Category: NEET Chemistry Objective Questions

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Reversible And Irreversible Reaction Multiple Choice Questions

MCQs on Reversible And Irreversible Reaction :

1. The net energy change in a reversible cyclic process is
(A) 3/2 RT
(B) zero
(C) always > 0
(D) always < 0

Answer

Answer: (b)

2. Which of the following is an extensive property?
(A) temperature
(B) pressure
(C) mass/volume ratio
(D) energy

Answer

Answer: (d)

3. Which of the following represents the largest amount of energy?
(A) 1 electron volt
(B) 1 erg
(C) 1 calorie
(D) 1 joule

Answer

Answer: (c)

4. Which of the following is correct for an adiabatic process?
(A) 𐤃E = q
(B) q = 0
(C) q = +w
(D) P𐤃 V = 0

Answer

Answer: (b)

5. The mixing of gases is generally accompanied by
(A) decrease in entropy
(B) a decrease in free energy
(C) change in heat content
(D) increase in free energy

Answer

Answer: (b)

6. One litre atmosphere is approximately equal o
(A) 101J
(B) 8.314J
(C) 931J
(D) 19.2J

Answer

Answer: (a)

7. The enthalpy change for a given reaction at 298K is -x J/mol. If the reaction occurs spontaneously at 298K the entropy change at that temperature
(A) can be negative but larger than x/298
(B) can be negative but smaller than x/298
(C) cannot be negative
(D) cannot be positive

Answer

Answer: (b)

8. The initial energy change (𐤃U) of a process does not depend upon
(A) amount of substance undergoing the change
(B) temperature
(C) path of the process
(D) nature of substance undergoing the change

Answer

Answer: (c)

9. Vibrational energy is
(A) partial potential and partly kinetic
(B) only potential
(C) only kinetic
(D) neither kinetic nor potential

Answer

Answer: (a)

10. The total entropy change for a system and its surroundings increases if a process is
(A) exothermic
(B) endothermic
(C) reversible
(D) irreversible

Answer

Answer: (d)

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Auto Oxidation and Disproportionation Multiple Choice Questions

MCQs on Auto Oxidation and Disproportionation :

1. Which one of the following will not reduce an acidified solution of potassium dichromate (VI)?
(A) (CH₃)₂C(OH)CH₃
(B) FeSO₄
(C) CH₃CH₂CH(OH)CH₃
(D) Zn

Answer

Answer: (a)

2. 25.4g of iodine and 14.2g of chlorine is made to react completely to yield a mixture of ICl and ICl₃. Calculate the ratio of moles of ICl and ICl₃
(A) 1:1
(B) 1:2
(C) 1:3
(D) 2:3

Answer

Answer: (a)

3. Which of the following has been arranged in order of decreasing average oxidation number of sulphur?
(A) H₂S₂O₇ > Na₂S₄O₆ > Na₂S₂O₃ > S₈
(B) SO₂⁺ > SO₄^2- > SO₃^2- > HSO₄^–
(C) H₂SO₅ > H₂SO₃ > SCl₂ > H₂S
(D) H₂SO₄ > SO₂ > H₂S > H₂S₂O₈

Answer

Answer: (c)

4. The decomposition of KClO₃ to KCl and O₂ on heating is an example of
(A) intermolecular redox change
(B) intramolecular redox change
(C) disproportionation or auto redox change
(D) none of these

Answer

Answer: (b)

5. Disproportionation means
(A) only oxidation
(B) only reduction
(C) both, oxidation and reduction of a reactant
(D) neither oxidation nor reduction

Answer

Answer: (c)

6. The compounds behaving both oxidizing, as well as a reducing agent, is
(A) H₂O₂
(B) SO₂
(C) HNO₂
(D) HNO₃

Answer

Answer: (a,b,c)

7. A substance which can be oxidised as well as reduced easily is
(A) HCl
(B) HClO
(C) HClO₃
(D) HClO₄

Answer

Answer: (b,c)

8. Equivalent mass of oxidising agent in the reaction

SO₂ + 2H₂S → 3S + 2H₂O
(A) 32
(B) 64
(C) 16
(D) 8

Answer

Answer: (c)

9. The oxidation number of iron in Fe₃O₄ is
(A) +2
(B) +3
(C) 8/3
(D) ⅔

Answer

Answer: (a,b)

