `

C

`F T F`

D

`F F F`

Text Solution

Verified by Experts

The correct Answer is:
3
`S_(1):(2CaSO_(4).2H_(2)O)overset(393K)rarr2(CaSO_(4)).H_(2)O+3H_(2)O,` above `393K` dead burnt plaster is obtained.
`S_(2):Ca^(2+)+Na_(2)CO_(3)rarrCaCO_(3)darr+2Na^(+)`
`S_(3):Li^(+) lt Na^(+) lt K^(+) lt Kb^(+) lt Cs^(+)`
Bigger hydrated ion moves slower in aqueous solution.
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(a) Why is LiF least soluble in water among the fluorides of alkali metals ? Justify the given (b) Justify the given order of mobilites of the alkali mteal cations in aqueous solution: Li lt Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+) (c) Lithium is the only alkali metal which forms a nitride directly. Explain . (d) E^(@) for M^(2+)(aq)toM(s) (where M=Ca,Sr or Ba) is nearly constant. Discuss.

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 :

Knowledge Check

  • Consider the following statements , S_(1) :Gypsum contains a lower percentage of calcium than plaster of pair S_(2) : Plaster of paris can be re-obtained by hydration of dead plaster S_(3) : Gypsum loses (3)/(2) of its water of crystallisation forming plaster of paris at 120^(@)C S_(4) : Plaster of paris can be obtained by partial oxidation of gypsum. and arrange in the order of true/false.

    A
    TFTF
    B
    FFTF
    C
    TTFF
    D
    TTTT

  • Consider the following statements: S_(1) : Among alkali metal halides lithium iodide is the most covalent in nature. S_(2) : Potassium has greater photoelectric work function than sodium. S_(3) : The blue solution osf alkali metals in liquid ammonia is stable at room temperature, where ammonis is still a liquid, in the presence of Fe. S_(4) : The melting and boilling points of alkali metal halides always follow the trend : chloride gt flouridegtbromidegtiodide. and arrange in the order of true/iodide.

    A
    T F F F
    B
    T T F F
    C
    T F T T
    D
    T T T F

  • 0.1 M aqueous solution of HClO_4, ZnCl_2 and K_2S are taken , then increasing order of pH of solutions will be :

    A
    `K_2S lt ZnCl_2 lt HClO_4`
    B
    `K_2S lt HClO_4 lt ZnCl_2`
    C
    `HClO_4 lt ZnCl_2 lt K_2S`
    D
    `HClO_4 lt K_2S lt ZnCl_2 `

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    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 . Which of the following are arranged in increasing order of solubilities ?

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