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 Equilibrium State Multiple Choice Questions

MCQs on Equilibrium State :

1. Equimolar solutions of the following compounds are prepared separately in water. Which will have the lowest pH value?
(A) BeCl₂
(B) SrCl₂
(C) CaCl₂
(D) MgCl₂

Answer

Answer: (a)

2. Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution?
(A) NH₄Cl
(B) Al₂(SO₄)₃
(C) AgNO₃
(D) NaCN

Answer

Answer: (d)

3. In some solutions, the concentration of H₃O⁺ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as
(A) ideal solution
(B) colloidal solution
(C) true solution
(D) buffer solution

Answer

Answer: (d)

4. All compounds are in equilibrium in a reversible reaction. If reactants are doubled in concentration the equilibrium constant would be
(A) reduced to half its original value
(B) reduced to one-fourth of its original value
(C) doubled
(D) constant

Answer

Answer: (d)

5. The solubility of Fe(OH)₃ would be maximum in
(A) 0.1M NaOH
(B) 0.1M HCl
(C) 0.01M KOH
(D) 0.1M H₂SO₄

Answer

Answer: (d)

6. Which of the following sulphides has the largest value of Ksp?
(A) CuS
(B) CdS
(C) PbS
(D) ZnS

Answer

Answer: (d)

7. According to Le Chatelier’s principle adding heat to a solid and liquid in equilibrium will cause the
(A) amount of solid to decrease
(B) amount of liquid to decrease
(C) temperature to rise
(D) temperature to fall

Answer

Answer: (a)

8. 0.1M solution of which of the substances will be basic?
(A) sodium borate
(B) ammonium chloride
(C) calcium nitrate
(D) sodium sulphate

Answer

Answer: (a)

9. At a certain temperature 2HI ⥨ H₂ + I₂ only 50% HI is dissociated at equilibrium. The equilibrium constant is
(A) 0.25
(B) 1.0
(C) 3.0
(D) 0.6

Answer

Answer: (a)

10. Which has the highest degree of ionization?
(A) 0.1M NH₃
(B) 0.001M NH₃
(C) 0.1M NH₃
(D) 0.0001M NH₃

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 Electrovalent Bonding Multiple Choice Questions

MCQs on Electrovalent Bonding :

1. Electrovalent compounds are
(A) low melting
(B) insoluble in polar solvents
(C) conductors in the fused state
(D) none of the above

Answer

Answer: (c)

2. Ionic compounds don’t conduct electricity in
(A) solution
(B) fused state
(C) solid state
(D) none of the above

Answer

Answer: (c)

3. When an element of very low ionization potential reacts with an element of very high electron affinity
(A) a covalent bond is formed
(B) an electrovalent bond is formed
(C) a metallic bond is formed
(D) no bond is formed

Answer

Answer: (b)

4. The bond between two atoms of the same element is
(A) polar covalent bond
(B) ionic bond
(C) non-polar covalent bond
(D) none of the above

Answer

Answer: (c)

5. The percentage of ionic character of a bond is calculated by the difference in
(A) size of atoms
(B) ionization potential of atoms
(C) electronegativity of atoms
(D) atomic volumes of atoms

Answer

Answer: (c)

6. In which of the following C-C bond length is least?
(A) benzene
(B) diamond
(C) ethylene
(D) acetylene

Answer

Answer: (d)

7. The paramagnetic nature of oxygen molecule is explained by
(A) Valence bond theory
(B) Heitler London theory
(C) Hund Mulliken theory
(D) none of the above

Answer

Answer: (c)

8. The bonds present in CuSO₄.5H₂O are
(A) electrovalent and coordinate
(B) covalent and coordinate
(C) electrovalent and covalent
(D) electrovalent, covalent and coordinate

Answer

Answer: (d)

9. An element having 4 electrons in its outermost orbit forms bond by
(A) losing electrons
(B) gaining electrons
(C) sharing electrons
(D) any of the above

Answer

Answer: (c)

10. Elements with electronegativities 1.2 and 3.0 form
(A) electrovalent bond
(B) covalent bond
(C) coordinate bond
(D) metallic bond

Answer

Answer: (a)

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 Alcohols, Phenols and Ethers Multiple Choice Questions

MCQs on Alcohols, Phenols and Ethers :

