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  • How to solve this problem- - s- Block Elements ( Alkali and Alkaline earth metals ) - NEET

Match List- I with List- II for the compositions of substances and select the correct answer using the code given below the lists:

List- I                                                         List- II

Substances                                               Composition

(1) plaster of paris                                     (i) C_{a}SO_{4}.2H_{2}O

(2) Epsomite                                              (ii) C_{a}SO_{4}.\frac{1}{2}H_{2}O

(3) Kieserite                                                (iii) M_{a}SO_{4}.7H_{2}O

(4) Gypsum                                                (iv) M_{g}SO_{4}.H_{2}O

                                                                    (v) C_{a}SO_{4}

  • Option 1)

    Code :

    (1)         (2)        (3)           (4)

    (iii)          (iv)       (i)          (ii)

  • Option 2)

    Code :

    (1)         (2)        (3)           (4)

    (ii)           (iii)       (iv)          (i)

  • Option 3)

    Code :

    (1)         (2)        (3)           (4)

    (i)           (ii)       (iii)             (v)

  • Option 4)

    Code :

    (1)         (2)        (3)           (4)

    (iv)          (iii)       (ii)          (i)

 

Answers (1)

best_answer

As we learnt in concept

Plaster of paris -

It is hemihydrate of calcium sulphate

On mixing with water, it takes up the water of crystallisation and is converted into dihydrate which sets into hard mass

- wherein

formula:

CaSO_{4}.\frac{1}{2}H_{2}O\xrightarrow[]{H_{2}O(setting)}CaSO_{4}.2H_{2}O\xrightarrow[]{Orthorhombic}CaSO_{4}.2H_{2}O(Monoclinic\ gypsum)

 

 plaster of paris:CaSO_{4}.\frac{1}{2}H_{2}O

Epsomite:MgSO_{4}.7H_{2}O

Kieserite:MgSO_{4}.H_{2}O

Gypsum:CaSO_{4}.2H_{2}O


Option 1)

Code :

(1)         (2)        (3)           (4)

(iii)          (iv)       (i)          (ii)

This solution is incorrect 

Option 2)

Code :

(1)         (2)        (3)           (4)

(ii)           (iii)       (iv)          (i)

This solution is correct 

Option 3)

Code :

(1)         (2)        (3)           (4)

(i)           (ii)       (iii)             (v)

This solution is incorrect 

Option 4)

Code :

(1)         (2)        (3)           (4)

(iv)          (iii)       (ii)          (i)

This solution is incorrect 

Posted by

divya.saini

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