Ecat Entry Test Chemistry Group III A And IV A Elements MCQs

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GROUP IIIA ELEMENTS, Occurrence, Peculiar Behaviour of Boron, Borax Bead Test, Boric Acids.

Students who need to pass the ECAT entry test must understand fundamental concepts about the chemical nature of Chemistry Group III A And IV A Elements. This element group demonstrates dissimilar chemical behaviors which include boron’s distinctive covalent bonding within Group III A combined with the metal and non-metal features found within Group IV A. Boron supports many industrial applications yet Group IV A elements silicon and lead help power technical electronics and construction development. Competitive exams require knowledge of occurrences, properties, exceptional chemical behaviors, and chemical reactions for this topic.

Ecat Entry Test Chemistry Group III A And IV A Elements MCQs

Occurrence and Properties of Group III A Elements

Group III A includes boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). The main occurrence of Boron as a metalloid element occurs in the mineral forms of borax (Na₂B₄O₇·10H₂O) and kernite (Na₂B₄O₇·4H₂O). Aluminum exists as the most prevalent metal in Earth’s crust layers where it is removed from bauxite deposits (Al₂O₃·xH₂O). The semiconducting industry makes specific use of gallium and indium alongside other elements.

Peculiar Behavior of Boron

Due to its tiny atomic dimensions and strong ionization resistance boron bonds covalently instead of forming metallic bonds. Boron crystals fail to conduct electricity as most traditional metal crystals do. The compound boranes (B₂H₆) along with other electron-deficient compounds show unique bonding characteristics because of their chemical composition.

Borax Bead Test and Boric Acid

The borax bead test is a qualitative analysis technique used to detect transition metals. A heated borax bead reveals its color change according to the specific metal contained within it. Boric acid (H₃BO₃) represents an essential boron compound that functions as a weak acid for its use in antiseptics as well as glass production and flame retardants.

Group IV A Elements and Their Characteristics

The Group IV A elements consist of carbon (C), silicon (Si), germanium (Ge), tin (Sn) and lead (Pb). Carbon displays three different natural variations which include diamond and graphite and fullerenes. The semiconductor industry heavily depends on silicon which occurs naturally in silicates and quartz. The heavy metal element lead (Pb) serves multiple applications in batteries and radiation shielding despite being toxic to the environment.

Chemical Properties of Group IV A Elements

These elements exhibit variable oxidation states (+2, +4) due to the presence of an inert pair effect, especially in lead and tin. Silicon forms covalent compounds like SiO₂, while lead forms ionic compounds such as PbCl₂.

Conclusion

Chemistry Group III A And IV A Elements play a significant role in various industrial and scientific fields. Boron’s unique bonding, the importance of aluminum, and the semiconductor applications of silicon highlight the practical relevance of these elements. Understanding these properties is essential for ECAT exam preparation and future scientific advancements.

1. Density of aluminium is (g cm -3 ?

  • B
  • Alcorrect
  • Si
  • Ge

2. Tincal is a mineral of ?

  • C
  • Bcorrect
  • S i
  • A I

3. Which element among the following belongs to group IV-A of the periodic table ?

  • Barium
  • Iodine
  • Oxygen
  • Leadcorrect

4. Borax is hydrated ?

  • Penta
  • Octa
  • Decacorrect
  • Hepta

5. What is going to replace the petroleum ?

  • Siliconescorrect
  • Silicates
  • Silica
  • Silicon

6. Pb has inert pair of electrons ?

  • Four
  • One
  • Three
  • Twocorrect

7. Which element forms an ion with charge 3+ ?

  • Beryllium
  • Siliconcorrect
  • Carbon
  • Aluminium

8. Dipole moment of CO molecule is ?

  • 1.112 D
  • 0.112 Dcorrect
  • 2.112 D
  • 0.0

9. Which of the following elements is not present abundantly in earth’s crust ?

  • Sodiumcorrect
  • Aluminium
  • Silicon
  • Oxygen

10. Corrundam is ore of ?

  • Alcorrect
  • Li
  • Be
  • B

11. Which is used in navigational equipments ?

  • Be
  • Mg
  • B
  • A Icorrect

12. Silicon atom is hybridized ?
A = sp
B = sp2
C = sp3
D = dsp2

  • D
  • B
  • Ccorrect
  • A

13. Which is not the form of silica ?

  • Smoky
  • Rose quartz
  • None of thesecorrect
  • Amethyst quartz

14. Copper oxide is detected by borax bead test with colour ?

  • Bluecorrect
  • Red
  • Yellow
  • Black

15. Which property is not present in Al ?

  • Changes litmus paper
  • Reacts with bases
  • Reacts with acids
  • Changes methyl orange colourcorrect

16. What is chrome yellow ?
A = PbO
B = Pb2
C = PbCrO4
D = Pb3 O4

  • Ccorrect
  • B
  • A
  • D

17. At is the most element in earth crust ?

  • O
  • Si
  • Pb
  • Alcorrect

18. Aluminium oxide is ?

  • Acidic oxide
  • None of these
  • Amphoteric oxidecorrect
  • Basic oxide

19. Which has soapy touch ?
A = Na2 B4 O7
B = H3 BO 2
C = Ca2 B6 O11
D = HBO2

  • Bcorrect
  • D
  • C
  • A

20. Which is used to remove air bubbles from metals ?

  • A Icorrect
  • Mg
  • B
  • Be

21. Which metal is used in the thermit process because of its activity ?

  • Zinc
  • Iron
  • Aluminiumcorrect
  • Copper

22. Hybridization in carbon is ?
A = sp
B = sp2
C = sp3
D = d2sp

  • D
  • B
  • Acorrect
  • C

23. Which is litharge or massicot ?
A = PbO
B = Pb2 O
C = Pb3 O4
D = PbO2

  • Acorrect
  • D
  • B
  • C

24. A compound used as eye wash ?

  • Borax
  • Metaboric acid
  • Boric acidcorrect
  • Pyroboric acid

25. Boric acid cannot be used ?

  • For enamels and glazes
  • In soda bottlescorrect
  • As antiseptic in medicine
  • For washing eyes

Chemistry

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