NEET (UG) 2021 Exam – NEET Chemistry Important Q/As

NEET Chemistry Important Q/As 2021

Brief:

NEET 2021 exam dates are finally announced! Dear NEET aspirants, it’s time for your revisions. Here are some of the NEET Chemistry important Q/As (Questions with Answers)! Never miss this chance… Quickly learn how to answer these frequently asked or important NEET chemistry questions…
Get started now!

The latest news on  NEET (UG) 2021 exam 

Hitherto, the periodic postponement of the NEET 2021 exam made both students and scholars anxious regarding the conduct of NEET 2021. But, with yesterday’s latest news announced by our central education minister, the NEET 2021 undergraduate medical entrance exam will be administered on Sep 12, 2021. According to NDTV-Education, the registrations for the upcoming NEET (UG) 2021 exam have opened already… (5 pm on 13th July 2021).

On the other side, experts predict that the board may require at least one to two months buffer after the date of issue of application forms. In addition, a lineup of processes including application processing, correction window, center allotment, etc has to be taken care of.

Visit this site for the official news bulletin regarding NEET (UG) 2021 exam!
Or, try looking at the official NTA site (National Testing Agency) for more information!  

NEET (UG) 2021 Exam: Section-wise Question/ Score distribution

As per the new exam pattern for NEET (UG) 2021, each subject will encompass two sections namely Sec A and Sec A.

  • Sec A will contain 35 questions accounting for 140 marks.
  • Whereas, Sec B will contain 15 questions accounting for 40 marks.
  • As a whole, each subject will contain 50 questions accounting for a total of 180 marks.    
  • This applies to all the subjects: Physics, Chemistry, Botany, and Zoology.
  • Hence, the whole NEET (UG) 2021 exam will contain (50*4) = 200 questions.
  • The total marks would equal (180*4) = 720 marks
  • Here, the questions denote ONLY multiple-choice questions.

Note: Unfortunately, the Education Minister has already clearly stated that the syllabus for NEET (UG) 2021 exam will not get reduced. In spite of this, the students can expect to get some relief in terms of the number of questions they need to attempt. Nevertheless, NEET aspirants like you have to wait for the official news from the NTA. Meanwhile, going through the articles like “NEET Chemistry important Q/As” can really boost your confidence.  

Points to remember on NEET (UG) 2021 Exam Pattern

  • The total No. of questions to be asked might be more than 180.
  • The mode of Exams will be both Pen and Paper-based.
  • The question type would be multiple-choice questions. Specifically, students would be given an OMR sheet where they will mark their answers in blue or black.
  • The duration of the exam: 3 hours.
  • 8 Regional languages are allowed: English, Hindi, Bengali, Marathi, Assamese, Oriya, Gujarati, Tamil, Telugu, Kannada, and Urdu.
  • To sum up, the total marks for the exam is 720

NEET Chemistry 2021 

Started your revisions already? Checklist the Do or Die Chapters and topics for NEET Chemistry 2021 

Are you are worried about how to start and how much time to allot?
Never mind! Here is a quick guide…

SubjectsWeightageTime to be allotted for revisionTime to be allotted day before the exam
  • Basic concepts of chemistry
  • Classification of elements and periodicity in properties
  • Structure of Atom
  • States of Matter: Gases and liquids
  • Chemical Bonding and molecular structure
20%6 hours1 hour
  • Solid-state
  • Thermodynamics
  • Equilibrium
  • Chemical kinetics
  • Redox Reactions
  • Solutions
  • Electrochemistry
32%10 hours2 hours
  • General Principles and Processes of Isolation Elements
  • s-Block Elements (Alkali and Alkaline earth metals)
  • Surface Chemistry
  • Hydrogen
  • Some p-Block elements
  • d and f Block Elements
12%4 hours1 hour
  • Coordination compounds
  • Alcohols, Phenols, and Ethers
  • Organic Chemistry – some Basic principles and techniques
  • Hydrocarbons
  • Haloalkanes and Haloarenes
18%5 hours1 hour
  • Aldehydes, Ketones & Carboxylic Acids
  • Organic Compounds containing Nitrogen
  • Biomolecules
  • Polymers
  • Chemistry in Everyday Life
  • Environmental Chemistry
18%5 hours1 hour
Total 100%30 hours6 hours

 

Beyond the time allocation, you need to know some useful tips and tricks! Explore the blog How to crack NEET Chemistry (score at least 160) at ease?

