Welcome to chemistry afns test 5, a comprehensive online practice module tailored for candidates preparing for the Armed Forces Nursing Services (AFNS) initial entry test. This quiz covers critical FSc Chemistry concepts and high-frequency multiple-choice questions to ensure your preparation for the computer-based test is thorough and effective.

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#1. Q.69 e/m of alpha particles is how many times lesser then a proton?

Almost equal

1.5 times

2 times

4 times

#2. Q.70 For a general reaction aA + bB = cC + dD if ([C]^c[D]^d)/([A]^a[B]^b) > Kc then in which direction the reaction will move…

Forward

Backward

Already in equilibrium

Kc is never less

#3. Q.71 The percentage of co-ordinate covalent bond present in BF4- and NH4+ respectively

25% and 33%

33% each

33% and 25%

25% each

#4. Q.72 If the sharing of an electron pair is unequal and the atom have an electronegativity difference of 1.4 to 1.6…

Ionic

Polar covalent

Non-polar covalent

Metallic

#5. Q.73 The following molecules has linear structure except?

CS2

CO2

SO2

BeCl2

#6. Q.74 Pi bonds are formed by overlapping of

Un-hybrid orbitals

Hybrid and un-hybrid orbitals

Hybrid orbitals

Atomic orbital and hybrid orbital

#7. Q.75 The concept of hybridization was given to remove which of the following drawback (s) of V.B.T

It does not explain paramagnetism of O2

It does not explain odd electron system

It could not explain tetravalency of carbon

All of above

#8. Q.76 Cl2 molecule is formed by the overlap of

s-s orbital

p-p head on overlapping of orbitals

s-p orbital

p-p parallel overlapping of orbitals

#9. Q.77 The process in which the orbitals of different energies and shape mix with each other…

Dissolution

Resonance

Hybridization

Ionization

#10. Q.78 In which of following species central atom is not sp3 hybridized

NH4+

NH2-

NH3

NO3-

#11. Q.79 The experimentally determined bond length of C-Cl is 176.7pm and C-C is 154pm…

22.7pm

99.7pm

176.7pm

330.7pm

#12. Q.80 The structure of Xenon trioxide is shown below, With reference to VSEPR, the shape of XeO3 is:

Tetrahedral

Trigonal pyramidal

Bent (or angular)

Trigonal planar

#13. Q.81 When the concentration of reactant in the reaction is increased by 8 times…

1/3

1/2

#14. Q.82 The rate law of a reaction is, rate = k[A]^2[B]. On doubling the concentration of both A and B…

#15. Q.83 For the reaction A + B -> C + D, doubling the concentration of both the reactants increases the reaction rate by 8 times…

Rate = k[A][B]^2

Rate = k[A][B]

Rate = k[A]^2[B]^2

Rate = k[A]^2[B]

#16. Q.84 The rate of reaction 2X + Y -> Products is Rate = k[X]^2[Y] if X in large excess…

3rd

2nd

1st

0th

#17. Q.85 For the 1st order decomposition reaction 2N2O5(g) -> 2N2O4(g) + O2(g) the half-life is given as

0.693/k

0.693/2k

log2/k

ln2/k

#18. Q.86 The half-life period of zero order reaction is equal to

0.693/K

a/2K

1/Ka

1.5/Ka^2

#19. Q.87 1 mole of ethyl alcohol was treated with one mole of acetic acid at 25°C. 2/3rd of acid changes into ester…

#20. Q.88 At equilibrium, concentration of SO2 is 2M, O2 is 2M and SO3 is 4M. 2SO2 + O2 2SO3…

0.2

#21. Q.89 If Kc value is very small then equilibrium position will shift

Towards left

Towards right

Remains unchanged

It is always constant value

#22. Q.90 The equilibrium expression for a reaction is Kc = x^2 / V(a-x), what is true for this reaction.

