Ecat Entry Test Chemistry The Halogens and Noble Gases MCQs

chemistry / By
Spread the love

Introduction to Chemistry The Halogens and Noble Gases

Within the periodic table, the groups of halogens and noble gases hold crucial positions because of their exclusive chemical behavior. Within Group VII-A halogens contain five elements beginning with fluorine (F) and progressing to chlorine (Cl) followed by bromine (Br), iodine (I), and closing with astatine (At). The group members exhibit double characteristic features of strong electronegativity and salt formation with metals. The noble gases (Group VIII-A) comprise helium (He) neon (Ne) argon (Ar) and krypton (Kr) and xenon (Xe) and radon (Rn) which remain inert because all their valence electron shells are complete. Entry test preparation specifically in ECAT examinations requires knowledge of Chemistry The Halogens and Noble Gases elements because test questions evaluate their properties alongside their oxidation states and applications.

Ecat Entry Test Chemistry The Halogens and Noble Gases MCQs

Halogens: Properties and Reactivity

The diatomic molecular compounds of halogens include F₂ Cl₂ Br₂ and I₂ among others. The strength of oxidizing power decreases across the halogen group starting from fluorine which stands as the strongest agent. F₂ serves as the most electronegative element which can oxidize other halogens from their chemical compounds. Halogens and oxygen form acidic oxides and then interact with hydrogen elements in chemical reactions which produce hydrogen halides (HX) before dissolving in water to generate strong acids including HCl and HF. The oxidation state of fluorine remains at -1 throughout all its chemical reactions while other halogens show variable possible oxidation states.

Noble Gases: Stability and Applications

Noble gases are colorless, odorless, and chemically inert due to their complete valence electron shells. These gases require a great amount of energy for ionization while exhibiting minimal chemical reaction tendencies. Under certain conditions, heavier noble gases including xenon (Xe) will create compounds that include XeF₂, XeF₄, and XeO₃. Various applications benefit from noble gases such as heating systems cool using helium while neon powers lamps argon supports welding operations and xenon serves anesthesia purposes. These inert gases are excellent suitability for advanced industrial applications and medical applications because of their non-reactive properties.

Multiple-Choice Questions (MCQs) for ECAT Preparation

1. Which has the least oxidizing power ?
A = F2
B = Cl2
C = Br2
D = I2

  • C
  • Dcorrect
  • A
  • B

2. Which halogen can oxidize all the other halogen into free halogens from their compounds ?
A = F2
B = Cl2
C = Br2
D = I2

  • B
  • D
  • C
  • Acorrect

3. Which has complete valence shell ?

  • N
  • Necorrect
  • O
  • C

4. Astatine belongs to group ?

  • I-A
  • II-A
  • VII-Acorrect
  • III-A

5. Gaseous HF exists in the form of ?

  • As single entity
  • Both a and bcorrect
  • Cyclic hexamers
  • Monomers

6. Hydrogen bond is the strongest between the molecules of ?

  • HBr
  • HFcorrect
  • HCl
  • Hl

7. Oxidation state of fluorine is ?

  • +1
  • +2
  • -2
  • -1correct

8. Half life period of astatine is ?

  • 8.2 Hrs
  • 8.3 Hrscorrect
  • 8.4 Hrs
  • 8.1 Hrs

9. An element that has a high ionization energy and tends to be chemically inactive would most likely to be ?

  • A halogen
  • A transition element
  • A noble gascorrect
  • An alkali metal

10. Chlorine heptoxide (Cl 2 O 7) reacts with water to form ?

  • Chloric acid
  • Hypochlorous acid
  • Chlorine and oxygen
  • Perchloric acidcorrect

11. Which halogen has maximum Van-der Waal’s forces ?
A = F2
B = Cl2
C = Br2
D = I2

  • Dcorrect
  • C
  • B
  • A

12. Which is the strongest acid ?
A = HClO
B = HClO2
C = HClO3
D = HClO4

  • A
  • C
  • Dcorrect
  • B

13. Angle is OF2 is ?

  • 180º
  • 120º
  • 102º
  • 105ºcorrect

14. Noble gases are placed is group ?

  • Group IV-A
  • Group V-A
  • Group VI-A
  • Group VII-Acorrect

15. The only non-metal in liquid form is ?

  • P
  • S
  • Brcorrect
  • Cl

16. Which of the following represents the correct electronic configuration of the outermost energy level of an element of zero (VIIIA) group in the ground state ?
A = s2 p2
B = s2 p4
C = s2 p5
D = s2 p6

  • B
  • C
  • A
  • Dcorrect

17. Bleaching powder may be produced by passing chlorine over ?

  • Calcium hydroxidecorrect
  • Calcium carbonate
  • Anhydrous calcium sulphate
  • Hydrated calcium sulphate

18. Which compound of noble gas xenon can be prepared ?

  • Oxyfluorides
  • Oxides
  • Fluoride
  • All of thesecorrect

19. Which halogen has lustrous shining ?
A = F2
B = Cl2
C = Br2
D = I2

  • B
  • C
  • A
  • Dcorrect

20. Which is used in are welding and cutting ?

  • Arcorrect
  • Ne
  • Kr
  • He

21. Which halogen will react spontaneously with Au (8) to produce Au 3+ ?
A = Br2
B = F2
C = I2
D = Cl2

  • Dcorrect
  • B
  • C
  • A

22. The most reactive elements are ?

  • Group IV-A
  • Group VII-Acorrect
  • Group VI-A
  • Group V-A

23. Which of the following hydrogen halide is the weakest acid in solution ?

  • Hl
  • HCl
  • HBr
  • HFcorrect

24. Which halogen occurs naturally in a positive oxidation state ?

  • Iodinecorrect
  • Bromine
  • Chlorine
  • Fluorine

25. Smell of halogens is ?

  • Sweet
  • Fruity
  • Irritating
  • Rotten eggcorrect

Conclusion

Study of the Chemistry The Halogens and Noble Gases are crucial for preparing for ECAT because these elements have distinctive chemical behaviors together with industrial purposes. Halogens act as reactive chemical elements in industrial setups yet noble gases have natural inert properties that enable their use in lighting systems welding applications and medical tools. Mastering their characteristics will provide a strong foundation for entry-test success.

For more MCQs and chemistry concepts, visit Nokryan.com and enhance your test preparation today!

Chemistry

Scroll to Top