NEET Chemistry Important Q/As and Question types

Here are some of the important questions asked in the previous NEET (UG) question papers. From this, you can get a fair idea of what kind of questions you should expect in NEET Chemistry 2021. 

How helpful, right? Get started with your revisions now!

Question: 1

If Avogadro no. is changed from 6.022x 1023 mol-1 to 6.022×1020 mol-1, this would change _______. 

  1. The ratio of chemical species to each other in a balanced equation
  2. The definition of mass in units of grams
  3. The mass of one mole of carbon
  4. The ratio of elements to each other in a compound

The correct answer is (C)

If Avogadro o.​ is changed from 6.022×1023mol−1 to 6.022×1020mol−1, this would change

  • the mass of one mole of carbon from 12 grams to 12 milligrams.
  • However, 1, 2, and 3 remain unchanged.

 

Question: 2

At S.T.P. the density of CCl4 vapor in g/L will be nearest to _______. 

  1. 6.87
  2. 3.42
  3. 10.26 
  4. 4.57

The correct answer is (A)

According to Avogadro’s law,

  • 1 mole of every substance occupies 22.4 Liters at standard temp & pressure and
  • Weighs equal to its molecular mass.

Thus mass of at STP =154g

The volume occupied by at STP =22.4L

Density is defined as the mass contained per unit volume.

Density ​=6.875g/L

 

Question: 3

Oxalic acid when heated with H2SO4 gives:

  1. CO2
  2. CO2+H20
  3. H2O
  4. CO

The correct answer is (B) and (D)

Oxalic acid reacts with concentrated sulfuric acid to produce a mixture of carbon monoxide, carbon dioxide, and water.

oxalic acid (COOH)2​​+conc.H2​SO4​→CO+CO2​+H2​O

 

Question: 4

Which of the following will have Zero dipole moment?

  1. Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
  2. Boron trifluoride, carbon dioxide, 1,3-dichlorobenzene, hydrogen fluoride
  3. Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
  4. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene       

The correct answer is (D)

This is a hard category question.

BF3​, BeF2​, CO2​ , and 1, 4-dichloro benzene all are symmetrical structures.

 

Question: 5

The reaction occuring between acetophenone and benzaldehyde in the presence of dilute NaOH is called:

  1. Aldol Condensation
  2. Cannizzaro’s reaction
  3. Cross Cannizzaro’s reaction
  4. Cross Aldol condensation

The correct answer is (D)

(This question also belongs to the hard category.)

Cannizzaro is a chemical reaction that involves the base-induced disproportionation of two molecules of a non-enolizable aldehyde to give primary alcohol and a carboxylic acid. 

Aldol condensation occurs in aldehydes/ketones having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. 

If the condensation reaction occurs between two different aldehyde/ketone compounds it is called crossed aldol condensation.

 

Question: 6

An increase in the concentration of the reactants of a reaction leads to change in:

  1. Collision frequency
  2. Threshold energy
  3. Heat of reaction
  4. Activation Energy

The correct answer is (A)

Collision frequency ∞ number of reactant molecules per unit volume.

As the concentration of reactants of a reaction increases, the number of reactant molecules per unit volume increases. This further increases the collision frequency.

 

Important

Need more such important/ frequently asked questions with answers?

We’re about to launch NEET (UG) Chemistry 2021 Mock Test Practice Papers…! 

