21.

Which among the following is an electron deficient compound ?

• NF₃

• PF₃

• BF₃

• AsF₃

Which of the following does not have a lone pair on the central atom ?

• NH₃

• PH₃

• BF₃

• PCl₃

What is the nature of the bond between B and O in (C₂H₅)₂OBH₃ ?

• Covalent

• Co - ordinate covalent

• Ionic bond

• Banana shaped bond

K₂HgI₄ is used to test the following :

• NH₄⁺

• Cl

• Br

• I

Radioactive metal is :

• Li

• Ce

• Na

• Ra

Geometrical isomerism is found in :

• pentene - 1

• pentane

• 2 - butene

• butene - 1

Following pair is separated by yellow ammonium sulphide :

• CdS , Bi₂S₁

• Bi₂S₃ , PbS

• PbS , HgS

• CdS , Ag₂S₃

Following is estimated by Liebig method :

• C and H

• N₂

• Cl₂

• Br₂

Inorganic graphite is :

• BN

• BF₃

• B₂H₆

• none of these

What is the product of the reaction of H₂O₂ with Cl₂ ?

• O₂ + HOCl

• HCl + O₂

• H₂O + HCl

• HCl + H₂