Increase of pressure favoured forward reaction

Decrease of pressure favoured forward reaction

Decrease of pressure favoured backward reaction

Increase in volume favoured backward reaction

#23. Q.69 Which one of the following has three structural isomers?

(CH3)3CH

(CH3)2CHCH3

CH3-CH2-CH2-CH3

CH3-CH2-CH2-CH2-CH3

#24. Q.70 C6H5CH3 has

sp2 hybrid orbitals only

sp2 and sp3 hybrid orbitals

sp and sp2 hybrid orbitals

sp2 and 2pz orbitals only

#25. Q.71 The true statement about ethanol and dimethyl ether is

both are polar

ethanol is polar while dimethyl ether is non-polar

both have planar structure

they are chain isomers

#26. Q.72 A and B are two organic compounds: A is aliphatic while B is aromatic, identify A and B

A = C2H4, B = C6H6

A = C2H6, B = C3H8

A = C2H4, B = C2H2

A = C6H6, B = C2H4

#27. Q.73 Alicyclic compounds can be

open chain

aromatic

homocyclic

heterocyclic

#28. Q.74 All are Hydrocarbons except

benzene

naphthalene

cyclohexene

benzoic acid

#29. Q.75 A compound that has closed ring of carbon atoms but lacks alternate double and single bonds is called

Hetero cyclic

Aliphatic

Alicyclic

Aromatic

#30. Q.76 CCl3CHO has the IUPAC name

1, 1, 1 - Trichloroethanal

2, 2, 2 - Trichloroethanal

Trichloro acetaldehyde

1, 1, 1 - Trichloro acetaldehyde

#31. Q.77 Which of the following is not an aromatic hydrocarbon

azulene

Toluene

Chlorobenzene

Ethyl benzene

#32. Q.78 2-methyl propene is an isomer of

1-butene

2-butene

cis-2-butene

all

#33. Q.79 What is true about formyl and carbonyl group

both are found in aldehydes

both are found in ketones

both are terminal functional groups

both have sp2 hybridized carbon

#34. Q.80 A compound with Molecular formula C4H9Cl can’t show

Structural isomerism

Position isomerism

Chain isomerism

Metamerism

#35. Q.81 Which of the following molecules represents the order of hybridization sp2, sp2, sp, sp from left to right atoms?

HC#C - C#CH

CH2 = CH - C#CH

CH2 = CH - CH = CH2

CH3 - CH = CH - CH3

#36. Q.82 Which hydrocarbon on treatment with hot acidified potassium manganate(VII), would give ethanoic acid only

CH3-CH=CH-CH3

CH3-CH2-CH=CH2

(CH3)2C=CHCH3

(CH3)2C=C(CH3)2

#37. Q.83 Alkenes combine readily with electrophilic reagents such as halogens giving

Haloalkanes

Gem dihalides

Vicinal dihalides

Vinyl halides

#38. Q.84 The structure of isobutyl group in an organic compound is

CH3-CH2-CH2-CH2-

(CH3)3C-

(CH3)2CH-CH2-

CH3-CH-CH2-CH3

#39. Q.85 Which nomenclature is not according to IUPAC system?

1-Bromoprop-2-ene

4-Bromo-2,4-dimethylhexane

2-Methyl-3-phenylpentane

5-Oxohexanoic acid

#40. Q.86 Name of the compound given below is

4-ethyl-3-methyloctane

3-methyl-4-ethyloctane

2,3-diethylheptane

5-ethyl-6-methyloctane

#41. Q.87 In which way ethane and propane similar?

