MATRIC • FSC • NTS • ETEA • CSS • PMS etc MCQs Learn, Practice, Prepare, Succeed! Prepare Today, Succeed Tomorrow!

Q: Choose the anisotropic behavior: (ETEA 2017)

A) Coefficient of thermal expansion

B) Lattice energy

C) Viscosity

D) Infrared spectroscopy

Q: The compound with most exothermic lattice energy is: (ETEA 2017)

A) CaCl₂

B) K₂O

C) CaO

D) BaCl₂

Q: All are anisotropic at room temperature except: (ETEA 2018)

A) CCl₄

B) AgNO₃

C) BaCO₃

D) None

Q: At −10 °C which one does NOT show molecular-crystal behavior? (ETEA 2018)

A) Phosphorus

B) Water

C) Sucrose

D) None

Q: The melting point of a crystalline solid upon addition of impurities: (ETEA 2018)

A) Increases

B) Decreases

C) Remains same

D) First decreases then increases

Q: Ice contains H-bonds & covalent bonds. It is a: (ETEA 2019)

A) Ionic

B) Covalent

C) Molecular

D) Metallic

Q: The property necessary to maintain habit of a crystal is called: (ETEA 2019)

A) Crystal lattice

B) Lattice site

C) Geometrical shape

D) Polymorphism

Q: Diamond and graphite are: (ETEA 2019)

A) Isomers

B) Isomorphs

C) Allotropes

D) Both (b) & (c)

Q: Substance with sharp melting point: (ETEA 2019)

A) Gemstone

B) Coal tar

C) Glass

D) Diamond

Q: In the exothermic reaction PCl₃ + Cl₂ → PCl₅, increased yield is favored by: (ETEA 2005)

A) Decrease temperature

B) Increase temperature

C) Keep temperature constant

D) None

Q: For a reversible reaction to reach equilibrium, it must be carried out in: (ETEA 2006)

A) Glass vessel

B) Iron vessel

C) Open vessel

D) Closed vessel

Q: The unit of Kc for 2NO₂ ⇌ N₂O₄ is: (ETEA 2006)

A) Dimensionless

B) Mol dm⁻³

C) Mol dm⁻¹

D) Mol² dm⁻³

Q: The reaction H₂ + I₂ ⇌ 2HI is NOT affected by: (ETEA 2007)

A) Volume

B) Pressure

C) Temperature

D) pH

Q: Kc for N₂O + O₂ ⇌ 2NO is 4×10⁻⁴ at 2000 K. In presence of catalyst, Kc becomes: (ETEA 2007)

A) 10×10⁻⁴

B) 4×10⁻⁴

C) 40×7

D) 4×10²

Q: If Kc is small, it indicates reaction occurs: (ETEA 2007)

A) At low product concentration

B) Only with catalyst

C) At high product concentration

D) None

Q: For 2SO₂ + O₂ ⇌ 2SO₃ + heat, SO₃ yield is maximum if: (ETEA 2008)

A) Pressure↑ Temp↑

B) Pressure↓ Temp↓

C) Pressure↑ Temp↓

D) Pressure↓ Temp↓

Q: For reaction 3O₂ ⇌ 2O₃ (K = 10⁻⁵⁶), we predict: (ETEA 2008)

A) More O₃ forms

B) More reactants consumed

C) Forward reaction dominates

D) Backward reaction nearly complete

Q: A chemical reaction attains equilibrium when: (ETEA 2009)

A) Forward & backward rate equal

B) Reaction takes place

C) Forward & backward stop

D) One reaction faster than other

Q: Value of Kc: (ETEA 2009)

A) Same at different temperatures

B) Different at different temperatures

C) Negligible at room temp

D) Can be same at different temperatures

Q: For CO + H₂O ⇌ CO₂ + H₂, unit of Kc is: (ETEA 2010)

A) Mol L⁻¹

B) L mol⁻¹

C) Dimensionless

D) Mol cm⁻³