Entry Test 2021 Chemistry Group III A And IV A Elements MCQS Online Preparation Sample Paper Questions with Answer

chemistry / By
Spread the love

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

Find out about the mysterious elements of Group IIIA, which are characterised by their interesting occurrence and unique properties. Our exploration reveals their diverse nature, from their presence in different minerals and ores, to the peculiar behavior of boron, the smallest element in the group. Explore more about these fascinating elements and more on Nokryan.com as we transition from boron’s remarkable ability to form covalent compounds, despite being a metalloid, to its unique reactions in the borax bead test.

Group III A and IV A Elements By Nokryan.com

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

Scroll to Top