They are both obtained by dehydration of alcohols

They are both neutral to an indicator solution

They are both hydrogenated by using a suitable catalyst

They both undergoes polymerization under suitable conditions

#42. Q.88 The complete combustion of alkanes…

#43. Q.90 Ethyl hydrogen sulphate on hydrolysis with boiling water is converted to

Methyl alcohol

Propyl alcohol

Ethyl alcohol

Ethylene

#44. Q.91 The order of dehydration of alcohol is

1° > 2° > 3°

1° > 3° > 2°

2° > 3° > 1°

3° > 2° > 1°

#45. Q.95 Amongst the following, the compound that can be most readily sulphonated is

Toluene

Benzene

Nitrobenzene

Chlorobenzene

#46. Q.96 The nature of -Cl group is

Ortho directing & activator

Meta directing & deactivator

Para directing & deactivator

Ortho and para directing & deactivator

#47. Q.97 When benzene is nitrated…

NO+

NO2-

NO2+

NO2

#48. Q.99 Presence of peroxides affect the addition of:

HBr

HCl

All

#49. Q.100 The compound most likely to decolourise a solution of alkaline KMnO4 is :

CH3-CH3

C10H8

(CH3)4C

CH3CH=CHCH2CH2CH3

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CHEMISTRY TEST 5

Key Topics Covered in Chemistry AFNS Test 5

To achieve top marks in your official AFNS entry exam, make sure to thoroughly revise these foundational chemical domains evaluated in this module:

States of Matter (Gases & Liquids): Gas laws, Dalton’s law of partial pressures, Graham’s law of diffusion, liquid surface tension, and vapor pressure.
Atomic Structure: Discovery of subatomic particles, Bohr’s atomic model, quantum numbers, electronic configuration rules, and isotopic properties.
Chemical Equilibrium: Reversible reactions, the law of mass action, equilibrium constant expressions (Kc and Kp), and Le Chatelier’s principle applications.
Hydrocarbons & Functional Groups: Classification of organic compounds, nomenclature rules, alkane reactivity, and functional group identification.

High-Frequency Sample MCQs for Practice

Test your understanding with these representative MCQs frequently featured in competitive entry examinations:

1. According to Graham’s Law, the rate of diffusion of a gas is inversely proportional to the square root of its:

A) Volume

B) Temperature

C) Density

D) Pressure

Answer: C) Density

2. Which quantum number determines the orientation of an orbital in space?

A) Principal quantum number (n)

B) Azimuthal quantum number (l)

C) Magnetic quantum number (m)

D) Spin quantum number (s)

Answer: C) Magnetic quantum number (m)

3. What happens to the value of the equilibrium constant (Kc) when temperature changes in an endothermic reaction?

A) Kc decreases

B) Kc increases

C) Kc remains unchanged

D) Kc drops to zero

Answer: B) Kc increases

4. The general formula for alkanes is:

A) CnH2n

B) CnH2n+2

C) CnH2n−2

D) CnH2n−6

Answer: B) CnH2n+2

5. Which gas exhibits the most ideal behavior at high temperature and low pressure?

A) Helium

B) Ammonia

C) Carbon dioxide

D) Sulfur dioxide

Answer: A) Helium

Effective Revision Tips for Test 5

Review FSc Fundamentals: Go through core definitions, gas laws, and structural formulas in your 1st-year and 2nd-year FSc Chemistry textbooks.
Analyze Incorrect Attempts: Review every wrong answer after completing the quiz to identify weak areas and clear lingering concepts.
Timed Practice: Complete questions quickly to build confidence, speed, and accuracy for the official computer-based exam.

Useful Resources & Next Steps

Next Quiz: Move forward to practice Chemistry AFNS Test 6.
Main Hub: Access All AFNS Chemistry Practice Quizzes to attempt tests in order.
Official Information: For official entry test dates and registration criteria, visit the Join Pak Army Official Website.

Detailed Overview of Test 5 Preparation

Preparing for chemistry afns test 5 requires a structured approach to solving core problem sets and grasping underlying concepts. This practice test is specifically aligned with the official syllabus set by the selection authorities to mimic the actual testing environment. By repeatedly practicing these questions, you will build familiarity with common question patterns, improve conceptual recall, and develop the mental agility required for timed testing under exam conditions.

BEST OF LUCK FOR YOUR TEST