12th Class Chemistry Quiz Ranking Competition

12th Class Chemistry Quiz Ranking Competition Announcing the International 12th Class Monthly Chemistry Quiz Ranking Competition of 2025!

The International 12th Class Chemistry Quiz Ranking Competition of 2025 invites all 12th students with a passion for chemistry to put their knowledge to the test. No registration fees required, just pure scientific enthusiasm!

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Time: 30 Minutes for 20 Question.

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Class 12th Chemistry Quiz Contest [Dec 2024]

The number of attempts remaining is 1

1 / 20

1. IUPAC name of ethyl isopropyl ketone is

4-methyl pent-3-one

2-methyl pent-3-one

4-methyl pent-2-one

2-methyl pent-2-one

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2 / 20

2. Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statements is not true:

Chlorine and iodine are used as strong disinfectants.

Dilute solutions of boric acid and hydrogen Peroxide are strong antiseptics.

Disinfectants harm the living tissues.

A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.

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3 / 20

3. Which among MeX, RCH₂X, R₂CHX and R₃CX is most reactive towards SN₂ reaction?

MeX

RCH₂X

R₂ C HX

R₃CX

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4 / 20

4. Which one of the following halogen compounds is difficult to be hydrolysed by SN1 mechanism?

Tertiary butyl chloride

Isopropyl chloride

Benzyl chloride

Chlorobenzene

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5 / 20

5. An organic molecule necessarily shows optical activity if it

contains asymmetric carbon atoms

is non-polar

is non-superimposable on its mirror image

is superimposable on its mirror image

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6 / 20

6. The order of reactivity of the given haloalkanes towards nucleophile is :

RI > RBr > KCl

RCl > RBr > RI

RBr > RCl > RI

RBr > RI > RCl

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7 / 20

7. Which of the following is liquid at room temperature (b.p. is shown against it)?

CH₃I 42ºC

CH₃Br 3ºC

C₂H₅ C l 12ºC

CH₃F –78ºC

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8 / 20

8. Bithional is added to soap as an additive to function as a/an

softener

hardener

dryer

antiseptic

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9 / 20

9. The process of separation of a racemic modification into d and l -enantiomers is called

Resolution

Dehydration

Revolution

Dehydrohalogenation

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10 / 20

10. Which of the following forces explain the boiling point of aldehydes and ketones?

Hydrogen bonding

van der Waal’s forces

Dipole-dipole attraction

None of these

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11 / 20

11. An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitrosoamine. The compound is

CH₃NH₂

CH₃CH₂NH₂

CH₃CH₂NHCH₂CH₃

(CH₃CH₂)₃N

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12 / 20

12. Acetaldehyde reacts with

Electrophiles only

Nucleophiles only

Free radicals only

Both electrophiles and nucleophiles

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13 / 20

13. Sodium salt of benzene sulphonic acid on fusion with caustic soda gives

Benzene

Phenol

Thiophenol

Benzoic acid

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14 / 20

14. Which of the following is an optically active compound?

4-Hydroxyheptane

1-Butanol

1-Propanol

2-Chlorobutane

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15 / 20

15. Which is highly soluble in water?

Methanal

Propanal

Propanone

Butanone

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16 / 20

16. Conant Finkelstein reaction for the preparation of alkyl iodide is based upon the fact that

Sodium iodide is soluble in methanol, while sodium chloride is insoluble in methanol

Sodium iodide is soluble in methanol, while NaCl and NaBr are insoluble in methanol

Sodium iodide is insoluble in methanol, while NaCl and NaBr are soluble

The three halogens differ considerably in their electronegativity

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17 / 20

17. Penicillin is an :

antipyretic

antibiotic

anaesthetic

antiseptic

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18 / 20

18. Schiff’s reagent gives pink colour with

acetaldehyde

acetone

acetic acid

methyl acetate

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19 / 20

19. Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of

steric hindrance

inductive effect

instability

insolubility

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20 / 20

20. Phosgene is a common name for

phosphoryl chloride

thionyl chloride

carbon dioxide and phosphine

carbonyl chloride

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Chemistry Quiz Competition Details for 2025:

• Registration: No Registration required. Only attempt Participate without any charges! Embrace this chance to pit your chemistry skills against international competitors.
• Competition Time: 24 x 7 but once every month
• Results Announcement: 2nd day of next month

Eligibility Criteria for 12th Grade Chemistry Quiz Competition 2025:

Contestants must be enrolled in the 12th grade or its international equivalent. A fervent interest in chemistry and the drive to learn is all we seek!

Competition Format: Tackle a series of intriguing questions spanning various chemistry subjects. This is your chance to flaunt your understanding of chemical reactions, properties, and much more.

Preparation Tips for the Chemistry Quiz Competition:

1. Familiarize with Your Syllabus: Delve deep into your 12th-grade chemistry curriculum. Mastery over every topic is crucial.
2. Daily Chapter-wise Chemistry Quizzes: Engage in our tailored quizzes to solidify concepts and pinpoint areas demanding more attention.
3. Engage in Peer Competition: Share quizzes with peers and indulge in friendly battles to spice up your preparation journey.

By embracing these strategies, you’re gearing up to ace the International 12th Class Chemistry Quiz Ranking Competition of 2025. Best of luck!

Also other quiz competition for 2025

• International 12th Class Physics Quiz Ranking Competition 2025
• International 12th Class Mathematics Quiz Ranking Competition 2025
• International 12th Class Biology Quiz Ranking Competition 2025

FAQ of 12th Chemistry Quiz Competition 2025

Swati Kumari

I am an experienced chemistry teacher and content developer specializing in chemistry and science subjects at QuizRanker. With a Master’s degree in Chemistry from Delhi University, I bring a deep understanding of the subject and a passion for teaching. In addition to creating engaging educational content, I offer personalized one-on-one live tutoring sessions for students. I am available to support learners in 11th and 12th grade chemistry, as well as science subjects for students up to 10th grade.

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