PBlock and haloalkanes

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

Nitrogen is obtained from liquid air when it is liquified at

• 200^oC

• -200^oC

• 100^oC

• -100^oC

• a

• b

• c

• d

• a

• b

• c

• d

• a

• b

• c

• d

• a

• b

• c

• d

• a

• b

• c

• d

• a

• b

• c

• d

• a

• b

• c

• d