Class 11 Chemistry Chapter 10 The s-Block Elements MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 10 The s-Block Elements. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

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Class 11 The s-Block Elements MCQs

1. The chemical formula of baking powder is————-

(a) NaHCO₃

(b) Na₂CO₃

(c) Na₂SO₄

(d) NaCl

Ans: (a)

Solution: The chemical formula of baking powder is NaHCO₃

2. Which has the maximum electropositive character?

(a) Cu

(b) Cs

(c) Ba

(d) Cr

Ans: (b)

Solution: Cs being an alkali metal is maximum electropositive in nature.

3. When the washing soda is heated

(a) CO is released

(b) CO + CO₂ is released

(c) CO₂ is released

(d) water vapours are released

Ans: (d)

Solution: upon heating, washing soda loses water molecules and becomes anhydrous sodium carbonate which does not decompose upon further heating.

4. Which sulfate has the highest solubility in water?

(a) BaSO₄

(b) CaSO₄

(c) BeSO₄

(d) MgSO₄

Ans: (c)

Solution: BeSO₄ has the highest solubility due to maximum hydration energy.

5. Which of the following metal ions plays an important role in muscle contraction?

(a) K⁺

(b) Na⁺

(c) Mg²⁺

(d) Ca²⁺

Ans: (d)

Solution: Ca²⁺ ions are involved in muscle contraction.

6. The correct order sequence of of the increasing covalent character is:

(a) LiCl < NaCl < BeCl₂

(b) BeCl₂ < LiCl < NaCl

(c) NaCl < LiCl < BeCl₂

(d) BeCl₂ < NaCl < LiCl

Ans: (c)

Solution: According to the Faizan rule greater the size of cation more is the ionic character, greater the charge on cation more is the covalent character. so the correct order of covalent character of the given compounds are NaCl < LiCl < BeCl₂

7. Which of the following alkaline earth metal ions has the highest ionic mobility in aqua solution?

(a) Be²⁺

(b) Ca²⁺

(c) Ba²⁺

(d) Mg²⁺

Ans: (c)

Solution: The ionic mobility Is the maximum in Ba²⁺ ions since it has the least tendency to get hydrated.

8. Which one of the alkali metals form only the normal oxide M₂O on heating in air?

(a) Rb

(b) K

(c) Li

(d) Na

Ans: (c)

Solution: Lithium forms normal oxide Li₂O.

9. As the alkaline earth metal (except Be) tend to lose their valence electron readily they act as:

(a) weak oxidizing agents

(b) weak reducing agents

(c) strong oxidizing agents

(d) strong reducing agents

Ans: (d)

Solution: the alkaline earth metal (except Be) tends to lose its valence electrons readily and they act as strong reducing agents.

10. The alkaline earth metal present in chlorophyll is ———–

(a) Be

(b) Mg

(c) Se

(d) Ba

Ans: (b)

Solution: The alkaline earth metal present in chlorophyll is Magnesium (Mg).

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