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NCERT Exemplar · Class 11 · Chemistry

Chapter 10: The s-Block Elements

Practice each question, then open the answer or worked solution.

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II. Multiple Choice Questions (Type-II)

24 questions
Q42Written answer

Match the compounds given in Column I with their uses mentioned in Column II.

Column I

(i) CaCO3

(ii) Ca(OH)2

(iii) Cao

(iv) CaSO4

Column II

(a) Dentistry, ornamental work

(b) Manufacture of sodium carbonate from caustic soda

(c) Manufacture of high-quality paper

(d) Used in whitewashing
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Worked solution

(i) is c

(ii) is d

(iii) is b

(iv) is a

Q43Written answer

Match the elements given in Column I with the colour they impart to the

flame has given in Column II.

Column I

(i) Cs

(ii) Na

(iii) K

(iv) Ca

(v) Sr

(vi) Ba

Column II

(a) Apple green

((b) Violet

(c) Brick red

(d) Yellow

(e) Crimson red

(f) Blue
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Worked solution

(i) is f

(ii) is d

(iii) is b

(iv) is c

(v) is e

(vi) is a

V. Assertion and Reason Type

In the following questions, a statement of Assertion (A) followed by a statement

of Reason (R) is given. Choose the correct option out of the choices given

below each question.

Q44Written answer

Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2.

Reason (R): Lithium being very small in size polarises large carbonate ion leading to the formation of more stable Li2O and CO2.

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct

(iv) A is not correct but R is correct.

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Worked solution

Option (i) is correct.

Q45Written answer

Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon dioxide.

Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct.

(iv) A is not correct but R is correct.

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Worked solution

Option (i) is correct.

Important Concepts Discussed in Class 11 Chemistry Chapter 10 The s-Block Elements

  1. Group 1 Elements: Alkali Metals
  2. General Characteristics of the Compounds of the Alkali Metals
    1. Oxides and Hydroxides
    2. Halides
    3. Salts of Oxo-acids
  3. Anomalous Properties of Lithium
  4. Some Important Compounds of Sodium
  5. Biological Importance of Sodium and Potassium
  6. Group 2 Elements: Alkaline Earth Metals
  7. General Characteristics of Compounds of the Alkaline Earth Metals
  8. Anomalous Behaviour of Beryllium
  9. Some Important Compounds of Calcium
  10. Biological Importance of Magnesium and Calcium

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