NEET 2018 PRACTISE PAPER PHYSICAL CHEMISTRY

NEET 2018 PRACTISE PAPER-THERMO,EQUILIBRIUM,BONDING AND

STATE OF MATTER BY DR SUDHIR TOMAR

Q1.How are bond length and bond energies related?

A)The higher the bond energy, the longer the bond length

B)They are not related

C)The higher the bond energy, the shorter the bond length

D)The lower the bond energy, the shorter the bond length

Q2.Which type of bonding would be expected between S and Cl?

A)Polyionic B)Polar covalent C)Ionic D)Non-polar covalent

Q3. The molecule having one unpaired electron is:

A)CO B)CN^-

C)NO₂ D)O

Q4. The ion that isoelectronic with CO is

A) N₂⁺B)O₂^-

C)O₂⁺D)CN^-

Q5. Molecular structure of SF₆ is

A. linear

B. tetrahedral

C. hexagonal

D. octahedral

Q6. In Al₂Cl₆, number of electron pairs donated by each Chloride ion are

A. 1

B. 2

C. 3

D. 4

Answer B

Q7. Number of bonding pairs of electrons in water H₂O is

A. 1

B. 2

C. 3

D. 4

Answer B

Q8. Which statement is incorrect?

A. boiling point is independent of number of contact points

B. boiling point depends upon number of electrons

C. boiling point depends upon number of protons

D. boiling point is dependent on number of neutrons

Q9. PH of buffer solution depends upon concentration of

A. acid (H⁺-)

B. conjugate base (-OH^-)

C. salt

D. both A and B

Answer D

Q10. Carminic acid gives purple color with

A. acids (H⁺-)

B. alkalis (-OH^-)

C. weak acids (H⁺-)

D. all of them

Answer B

Q11. PH can be kept constant with help of

A. saturated solution

B. unsaturated solution

C. buffer solution

D. super saturated solution

Answer C

Q12. In an unsaturated solution, concentration of each ion of sparingly soluble salt at 298k tells us the

A. solubility product

B. solubility reactant

C. dynamic equilibrium

D. solubility equilibrium

Answer A

Q13.. System of reaction in which no reactant leaves reaction mixture is termed as

A. open system

B. closed system

C. semi-open system

D. partially closed system

Answer B

Q14. On description of proton, new classification of acid and base was given by

A. J.bronsted

B. T.lowry

C. J.Dalton

D. both A and B

Answer D

Q15. A substance which neutralizes a base is called

A. acid

B. alkali

C. alkaloid

D. halogen

Answer A

Q16. Reactions in which products cannot turn back into reactants are termed as

A. irreversible reactions

B. reversible reactions

C. equilibrium reactions

D. redox reactions

Answer A

Q17. Real gases do not react as expected

A. ideal gas

B. noble gas

C. non-ideal gas

D. inert gas

Answer A

Q18. Force of attraction and repulsion in gaseous molecule is

A. present

B. absent

C. slight

D. huge

Answer B

Q19. Silicon D. oxide which is found in mineral quartz is very similar to

A. graphite

B. diamond

C. iron

D. copper

Answer B

Q20. Metal which can be melted even by warmth of human palm is

A. gallium

B. indium

C. aluminum

D. tungsten

Answer A

Q21. Volume occupied by 0.5 mole of carbon dioxide at a pressure of 150kPa and at temperature of 19 °C will be

A. 8.09 dm3

B. 8.89 dm3

C. 9.09 dm3

D. 8.13 dm3

Answer A

Q22. Standard enthalpy change of combustion occurs when 1 mol of substance is burnt in excess of

A. nitrogen

B. oxygen

C. carbon dioxide

D. helium

Answer B

Q23. Enthalpy changes which cannot be found by calorimeter can be found by help of

A. Newton's Law

B. Hess's Law

C. Krebs's Law

D. Ohm's Law

Answer B

Q24. Amount of energy required to break a specific covalent bond is called

A. bond dissociation energy

B. bond energy

C. bond enthalpy

D. All of Above

Answer D

Q25. Exothermic enthalpy changes are shown as

A. negative values

B. positive values

C. neutral

D. constant

Answer A

Q26. Change in enthalpy when 1 mol of compound is formed under standard conditions is called

A. reaction

B. formation

C. combustion

D. neutralization

Answer B

Q27. Many ionic compounds have some covalent ability due to

A. ion polarization

B. charge polarization

C. proton polarization

D. electron polarization

Answer A

Q28. Ionic radius of cation will be smaller and more efficient in polarizing

A. carbonate ion

B. carbonate molecule

C. hydrogen ion

D. water

Answer A

Q29. Lithium Fluoride

A. lesser

B. greater

C. same

D. never known

Answer A

Q30. Degree of polarization depends on

A. charge density of cations

B. polarisability

C. charge density of anions

D. both A and B

Answer D

Q31. Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.

