Group 15th

down the group + 5 is highly stable due to inert pair effect

• true

• false

The maximum covalency of nitrogen is

• 3

• 4

• 5

The largest bond angle is in

• AsH3

• NH3

• H2O

• PH3

Oxidation state of ”P” in H₃PO₄ is

• a. +2

• b.+5

• c.+6

• d.+7

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

• P ortibal

• S orbital

• d orbital

• None of the above

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

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

• Ammonia

• Phosphine

• Arsine

• Bismuthine

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

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

Which has highest boiling agent

• NH3
• PH3
• AsH3
• BiH3