A coordiante bond is a dative covalent bond. Which of the below is true?

• Three atom form bond by sharing their electrons

• Two atom form bond by sharing their electrons

• Two atoms form bond and one of them provides both electrons

• Two atoms form bond by sharing electrons obtained from third atom

The number of antibonding electron pairs in ${\mathrm{O}}_2^{2-}$ molecular ion on the basis of molecular orbital theory is

• 2

• 3

• 4

• 5

Which of the following is isostructural with CO₂ ?

• N₂O

• NO₂

• N₂O₅

• NO

Structure of ammonia is

• pyramidal

• tetrahedral

• trigonal

• trigonal pyramidal

345.

Which of the following contains both covalent and ionic bond ?

• CCl₄

• CaCl₂

• NH₄Cl

• H₂O

The bond energy is the energy required to

• dissociate one mole of the substance

• dissociate bond in 1 kg of the substance

• break one mole of similar bonds

• break bonds in one mole of substance

Geometry of ${\mathrm{SiO}}_4^{4-}$ anion is

• tetrahedral

• trigonal

• trihedral

• pentagonal

Chlorine (Cl¹⁷) free radical contains how many electrons around the nucleus?

• 16

• 17

• 18

• 19

The atomic number of Sn is 50. The shape of gaseous SnCl₂ molecule is

• Cl-Sn-Cl

• 

• 

• 

The central carbon atom of a free radical contains

• 6 electrons

• 7 electrons

• 8 electrons

• 10 electrons