p-Block Elements - group 15 elements

Pnictogens are

• Group 15 elements

• Group 16 elements

• Group 17 elements

• Group 18 elements

P-block elements are those elements in which last electron enters in

• P ortibal

• S orbital

• d orbital

• None of the above

Maximum covalency of nitrogen is

• 6

• 8

• 9

• 4

Nitrogen is chemically inert. Why?

• Due to presence of double bond require more energy to break

• Due to presence of triple bond require more energy to break

• Triple bond requires less energy to break

• None of the above

Bismuth forms stable compound in +3 state than in +5 state . Why?

• Inert pair effect

• Ortho effect

Ammonia is liquid phosphene gas . Why?

• Due to more molar mass ammonia has maximum vanderwall force of attraction

• Due to more molar mass , ammonia has less vander wall force of attraction

• Due to presence of inter molecular hydrogen bonding in ammonia

• Due to absence of hydrogen bonding in ammonia

Nitrogen cannot exhibit co valancy more than four due to

• Presence of vacant d orbitals

• Due to large size

• Due to absence of vacant d orbitals

• Due to inert nature

Among the hydrides of 15th group , which is strong reducing agent?

• Ammonia

• Phosphine

• Arsine

• Bismuthine

Ammonia is a Lewis base and act as complexing agent.

• It accepts electron pair

• It is neither electron pair donar or acceptor

• It act as electron pair donar.

• It exhibit covalency more than five

Which of the following pair behaves as strongest and weakest base hydride respectively NH₃, PH₃, AsH₃;,

SbH₃, BiH₃ ?

• (a) NH₃, PH₃;

• (b) NH₃, BiH₃

• (c) PH₃, BiH₃

• (d) BiH_3, AsH₃