We have compiled the NCERT MCQ Questions for Class 11 Chemistry Chapter 11 The p-Block Elements with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 11 Chemistry with Answers daily and score well in exams. Refer to the p-Block Elements Class 11 MCQs Questions with Answers here along with a detailed explanation.
Class 11 Chemistry S-Block Elements MCQs With Answer
Q1. Which of the following are the correct reasons for the anomalous behavior of lithium?
- Exceptionally small size of its atom.
- Its high polarizing power.
- It has high degree of hydration.
- Exceptionally low ionization enthalpy.
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Ans: 1. Exceptionally small size of its atom.
- Its high polarizing power.
Explanation:
Anomalous behaviour of Li is due to its exceptionally small size and high polarizing power
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Q3. The most correct reason for the colour of the flame due to alkali metal ions is:
- Presence of single valence electron.
- Excitation of valence electron.
- Emission of radiation in visible region when electron come back to the ground state energy level.
- None of the above.
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Ans: 3. Emission of radiation in visible region when electron come back to the ground state energy level.
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Ans: 1. MgCO3
Explanation:
Because it is more covalent and least ionic among these compounds.
Q5. By adding gypsum to cement:
- Setting time of cement becomes less.
- Setting time of cement increases.
- Colour of cement becomes light.
- Shining surface is obtained.
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Ans: 1. Setting time of cement increases.
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Q8. Gypsum on heating about 120 C forms a compound. What is the mass of water of crystallisation in compound
obtained?
- 18
- 36
- 42
- 9
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Ans: 1. K+
Q10. Which of the following element(s) form stable superoxide?
- K
- Rb
- Cs
- All of these
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Ans: 4. All of these
Q11. The property of alkaline earth metals that increases with their atomic number is:
- Electronegativity.
- Solubility of their hydroxides in water.
- Solubility of their sulfates in water.
- Ionesation erthalpy.
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Ans: 2. Solubility of their hydroxides in water.
Explanation:
It is because hydration energy dominates over lattice energy.
Q12. The element responsible for neuromuscular function:
- Ca
- Mg
- K
- Na
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Ans: 1. Ca
Q13. Which of the following does not have rock salt type structure?
- Mgo
- BeO
- BaO
- CaO
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Ans: 2. BeO
Explanation:
BeO does not have rock salt type structure, while all the other oxides of the group have.
Q14. Along the group and the period, atomic and ionic radii respectively:
- Increases and decreases.
- Decreases and increases.
- Decreases and decreases.
- Both remain constant.
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Ans: 1. Increases and decreases.
Q15. Melting and boiling point of the alkaline earth metals are higher than the corresponding alkali metals due to:
- Smaller size.
- Larger size.
- Same size.
- Moderate size.
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Ans: 1. Smaller size.
Q16. Which of the following elements does not form hydride by direct heating with dihydrogen?
- Be
- Mg
- Sr
- Ba
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Ans: 1. Be
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Q17. A substance which gives brick red flame and breaks down on heating to give oxygen and brown gas is:
- Magnesium nitrate.
- Calcium nitrate.
- Barium nitrate.
- Strontium nitrate.
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Q18
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Q19. Which of the following is/are characteristic(s) of baking soda?
- It is used as an antiseptic for skin infections.
- It is used as fire extinguisher.
- It is used in preparation of cakes and bakery product.
- All of the above are correct.
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Ans: 4. All of the above are correct.
Q20.
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Ans: 3. Li > Na > K > Rb
Q21. Which of the following properties of hydroxides of alkaline earth metals increases from top to bottom?
- Thermal stability.
- Basic character.
- Solubility in water.
- All of these.
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Q22.
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Ans: 4. Sodium hydroxide, NaOH
Explanation:
Sodium hydroxide (NaOH) is commonly known as caustic soda.
Q23.
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Q24. Which of the following is/ are present as impurity in crude sodium chloride?
- Magnesium chloride.
- Calcium chloride.
- Sodium sulphate.
- All of the above.
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Ans: 4. All of the above.
Q25. In context of Be, which one of the following statement is incorrect?
- It is rendered passive be HNO3 .
- It form Be2 C.
- Its salts rarely hydrolyse.
- Its hydride is electron deficient and polymeric.
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Ans: 3. Its salts rarely hydrolyse.
Explanation:
Its salts are covalent and get easily hydrolysed.