10. Oxidation numbers of chlorine in Cl₂O, Cl₂ and ClO₃^– are respectively
(A) +1, -1, +5
(B) +1, 0, -1
(C) -1, 0, +1
(D) +1, 0, +5

Answer

Answer: (d)

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MCQs on Aldehydes, Ketones and Carboxylic Acids :

1. A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives
(A) benzyl alcohol + sodium formate
(B) sodium benzoate + methanol
(C) benzyl alcohol + methanol
(D) sodium benzoate + sodium formate

Answer

Answer: (a)

2. Which of the following has the most acidic hydrogen?
(A) hexane-2,4-dione
(B) hexane-2,3-dione
(C) hexane-2,5-dione
(D) hexane-3-one

Answer

Answer: (a)

3. A new C-C bond formation is possible in
(A) cannizzaro reaction
(B) friedel crafts reaction
(C) clemmensen reduction
(D) reimer tiemann reaction

Answer

Answer: (b,d)

4. Under Wolff-Kishner reduction conditions, the conversions which may be brought about are
(A) cyclohexanone into cyclohexane
(B) benzaldehyde into benzyl alcohol
(C) cyclohexanone into cyclohexanol
(D) benzophenone into diphenylmethane

Answer

Answer: (a,d)

5. The formation of cyanohydrin from a ketone is an example of
(A) electrophilic addition
(B) nucleophilic addition
(C) nucleophilic substitution
(D) electrophilic substitution

Answer

Answer: (b)

6. Benzoic acid reacts with conc.HNO₃ and conc.H₂SO₄ to give
(A) o-nitrobenzoic acid
(B) p-nitrobenzoic acid
(C) m-nitrobenzoic acid
(D) o,p-dinitrobenzoic acid

Answer

Answer: (c)

7. An inorganic compound producing an organic compound on heating is
(A) ammonium cyanate
(B) soda lime
(C) sodamide
(D) potassium cyanide

Answer

Answer: (a)

8. The reaction of ethyl formate with an excess of CH₃MgI followed by hydrolysis gives
(A) ethanol
(B) n-propyl alcohol
(C) propanal
(D) isopropyl alcohol

Answer

Answer: (d)

9. Formic acid and acetic acid are distinguished by reaction with
(A) sodium ethoxide
(B) sodium
(C) HgCl₂
(D) 2,4-dinitrophenylhydrazine

Answer

Answer: (c)

10. Heating a mixture of sodium benzoate and soda lime gives
(A) calcium benzoate
(B) benzene
(C) sodium benzoate
(D) methane

Answer

Answer: (b)

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MCQs on Hydrocarbons :

1. Find the correct order of increasing acidity

Answer

Answer: (d)

2. Identify Z in the given reaction:

Answer

Answer: (d)

3. The product obtained on heating 2-Bromopentane with potassium ethoxide in ethanol is
(A) 1-pentene
(B) 2-cis-pentene
(C) trans-2-pentene
(D) 2-ethoxy pentane

Answer

Answer: (c)

4. Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons
(A) hydrolysis
(B) oxidation
(C) cracking
(D) distillation under reduced pressure

Answer

Answer: (c)

5. Which one of the following halide can be used in the Friedel-Crafts reaction?
(A) Isopropyl chloride
(B) Bromobenzene
(C) Chlorobenzene
(D) Chloroethene

Answer

Answer: (a)

6. Which one of the following compound forms salt on reaction with NaNH₂?
(A) C₂H₂
(B) C₂H₆
(C) C₆H₆
(D) C₂H₄

Answer

Answer: (a)

7. Which among the following reagent can be used to distinguish between CH₂BrCH=CH₂ from CH₃CH=CHBr?
(A) Br₂/CCl₄
(B) cold KMnO₄
(C) AgNO₃/C₂H₅OH
(D) Ag(NH₃)₂OH

Answer

Answer: (c)

8. Isopropyl iodide is formed after reaction of propene with HI, this is due to
(A) more stable free radical
(B) homolysis
(C) more stable carbanion
(D) more stable carbocation

Answer

Answer: (d)

9. C₆H₅CHO is formed when C₆H₆ is treated with CO and HCl in the presence of anhydrous AlCl₃. Name of the reaction is:
(A) Friedel crafts reaction
(B) Gattermann Koch reaction
(C) Rosenmund reaction
(D) Stephen reaction

