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The s-Block Elements
Question
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Match (I) with list (II) for the  compositions of substances and select the correct answer using the code given below the lists.


 

List I (substance)

 

List II Composition

A.

Plaster of Paris

1.

CaSO4.2H2O

B.

Epsomite

2.

CaSO4. ½ H2O

C.

Kieserite

3.

MgSO4. 7H2O

D.

Gypsum

4.

5.

MgSO4.H2O

CaSO4

  • A

    B

    C

    D

    3

    4

    1

    2

  • A

    B

    C

    D

    2

    3

    4

    1

  • A

    B

    C

    D

    1

    2

    3

    5

  • A

    B

    C

    D

    4

    		 3 2

    1

Answer

B.

A

B

C

D

2

3

4

1

Plaster of paris = CaSO4.1/2 H2O
Epsomite =MgSO4.7H2O
Gypsum = CaSO4.2H2O
Kieserite = MgSO4.H2O

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Some More Questions From The s-Block Elements Chapter

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?