Ecat Entry Test Chemistry S-Block Elements MCQs

chemistry / By
Spread the love

S Block Elements, Properties of s Block Elements, Atomic and Ionic Radii, Ionization Enthalpy, Hydration Enthalpy. 

The periodic table contains the Chemistry S-Block Elements that consist of alkali metals as well as alkaline earth metals. The elements demonstrate high reactivity because their low ionization enthalpy causes them to occur naturally only in compounds and not in their free forms. These elements’ unique properties, including atomic dimensions, ionic size, hydration heat change, and oxidation values are essential in grasping chemical reactivity. A solid understanding of MCQ questions about s-block elements in the ECAT entry tests helps students develop better problem-solving competence and improves their fundamental chemistry understanding.

Ecat Entry Test Chemistry S-Block Elements MCQs

Important Concepts of Chemistry S-Block Elements

Within the Group I elements of the periodic table lithium along with sodium, potassium, rubidium, cesium, and francium possess high reactivity properties to form ionic bonds. Their broad size and low requirement for energy to lose electrons enable them to create positive ions through the donation of electrons. Alkaline earth metals (Group II)—beryllium, magnesium, calcium, strontium, barium, and radium—exhibit higher ionization energies than alkali metals but still form ionic compounds due to their electron configuration.

Properties of S-Block Elements

S-block elements display unique physical and chemical characteristics that serve crucial functions during industrial as well as biological manufacturing processes. Alkali elements react very passionately to form powerful ionic bonds and alkaline earth elements possess mid-range reactivity properties used in building construction and medical treatments. Their electron configuration serves as the main reason for their low electronegativity and high electrical conductivity.

Atomic and Ionic Radii

S-block element atomic and ionic radii display regular patterns across the groups. Elements at higher positions down the group have increased atomic and ionic radii because the addition of electron shells occurs. Among elements in their periods, alkali metals possess the greatest radii which triggers their extremely reactive nature. The larger nuclear charge in alkaline earth metals causes their atomic as well as ionic radii to be smaller than those of alkali metals.

Ionization Enthalpy

The process of removing an electron from an atom requires less energy as the group position descends within the s-block elements. Items of alkali metals undergo the most minimal ionization enthalpy within their respective periods which results in their strong electropositive characteristic. The ionization enthalpies of alkaline earth metals are slightly higher than alkali metals yet they remain reactive elements, particularly with non-metal substances. The knowledge of this property is essential for studying why ionic compounds form.

Hydration Enthalpy

Hydration enthalpy stands as the energy released during an ion’s water molecule interaction. The hydration enthalpies of s-block elements increase as the ions get smaller because of enhanced attraction forces. The two smallest cations belonging to their groups show the maximum hydration enthalpy among other group members. The properties of hydration enthalpy enable these elements to find applications in chemical production and pharmaceutical fields because they shape their compound solubility and stability.

Chemical Reactivity of S-Block Elements

The ease with which s-block elements donate electrons determines their chemical reactivity pattern. The alkali metals produce hydrogen gas and strong alkalis when they interact with water with high amounts of reactivity yet alkaline earth metals demonstrate less intense reactions with water. Such elements which form strong ionic bonds serve as indispensable components in industrial settings including battery manufacturing as well as metallurgy and pharmaceutical production.

Conclusion

Understanding Chemistry S-Block Elements is vital for ECAT aspirants, as these elements exhibit fundamental chemical behaviors that impact various industrial and biological applications. Their atomic structure, ionization properties, solubility trends, and reactivity are essential concepts frequently tested in competitive exams. By practicing MCQs, students can strengthen their grasp of these principles and enhance their exam performance. Explore more comprehensive study resources on Nokryan.com for in-depth chemistry preparation.

MCQ’s on Chemistry S-Block Elements

1. Down’s cell is used prepare ?

  • Sodiumcorrect
  • Sodium hydroxide
  • Calcium
  • Magnesium

2. The oxides of beryllium are ?

  • None of these
  • Acidic
  • Basiccorrect
  • Amphoteric

3. Which are being formed by alkali metals  ?

  • Carbides
  • Peroxidescorrect
  • Oxides
  • Nitrides

4. The mineral CaSO4 2H2O has the general name ?

  • Dolomite
  • Epsom salt
  • Gypsumcorrect
  • Calcite

5. Plaster of paris is mixed with water, the expansion in volume is ?

  • 2%
  • 3%
  • 1%correct
  • 4%

6. Which one of the following is not alkali metal ?

  • Radiumcorrect
  • Rubidium
  • Francium
  • Caesium

7. All alkali metals react with acetylene to form acetylides except ?

  • Licorrect
  • K
  • Na
  • Rb

8. Lime is often used as an agent ?

  • Reducing
  • Oxidizing
  • Dehydratingcorrect
  • Hydrating

9. Decomposition of carbonates of alkaline earth metals produce gas ?
A = N2
B = Oxide
C = CO2
D = CO

  • D
  • B
  • A
  • Ccorrect

10. Which is insoluble carbonate ?
A = KCO 3
B = Ca CO 3
C = Na2 CO 3
D = None of these

  • Bcorrect
  • A
  • D
  • C

11. Down’s cell is used to prepare ?

  • Sodium metalcorrect
  • Sodium carbonate
  • Sodium hydroxide
  • Sodium bicarbonate

12. Diaphragm cell is used to prepare ?

  • Magnesium
  • Sodium hydroxidecorrect
  • Sodium
  • Calcium

13. Acidic soils are neutralized by adding ?

  • Plaster of paris
  • Limecorrect
  • Brine
  • Milk of Magnesia

14. Which element is deposited ad the cathode during the electrolysis of brine in Nelson’s cell ?
A = H2
B = Na
C = Cl2
D = O2

  • B
  • C
  • D
  • Acorrect

15. cement plaster is made by mixing plaster of paris with ?

  • Gypsom
  • Glue or oilcorrect
  • glycol
  • Alum or borax

16. Which of the following sulphates is not soluble in water ?

  • Sodium sulphate
  • Zinc sulphate
  • Barium sulphatecorrect
  • Potassium sulphate

17. Chlorophyll contains in it ?

  • Li
  • Na
  • Mgcorrect
  • Ca

18. Which is used in plaster of paris to make hard finish plasters ?

  • glue or oil
  • Glycol
  • gypsom
  • Alum or boraxcorrect

19. Chile saltpetre has the chemical formula ?
A = NaNO 3
B = KNO 3
C = Na 2 B 4 O 7
D = None of these

  • D
  • A
  • Bcorrect
  • C

20. CO 2 absorber used in breathing tanks is ?
A = K2 O2
B = K2 O
C = KO2
D = Na2 O 2

  • D
  • A
  • Ccorrect
  • B

21. Which one of the following does not belong to alkaline earth metals ?

  • Ba
  • Rncorrect
  • Be
  • Ra

22. Which oxide is insoluble ?
A = Li2 O
B = Na2 O
C = K2
D = Ba O

  • B
  • D
  • Acorrect
  • C

23. Which ion will have the maximum value of heat of hydration ?
A = Na +
B = Cs +
C = Ba +2
D = Mg +2

  • B
  • Dcorrect
  • A
  • C

24. Milk of lime is ?
A = Mg O
B = Ca
C = Ca (OH) 2
D = None of these

  • Ccorrect
  • A
  • B
  • D

25. Gypsom added in cement is ?

  • 1%
  • 3%
  • 2%correct
  • 4%

Chemistry

Scroll to Top