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Q: When zinc electrode is coupled with copper in a galvanic cell: (ETEA 2019)

A) Reduction takes place at zinc electrode

B) Oxidation takes place at copper electrode

C) Reduction takes place at copper electrode

D) Both (a) & (b)

Q: Zinc and copper electrodes are connected for galvanic cell and salt bridge is also immersed in both half-cells. The salt bridge will give cation to: (ETEA 2019)

A) Copper half-cell

B) Zinc half-cell

C) Both (a) & (b)

D) None of the above

Q: The oxidation number of carbon in Mg(HCO₂)₂ is: (ETEA 2018)

A) +

B) -4

C) -2

D) 0

Q: The oxidation state of nitrogen in NH₄NO₂ is: (ETEA 2019)

A) -3 and +5

B) +5 and +3

C) -3 and -3

D) 0

Q: Which of the following pairs of molecules have similar geometry? (Entry test 2005)

A) CO₂ and SO₂

B) BF₃ and NH₃

C) MgCl₂ and AlCl₃

D) CH₄ and SiH₄

Q: What happens to the molecules when its atoms are brought closer than the bond length between them? (Entry test 2005)

A) Molecule becomes unstable

B) Molecule becomes more stable

C) Molecule starts vibrating

D) Stability of the molecule remains unchanged

Q: What type of hybrid orbitals are used by the carbon atoms in C₂H₄? (Entry test 2005)

A) SP

B) SP²

C) D²SP³

D) SP³

Q: The longest bond is of: (Entry test 2008)

A) H–I

B) H–O

C) H–S

D) H–Cl

Q: Which one of the following is an electron-deficient compound? (Entry test 2008)

A) NH₃

B) PH₃

C) PCl₃

D) BCl₃

Q: What types of bonds are present in NH₄Cl? (Entry test 2008)

A) Ionic

B) Covalent

C) Coordinate covalent

D) All of these

Q: CO₂ is iso-structural with: (Entry test 2009)

A) HgCl₂

B) SnCl₂

C) C₂H₂

D) NO₂

Q: Species in which the central atom uses sp hybrid orbital in its bonding is: (Entry test 2009)

A) PH₃

B) NH³

C) SbH₃

D) C₂H₂

Q: The bond form between boron and hydrogen is: (Entry test 2010)

A) Ionic

B) Covalent

C) Coordinate covalent

D) None of these

Q: What causes a sharp increase in energy with a further decrease in the distance between atoms A and B after bond formation? (Entry test 2010)

A) Attraction of atoms A and B

B) Repulsion of nuclei and electrons of A and B

C) Attraction of nucleus of A and electron of B

D) Bond formation

Q: During the formation of a chemical bond between two atoms, the forces which are operative are: (Entry test 2010)

A) Both forces of attraction and repulsion

B) Either force of attraction or repulsion

C) Only force of attraction

D) Only force of repulsion

Q: Which of the following hybridizations can explain the shape of BeCl₂? (Entry test 2012)

A) sp³ hybridization

B) sp hybridization

C) sp² hybridization

D) dsp² hybridization

Q: How many sigma bonds are there in CH₂=CH–CH=CH₂? (Entry test 2012)

A) 6

B) 9

C) 11

D) 4

Q: What is the bond order in F₂ molecule according to molecular orbital theory? (Entry test 2013)

A) 2

B) 3

C) 1

D) 4

Q: Which one of the following compounds has the shortest carbon–halogen bond? (Entry test 2013)

A) CH₃F

B) CH₃Cl

C) CH₃Br

D) CH₃I

Q: Oxygen molecule has two unpaired electrons. It is therefore: (Entry test 2013)

A) Ferromagnetic

B) Diamagnetic

C) Electromagnetic

D) Paramagnetic