In B2H6 :- (a)There is a direct boron-boron bond (b)The boron atoms are linked through hydrogen atoms

KCl is an ionic compound it does not contain covalent bond.

(a) Total number of candles = 15 × 12 × 39 = 7020

b. Remove/Replace 3' OH group in deoxy ribose

Bond order (b.o.) is defined as one half the difference between the number of electrons present in the bonding and the antibonding orbitals i.e., Bond order (b.o.) = ½ (Nb–Na)  Bond...

H2O—Covalent  B2H6- Covalent  NaH- Ionic

H2O(Covalent, electron rich) , B2H6 (Covalent Hydride, electron deficient),NaH( ionic hydride).

one molecule of water is bonded by hydrogen bond and is deeply embedded in the lattice, While four molecules are bonded with coordinate bond.  Cu(H2O)4] SO4.H2O

a) Diborane is a colourless, highly toxic gas with a Boiling Point of 180K.  b) Diborane catches fire spontaneously upon exposure to air.

a) Aluminium

(d) The income earners.