1. Benzenediazonium chloride on reaction with phenol in weakly basic medium gives
(A) diphenyl ether
(B) p-hydroxyazobenzene
(C) chlorobenzene
(D) Benzene

Answer

Answer: (b)

2. Phenol reacts with bromine in CS₂ at low temperature to give
(A) m-bromophenol
(B) o-and p-bromophenol
(C) p-bromophenol
(D) 2,4,6-tribromophenol

Answer

Answer: (b)

3. When phenol is treated with excess bromine water it gives
(A) m-bromophenol
(B) o- and p-bromophenol
(C) 2,4-dibromophenol
(D) 2,4,6-tribromophenol

Answer

Answer: (d)

4. Phenol on reduction with H₂ in the presence of Ni catalyst gives
(A) benzene
(B) toluene
(C) cyclohexane
(D) Cyclohexanol

Answer

Answer: (d)

5. Dehydration of alcohol is an example of
(A) addition reaction
(B) elimination reaction
(C) substitution reaction
(D) redox reaction

Answer

Answer: (b)

6. The compound obtained by the reaction of ethene with diborane followed by hydrolysis with alkaline H₂O₂ is
(A) ethanol
(B) propanol
(C) ethanol
(D) triethyl bromide

Answer

Answer: (a)

7. Which of the following is formed when phenol is exposed to air?
(A) o-Benzoquinone
(B) p-Benzoquinone
(C) Phenoquinone
(D) o-and p-Benzoquinone

Answer

Answer: (d)

8. Which of the following is formed when glycerol is heated with oxalic acid at 503K?
(A) Glyceric acid
(B) Acrolein
(C) Allyl alcohol
(D) Methanoic acid

Answer

Answer: (c)

9. The alcohol which does not react with Lucas reagent is
(A) isobutyl alcohol
(B) n-butanol
(C) tert-butyl alcohol
(D) sec-butyl alcohol

Answer

Answer: (b)

10. Phenol is less acidic than
(A) acetic acid
(B) p-methoxyphenol
(C) p-nitrophenol
(D) Ethanol

Answer

Answer: (a,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 Some Basic Concepts of Chemistry Multiple Choice Questions

MCQs on Some Basic Concepts of Chemistry :

1. Elements X and Y combine to form two compounds XY and X₂Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X₂Y is 9g
(A) 30, 20
(B) 80, 20
(C) 60, 40
(D) 20, 30

Answer

Answer: (b)

2. Which one will have maximum numbers of water molecules?
(A) 18 molecules of water
(B) 1.8 grams of water
(C) 18 grams of water
(D) 18 moles of water

Answer

Answer: (d)

3. The number of atoms present in 0.1 moles of a triatomic gas is
(A) 1.806 × 10²³
(B) 1.806 × 10²²
(C) 3.600 × 10²³
(D) 6.026 × 10²²

Answer

Answer: (a)

4. Find the volume of O₂ required to burn 1 L of propane completely, measured at 0℃ temperature and 1 atm pressure
(A) 10 L
(B) 7 L
(C) 6 L
(D) 5 L

Answer

Answer: (d)

5. A gas X has C_p and C_v ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms
(A) 1.2 × 10²³
(B) 3.01 × 10²³
(C) 2.01 × 10²³
(D) 6.02 × 10²³

Answer

Answer: (d)

6. Which of the species is not paramagnetic?
(A) As⁺
(B) Cl^–
(C) Ne²⁺
(D) Be⁺

Answer

Answer: (b)

7. Pressure has the same dimension as ____________
(A) energy per unit volume
(B) energy
(C) force per unit volume
(D) force

Answer

Answer: (a)

8. A container has an equal mass of H₂, O₂ and CH₄ at 27℃, the ratio of their volume is
(A) 16:8:1
(B) 8:1:2
(C) 16:1:2
(D) 8:16:1

Answer

Answer: (c)

9. There are two chlorides of sulphur S₂Cl₂ and SCl₂. What is the equivalent mass of S in SCl₂
(A) 64.8 g/mole
(B) 32 g/mole
(C) 16 g/mole
(D) 8 g/mole

Answer

Answer: (c)

10. Boron exists as two stable isotopes; ¹⁰B(19%) and ¹¹B(81%). Find out the average atomic weight of boron in the periodic table
(A) 10.0
(B) 11.2
(C) 10.2
(D) 10.8

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 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)