chemistry test 9 - PAK ARMED FORCES TEST

QUIZ START

Results

PASSED!

FAIL!

QUIZ START

#1. Which sub-shell has the highest energy?

n=5,l=3,m=+1

n=5,l=2,m=+2

n=4,l=3,m=0

n=4,l=0,m=+1

#2. Magnetic quantum number values for the d-subshell are

#3. A p-orbital has ______ energy than an s-orbital of the same principal quantum number.

Lower

Higher

Equal

Variable from orbit to orbit

#4. In gases and liquids, temperature is the measure of the kinetic energies of molecules:

Average translational

Rotational

Vibrational

All of these

#5. The molar volume of nitrogen gas is maximum at:

25°C and 1 atm

0°C and 2 atm

130°C and 1 atm

100°C and 2 atm

#6. 8g of methane and 2g of hydrogen are mixed and kept at 760 mm pressure at 273 K. The total volume occupied by the mixture will be:

11.2 dm³

22.4 dm³

33.6 dm³

44.8 dm³

#7. Which of the following has the strongest intermolecular forces?

Hydrogen (H₂)

Chlorine (Cl₂)

Iodine (I₂)

Methane (CH₄)

#8. What type of force exists between ions and water molecules?

Dipole-induced dipole forces

Ion-dipole forces

Dipole-dipole forces

London dispersion forces

#9. Which forces are present between all types of atoms and molecules?

Hydrogen bonding

Dipole-dipole forces

London dispersion forces

Dipole-induced dipole forces

#10. Ionic solids are characterized by:

Low melting point

Good conductivity in solid state

High vapor pressure

Solubility in polar solvent

#11. Which solids are called true solids?

Metallic

Amorphous

Crystalline

Vitreous

#12. Which ionic solid has highest lattice energy

LiCl

NaCl

KCl

CsCl

#13. Which of the following is NOT a state function?

Pressure

Volume

Heat

Internal Energy

#14. A state function is a property that:

Depends on the path taken to reach a state

Has definite values for initial and final states

Is constantly changing

Is irrelevant to thermodynamics

#15. The total energy of a system is called:

Enthalpy

Kinetic Energy

Internal Energy

Potential Energy

#16. According to the first law of thermodynamics:

Energy can be created but not destroyed

Energy can be destroyed but not created

Energy can neither be created nor destroyed

The total energy of the universe is decreasing

#17. Internal energy (E) change is equal to

Heat (q) - Work (w)

Heat (q) / Work (w)

Heat (q) + Work (w)

Heat (q) * Work (w)

#18. In the equation ΔE = q – PΔV, what does PΔV represent?

Change in internal energy

Heat absorbed by the system

Pressure-volume work

Change in enthalpy

#19. Which of the following statement about atomic radius is generally TRUE across a period from left to right in the periodic table?

It increases

It decreases

It remains constant

Random

#20. Which factor is primarily responsible for the increase in atomic radius down a group in the periodic table?

Increase in effective nuclear charge.

Increase in the number of valence electrons.

Increase in electron-electron repulsion.

Increase in the number of electron shells.

#21. For isoelectronic species, what is the relationship between ionic radius and nuclear charge?

Directly proportional

Inversely proportional

Independent

None of these

#22. How does atomic radius generally change as you move from left to right across a period in the periodic table?

It increases

It decreases

It remains constant

Random behaviour

#23. Covalent radius is typically defined as half the distance between the nuclei of two identical atoms joined by a:

Triple covalent bond.

Single covalent bond.

Ionic bond.

Metallic bond.

#24. Anion is always larger than its parent atom because ___.

it has more protons.

the effective nuclear charge increases.

it has more electrons.

it has more neutrons

#25. Which of the following blocks in the periodic table primarily contains transition elements?

s-block

p-block

d-block

f-block

#26. The general electronic configuration for the valence shell of d-block transition elements is:

(n-1)s² np⁶

(n-1)d¹⁻¹⁰ ns¹⁻²

ns² np⁶

nf¹⁻¹⁴ ns²

#27. Which of the following electronic configurations represents a d-block element?

[Ne] 3s² 3p⁵

[Ar] 4s²

[Ar] 3d⁵ 4s¹

[Kr] 5s² 5p³

#28. For the reaction: 4NH3+5O2 ⇌ 4NO+6H2O The units of the equilibrium constant (Kc) are:

Concentration (Conc.)

Concentration² (Conc.²)

Concentration⁻¹ (Conc.⁻¹)

No units

#29. One mole of HI was sealed in a tube and heated at 440°C until equilibrium was reached. If HI was found to be 50% dissociated, the equilibrium constant Kc for the reaction is:

0.5

0.25

0.625

#30. For what value of Kc is the forward reaction almost complete?

10³⁰

10⁻³⁰

Finish