Q.1
Which of the following statement is not true for diborane
  • a) When methylated it produces Me4B2H2
  • b) All bond length B-H are equal
  • c) Two boron atoms and four terminal hydrogen atoms lie in same plane
  • d) Two bridging hydrogen atoms lie symmetrically above and below the plane of formed by B and Four H
Q.2
Boron compounds behave as Lewis acid because of their ....
  • a) Acidic nature
  • b) Electron deficiency
  • c) Ionic property
  • d) Smaller size
Q.3
Treatment of concentrated solution of borax with calculated quantity of H2SO4 gives
  • a) H3BO3
  • b) H2B4O7
  • c) HBO2
  • d) B2O3
Q.4
When powdered borax is heated strongly in Bunsen-flame it gives...
  • a) B2O3
  • b) NaBO2
  • c) B2O3 + NaBO2
  • d) Na2B4O7
Q.5
Anhydrous AlCl3 is prepared from ... [ MP CET 1998]
  • a) Concentrated HCl and Al metal
  • b) Aluminium and Cl2
  • c) Dry HCl and heated Al metal
  • d) Dil HCl and Al metal
Q.6
BF3 molecule has planar structure . Correct explanation for this is ...
  • a) BF3 is sp3 hybridised
  • b) BF3 is sp2 hybridised
  • c) BF3 is sp hybridised
  • d) BF3 spd2 hybridised
Q.7
Which of the element have highest melting point/
  • a) B
  • b) Al
  • c) Ga
  • d) Tl
Q.8
Which of the following statement is not correct? Boron differs from the other members of the group because..
  • a) has much lower atomic radius
  • b) is a non metal
  • c) Has a maximum covalency 6
  • d) is covalent in all its compound
Q.9
The bond angle Cl - B - Cl in BCl3 is
  • a) 60°
  • b) 109° 7'
  • c) 120°
  • d) 90°
Q.10
Which of the following is used in high temperature thermometry?
  • a) Hg
  • b) Ga
  • c) Ca
  • d) Sn
Q.11
hich of the following reaction is not shown by both "B" and "Al"
  • a) They react with HCl to form chloride
  • b) They burn in oxygen to give give oxide at higher temperature
  • c) Their halides are Lewis acids
  • d) They combine with nitrogen to form nitride
Q.12
Which of the following is a Lewis acid?
  • a) PCl3
  • b) AlCl3
  • c) TiCl3
  • d) NCl3
Q.13
Which of the following is most abundant in earth's crust
  • a) Na
  • b) Ca
  • c) Al
  • d) C
Q.14
Thermite is a mixture of iron oxide and
  • a) Zinc powder
  • b) Aluminium powder
  • c) Copper metal
  • d) Sodium metal
0 h : 0 m : 1 s