The elements in which the last electron is present in the s orbital are termed s–block elements. It comprises two groups: group 1 and group 2. Group 1 contains one electron in its valence shell, whereas group 2 has two electrons in its valence shell. Its general formula is ns(1−2) and is placed on the left side of the modern periodic table.
The elements of group 1 are known as alkali metals. In contrast, the elements of group 2 are known as alkaline earth metals.
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CBSE Class 11 Chemistry Chapter 10 The s-Block Elements Worksheet – Set 5
Q1. Which of the following is not an ore of magnesium?
(a) Gypsum
(b) Epsom salt
(c) Dolomite
(d) None of the above
Q2. Which of the following readily forms nitride?
(a) Potassium
(b) Magnesium
(c) Barium
(d) None of the above
Q3. Which of the following is formed when gypsum is heated at 390K?
(a) Plaster of Paris
(b) Dead burnt plaster
(c) Both (a) and (b)
(d) None of the above
Q4. Which of the following alkaline earth metals predominantly forms a covalent compound?
(a) Beryllium
(b) Barium
(c) Calcium
(d) None of the above
Q5. Which of the following is kinetically inert toward the water?
(a) Beryllium
(b) Barium
(c) Calcium
(d) None of the above
Q6. What is quicklime? What happens when we add water to quicklime?
Q7. Compare the action of heat on lithium nitrate and sodium nitrate.
Q8. What is the intermediate product in Solvay’s process? Give two uses of sodium bicarbonate.
Q9. Why do elements of the same groups show similar properties?
Q10. Compare the oxidation numbers of lithium and beryllium.
Q11. What is the oxidation state of oxygen in potassium oxide?
Q12. Why is beryllium hydroxide soluble in sodium hydroxide?
Q13. Why is sodium hydroxide immiscible in water?
Q14. Why does the crystalline salt of group 2 elements contain more water of crystallisation than group 1?
Q15. What are the advantages of Down’s process?
Q16. Name the essential ores of sodium. What are the two techniques used to extract sodium from its ores?
Q17. Write the balanced chemical equation for the reaction between
(a) Sodium oxide and carbon dioxide
(b) Beryllium oxide and sulphuric acid
(c) Calcium and water
Q18. What happens when
(a) Sodium metal is dropped in water?
(b) Sodium metal is heated in a free supply of air?
(c) Sodium peroxide dissolves in water?
Q19. Examine the thermal stability and solubility of group 2 element sulphates.
Q20. What are the similarities between lithium and magnesium?
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Read Also:
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- Important Questions for Class 11 Chemistry Chapter 10 – The s-Block Elements.
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