Problem 18
An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is (1) 11 (2) 16 (3) 18 (4) 10
Problem 19
Born-Haber cycle is used to determine (1) lattice energy (2) electron affinity (3) tonisation energy (4) any of these
Problem 20
According to Fajan, covalent character of a compound is more when there are (1) small cations and large anion (2) small cations and small anion (3) large cations and large anion (4) large cations and small anion
Problem 23
Among \(\mathrm{NaP}, \mathrm{NaCl}, \mathrm{NaBr}\) and \(\mathrm{Nal}\), the \(\mathrm{NaF}\) has highest melting point because (1) It has maximum ionic character. (2) It has minimum ionic character. (3) It has associated molecules. (4) It has least molecular weight.
Problem 24
Amongst \(\mathrm{LiCl}, \mathrm{RbCl}, \mathrm{BcCl}_{2}\) and \(\mathrm{MgCl}_{2}\) the compounds with the greatest and least ionic character respectively arc (1) \(\mathrm{LiCl}\) and \(\mathrm{RbC} 1\) (2) \(\mathrm{RbCl}\) and \(\mathrm{BeCl}_{2}\) (3) \(\mathrm{RbC} 1\) and \(\mathrm{MgCl}_{2}\) (4) \(\mathrm{MgC}_{2}\) and \(\mathrm{BeCl}_{2}\)
Problem 25
The three-dimensional graph of lattice points which sets the pattern for the whole lattice is called (1) unit cell (2) crystal lattice (3) simple latticc (4) space lattice
Problem 26
Favourable conditions for ionic bond are (1) low charge on ions, large cation and small anion (2) high charge on ions, small cation and large anion (3) high charge on ions, large cation and small anion (4) low charge on ions, small cation and large anion
Problem 27
Coordination number of Na ion in \(\mathrm{NaCl}\) is 6 and that of cacsium ion in CsCl is 8 . This is because (1) IP of \(\mathrm{Cs}\) is less than \(\mathrm{Na}\) (2) Size of \(\mathrm{Na}^{\prime}\) is less than \(\mathrm{Cs}\) (3) Attraction of \(\mathrm{Na}\) is higher than \(\mathrm{Cs}^{\prime}\) (4) None
Problem 29
Which set has the strongest tendency to form anions? (1) \(\mathrm{Ga}, \ln , \mathrm{Te}\) (2) \(\mathrm{Na}, \mathrm{M} \mathrm{g}, \mathrm{As}\) (3) \(\mathrm{N}, \mathrm{O}, \mathrm{F}\) (4) \(\mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\)
Problem 32
Octet rule is not valid for the molecule (1) \(\mathrm{CO}_{2}\) (2) \(\mathrm{H}_{2} \mathrm{O}\) (3) \(\mathrm{O}_{2}\) (4) CO