Answer

Answer: (b)

10. A compound having a bond angle 180° is
(A) alkyne
(B) alkane
(C) alkene
(D) cycloalkane

Answer

Answer: (a)

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MCQs on Alkyne :

1. Ethyne and Ethane can be separated from a mixture by passing it through
(A) Pyrogallol
(B) Charcoal powder
(C) Concentrated H₂SO₄
(D) Ammonical Cu₂Cl₂

Answer

Answer: (d)

2. 1-butyne and 2-butyne can be identified by using which of the following reagents?
(A) O₂
(B) Br₂
(C) NaNH₂
(D) HCl

Answer

Answer: (c)

3. Which of the following is used for welding?
(A) CH₄
(B) C₂H₂
(C) C₂H₆
(D) C₂H₄

Answer

Answer: (b)

4. The product formed in the reaction of propyne with dilute H₂SO₄ and HgSO₄ is
(A) Propyl hydrogen sulphate
(B) Propanone
(C) Propanal
(D) Propanol

Answer

Answer: (b)

5. Polymerisation product of propyne is
(A) Benzene
(B) Ethyl benzene
(C) Propyl benzene
(D) Mesitylene

Answer

Answer: (d)

6. The product formed in the reaction of ethyne with dilute H₂SO₄ and Hg²⁺ is
(A) Ethyl hydrogen sulphate
(B) Methoxymethane
(C) Ethanal
(D) Ethanol

Answer

Answer: (c)

7. In the ozonolysis reaction, acetylene forms
(A) Formaldehyde
(B) Glycol
(C) Glyoxal, formic acid
(D) None of the above

Answer

Answer: (c)

8. Acetylene is oxidised by KMnO₄ to form
(A) Acetic acid
(B) Ethyl alcohol
(C) Ethylene glycol
(D) Oxalic acid

Answer

Answer: (d)

9. Find Z in the following reaction
(A) Ethyl bromide
(B) Ethylene bromide
(C) Ethylidene bromide
(D) Ethanol

Answer

Answer: (a)

10. When ethyne is passed through a red hot tube, _______ is formed
(A) Cyclohexane
(B) Neoprene
(C) Benzene
(D) Ethane

Answer

Answer: (c)

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Hydrogen Peroxide Multiple Choice Questions

MCQs on Hydrogen Peroxide :

1. The structure of hydrogen peroxide is
(A) Planar
(B) Spherical
(C) Linear
(D) Non-planar

Answer

Answer: (d)

2. Fenton’s reagent is 
(A) Zn + HCl
(B) Sn + HCl
(C) FeSO₄ + H₂O₂
(D) None

Answer

Answer: (c)

3. Hydrogen peroxide is
(A) oxidising agent
(B) reducing agent
(C) oxidising as well as reducing
(D) None

Answer

Answer: (c)

4. In the disproportionation Hydrogen peroxide, forming H₂O and O₂ its equivalent weight is 
(A) 8.5
(B) 17
(C) 34
(D) 68

Answer

Answer: (c)

5. The gram equivalent weight of H₂O₂ as a reductant is 
(A) 34
(B) 68
(C) 18
(D) 17

Answer

Answer: (d)

6. H₂O₂ cannot oxidise
(A) Na₂SO₃
(B) O₃
(C) PbS
(D) KI/HCl

Answer

Answer: (b)

7. Which of the following contains peroxide linkage?
(A) SO₂
(B) MnO₂
(C) NO₂
(D) BaO₂

Answer

Answer: (d)

8. Which of the following statement is false
(A) H₂O₂ is oxidising
(B) H₂O₂ is reducing
(C) H₂O₂ is basic
(D) H₂O₂ is acidic

Answer

Answer: (c)

9. Which of the following gives hydrogen peroxide on electrolysis?
(A) H₂SO₄
(B) H₂O
(C) HCl
(D) None of the above

Answer

Answer: (a)

10. Acidified potassium permanganate is dropped over sodium peroxide taken in a round bottom flask at room temperature, the vigorous reaction takes place to produce
(A) hydrogen peroxide
(B) a mixture of hydrogen and oxygen
(C) a colourless gas hydrogen
(D) a colourless gas dioxygen

Answer

Answer: (d)