 

Frequently asked questions (NEET 2020)

These are some of the questions asked in NEET 2020. Check if you can solve them? If no, start learning from now… 

Question: 1

Identify the correct statements from the following:
(a) CO2(g)CO2(g) is used as a refrigerant for ice cream and frozen food.
(b) The structure of C-60 contains twelve six-carbon rings and twenty-five carbon rings.
(c) ZSM−5ZSM−5, a type of zeolite, is used to convert alcohol into gasoline.
(d) COCO is a colorless and odorless gas.

  1. (a), (b) and (c) only
  2. (a) and (c) only
  3. (b) and (c) only
  4. (c) and (d) only

Solution

(1)CO2(s)CO2(s) (dry ice) is used as a refrigerant for ice cream and frozen food [not CO2(g)CO2(g)].
(2) The structure of C-60 contains twelve 6C rings and twelve 5C rings.
(3) (A type of zeolite) ZSM−5ZSM−5 is used to convert alcohols directly into gasoline.
(4) CO(g)CO(g) is a colorless and odorless gas

 

Question: 2

Identify the incorrect match:

NameIUPAC Official Name
AUnniluniumiMendelevium
BUnniltriumiiLawrencium
CUnnilhexiumiiiSeaborgium
DUnununniumivDarmstadtium

Solution

Atomic numberNameIUPAC official name
101UnniluniumMendelevium
103UnniltriumLawrencium
106UnnilhexiumSeaborgium
111UnununniumRoentgenium

The IUPAC offical name of Unununnium is Roentgenium. Specifically, the element (Z=110) is ununnilium. The IUPAC official name Darmstadtium matches Ununnilium.

 

Question: 3

Which of the following set of molecules will have zero dipole moment?

  1. Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
  2. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
  3. Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
  4. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

Solution

The species with polar bonds and shall be non-polar i.e., have zero dipole moment if the resultant of all dipoles is cancelled due to symmetrical structure.

 

Question: 4

On electrolysis of dilute sulphuric acid using Platinum (Pt) electrode, which gas is obtained at the anode:

  1. Hydrogen gas
  2. Oxygen gas
  3. H2S gas
  4. SO2 gas

Solution

H2SO4 (dilute) on electrolysis using Pt electrodes forms H2 gas at cathode and O2 gas at the anode

 

Question: 5

The reaction occuring between acetone and methyl magnesium chloride, followed by hydrolysis, will give:

  1. Isopropyl alcohol
  2. Secondary butyl alcohol
  3. Tertiary butyl alcohol
  4. Isobutyl alcohol

Solution

In this case, it will be tertiary butyl alcohol. Here, methyl magnesium bromide is a Grignard reagent. On the other hand, acetone is a ketone.

 

Question: 6

Paper chromatography is an example of:

  1. Adsorption chromatography
  2. Partition chromatography
  3. Thin-layer chromatography
  4. Column chromatography

Solution

Paper Chromatography is a type of partition chromatography. In brief, chromatography paper contains water trapped in it, which acts as the stationary phase. The paper selectively retains different components according to their differing partition in two phases.

 

Worried about COVID lockdown amidst NEET (UG) 2021 exam preparation?

Though the COVID lockdown has literally shattered the hopes of millions of aspirants appearing for different national and international competitive exams and tests, NEET aspirants have to consider this lockdown as a blessing in disguise. This is undoubtedly your one-time opportunity to revise more and score more!

Go through how Chemistry Bench suggests you prepare for NEET amidst Lockdown!

 

Personal one-on-one NEET (UG) 2021 exam tutoring

If you are looking for one-on-one NEET coaching or NEET tutoring, please talk to us! To sum up, we can help you prepare for the NEET exam, guide you throughout the course, and in fact crack NEET Chemistry with flying colors.

Of course, the demo class is FREE! Sign up with our NEET expert tutors here!


Importantly, we have a special gift for you! NEET chemistry 2021 formula e-book is releasing shortly…!
Indeed, a much helpful e-book for all NEET aspirants. 

For JEE frequently asked questions, check out IIT JEE Chemistry Important Q/As

Best Wishes,
Team Chemistry Bench

 

Leave A Reply