Chemistry Small Quiz before sem exam

Which is not the way for the atoms of group 16 elements become stable?

• by gaining two electrons

• by losing two electrons

• by sharing two electrons

• by sharing four electrons

Elements in the same group of Periodic Table have the same......

• physical properties

• number of valence electrons

• number of electrons

• electron configuration

The electron-dot structure of the element nitrogen is shown in the figure below. In which group of the periodic table does nitrogen exist?

• Group 1

• Group 3

• Group 5

• Group 15

Which of the following ions is the largest?

• O^2-

• F^-

• N^3-

• Li⁺

Which is not the factors affecting ionisation energy

• spin-pair repulsion

• Shielding effect

• Atomic size

• electronegativity

Boron has lower ionisation energy than Beryllium due to

• Spin-pair repulsion

• electron removed is further away from nucleus

• Greater nuclear charge

• larger shielding effect

Which statement is correct?

• Cℓ has a relative isotopic mass of 35.5

• Cℓ₂ has a relative molecular mass of 70.

• ICℓ has a relative molecular mass of 162.4.

• NaCℓ has a relative molecular mass of 58.5.

NH₃ is polar molecules due to different electronegativity between N and H.

• TRUE

• FALSE

Possible bond angle of F-S-F in SF₄.

• 120^o

• 90^o

• 115^o

• 125^o

At high pressure, most of the gases behave non-ideal. Why?

• significant intermolecular forces

• insignificant intermolecular forces

• high volume at high pressure

• low volume at high pressure