Free MCQs & Online Quiz Practice for Exams

Q: A heat engine takes in 800 J of heat at 1000 K and exhausts 600 J of heat at 400 K. What is the actual efficiency of this engine?

A) 25%

B) 40%

C) 50%

D) 75%

Q: If the temperature of the heat source is increased, the efficiency of a Carnot engine:

A) Increases

B) Decreases

C) Remains constant

D) First increases then becomes constant

Q: Triple point of water is:

A) 273.16°F

B) 372.16 K

C) 373.16°F

D) 273.16 K

Q: A real gas can be approximated to an ideal gas at:

A) Low density

B) High pressure

C) High density

D) Low temperature

Q: If the volume of a gas is to be increased by 4 times then:

A) Temperature and pressure must be doubled

B) At constant P the temperature must be increased by four times

C) At constant T the pressure must be increased by four times

D) It cannot be increased

Q: In which of the systems listed below is the entropy decreasing?

A) A gas is cooled

B) A plate is shattered

C) An egg is scrambled

D) A drop of dye diffuses in a cup of water

Q: If the temperatures of the source and sink of a Carnot engine having efficiency η are each decreased by 100 K, then the efficiency η:

A) remain constant

B) become 1

C) Increase

D) decreases

Q: The diamagnetic ion is:

A) Ni²⁺

B) Cr³⁺

C) Mn²⁺

D) Cu⁺

Q: Potassium ferrocyanide is a:

A) Normal salt

B) Mixed salt

C) Double salt

D) Complex salt

Q: The co-ordination compound [CuCl₄]²⁻ exists in the shape of:

A) Tetrahedral

B) Octahedral

C) Square planar

D) Rhombic

Q: The oxidation state of chromium in CrO₂Cl₂ is:

A) +2

B) +3

C) +4

D) +6

Q: [BeF₄]²⁻ is an example of a:

A) Square planar

B) Tetrahedral complexes

C) Bent structure

D) Octahedral

Q: Which of the following is a typical transition element?

A) Zn

B) Cd

C) Ra

D) Co

Q: The paramagnetic nature of a substance depends on:

A) The number of electrons in the outermost orbit

B) The number of electrons that are easily ejected

C) The number of unpaired electrons

D) The number of lone pairs of electrons

Q: Ligands are:

A) Electron-pair donors

B) Electron-pair acceptors

C) Always neutral

D) Both donor and then acceptor

Q: Which one is not ferromagnetic?

A) Fe

B) Co

C) Sb

D) Ni

Q: The coordination number of iron in [Fe(CN)₆]⁴⁻ is:

A) 9

B) 3

C) 4

D) 6

Q: Select the ligand which is bidentate:

A) H₂O

B) NH₃

C) CO

D) C₂O₄²⁻

Q: Cu²⁺ salt solution is blue in colour due to transition of electron from:

A) s → p orbital

B) d → d orbital

C) p → d orbital

D) p → p orbital

Q: Electronegativity of Be is approximately equal to that of:

A) Al

B) Mg

C) B

D) Ar