A. [NF₃ and BF₃ ] B. [BF₄ ^–and NH₄ ⁺ ]

C. [BCl₃ and BrCl₃ ] D. [NH3 and NO₃ ^– ]

Q32. The types of hybrid orbitals of nitrogen in NO₂ ⁺ , NO₃^– and NH₄ ⁺ respectively are expected to be

A. sp, sp³ and sp² B. sp, sp² and sp³

C. sp², sp and sp³ D. sp² , sp³ and sp

Q33. Hydrogen bonds are formed in many compounds e.g., H₂O, HF, NH₃ . The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is :

A. HF > H₂O > NH₃ B. H₂O > HF > NH₃

C. NH₃ > HF > H₂O D. NH₃ > H₂O > HF

Q34. In PO₄ ^3– ion the formal charge on the oxygen atom of P–O bond is

A. + 1 B. – 1

C. – 0.75 D. + 0.75

Q35. In NO₃ ^– ion, the number of bond pairs and lone pairs of electrons on nitrogen atom are

A. 2, 2 B. 3, 1

C. 1, 3 D. 4, 0

Q36. Which of the following species has tetrahedral geometry?

A. BH₄ ^– B. NH₂^–

C. CO₃ ^2– D. H₃O ⁺

Q37. Number of π bonds and σ bonds in the following structure is–

A. 6, 19 B. 4, 20

C. 5, 19 D. 5, 20

Q38. Which molecule/ion out of the following does not contain unpaired electrons?

A. N₂ ⁺ B. O₂

C. O₂ ^2– D. B₂

Q39. Which of the following options represents the correct bond order :

A. O₂ ^– > O₂ > O₂ ⁺ B. O₂^– < O₂ < O₂ ⁺

C. O₂ ^– > O₂ < O₂ ⁺ D. O₂ ^–< O₂ > O₂ ⁺

Q40. The electronic configuration of the outer most shell of the most electronegative element is

A. 2s²2p⁵ B. 3s²3p⁵

C. 4s²4p⁵ D. 5s²5p⁵

Q41. Which of the following statements are not correct?

A. NaCl being an ionic compound is a good conductor of electricity in the solid state.

B. In canonical structures there is a difference in the arrangement of atoms.

C. Hybrid orbitals form stronger bonds than pure orbitals.

D. VSEPR Theory can explain the square planar geometry of XeF₄ .we

Q42. Match the species in Column I with the geometry/shape in Column II.

Column I Column II

A. H₃O ⁺ (a) Linear

B. HC ≡ CH (b) Angular

C. ClO₂^– (c) Tetrahedral

D. NH₄ ⁺ (d) Trigonal bipyramidal

(e) Pyramidal

Q43. Match the species in Column I with the bond order in Column II.

Column I Column II

A. NO (a) 1.5

B. CO (b) 2.0

C. O₂^– (c) 2.5

D. O₂ (d) 3.0

Q44. Match the items given in Column I with examples given in Column II.

Column I Column II

A. Hydrogen bond (a) C

B. Resonance (b) LiF

C. Ionic solid (c) H₂

D. Covalent solid (d) HF

(e) O₃

Q45. Match the shape of molecules in Column I with the type of hybridisation in Column II.

Column I Column II

A. Tetrahedral (a) sp²

B. Trigonal (b) sp

C. Linear (c) sp³

Q46. Assertion (A) : Though the central atom of both NH₃and H₂O molecules are sp³ hybridised, yet H–N–H bond angle is greater than that of H–O–H.

Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.

(A) A and R both are correct, and R is the correct explanation of A.

(B) A and R both are correct, but R is not the correct explanation of A.

(D) A and R both are false.

Q47. Assertion (A): Among the two O–H bonds in H₂O molecule, the energy required to break the first O–H bond and the other O–H bond is the same.

Reason (R) : This is because the electronic environment around oxygen is the same even after breakage of one O–H bond.

(A) A and R both are correct, and R is correct explanation of A.

(B) A and R both are correct, but R is not the correct explanation of A.

(D) A and R both are false.

Q48.On converting 25 °C, 38 °C and 66 °C to kelvin scale, the correct answer will be (A) 298 K, 311 K and 339 K (B) 298 K, 300 K and 338 K

Q49. Choose the correct statement of the following

(A) conversion of solid into vapours without passing through the liquid state is called vapourisation.

(B) conversion of vapours into solid without passing through the liquid state is called sublimation.

(D) conversion of solid into liquid is called sublimation.

Q50. Rusting of an article made up of iron is called

(A) corrosion and it is a physical as well as chemical change

(B) dissolution and it is a physical change

(D) dissolution and it is a chemical change

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