Tiêu đề 04. CHEMICAL BONDING AND MOLECULAR STRUCTURE.pdf ✅

PAPER 1 (1.) The maximum covalency of p -block elements is equal to : (1) the number of unpaired p-electrons (2) the number of paired d-electrons (3) the number of unpaired s and p-electrons (4) total number of unpaired electron in ground state or in excited state (2.) Hybridization of carbon in CO3 2 is : (1) sp (2) 2 sp (3) 3 sp (4) 3 sp d (3.) Which have non fractional bond order : (1) O2 + (2) O2 (3) NO (4) H2 + (4.) Which has non zero value of dipole moment : (1) XeF4 (2) CHCl3 (3) CO2 (4) (5.) An ionic bond A B+ − is most likely to be formed when: (1) the ionization energy of A is high and the electron affinity of B is low (2) the ionization energy of A is low and the electron affinity of B is high (3) the ionization energy of A and the electron affinity of B is high (4) the ionization energy of A and the electron affinity of B is low (6.) Which of the following compounds of elements in group IV is expected to be most ionic ? (1) PbCl2 (2) PbCl4 (3) CCl4 (4) SiCl4 (7.) The hydration of ionic compounds involves : (1) Evolution of heat (2) Weakening of attractive forces (3) Dissociation into ions (4) All of these (8.) In which of the following species the bonds are nondirectional : (1) NCl3 (2) RbCl (3) BeCl2 (4) BCl3 (9.) Most ionic compounds have : (1) high melting points and low boiling points (2) high melting points and nondirectional bonds (3) high solubilities in nonpolar solvents and low solubilities in polar solvents
(4) three-dimensional network structures, and are good conductors of electricity in the solid state (10.) A sigma bond may be formed by the overlap of 2 atomic orbitals of atoms A and B . If the bond is formed along as the x -axis, which of the following overlaps is acceptable ? (1) s orbital of A and z p orbital of B (2) x p orbital of A and y p orbital of B (3) z p orbital of A and x p orbital of B (4) x p orbital of A and s orbital of B (11.) No X X − bond exists in which of the following compounds having general form of X H2 6 ? (1) B H2 6 (2) C H2 6 (3) Si H2 6 (4) None (12.) Which of the following has a geometry different from the other three species ? (1) BF4 − (2) 2 SO4 − (3) XeF4 (4) PH4 + (13.) Maximum bond energy is in : (1) F2 (2) N2 (3) O2 (4) equal in all (14.) Among the following species, identify the isostructural pairs : NF , NO ,BF ,H O ,HN 3 3 3 3 3 − + (1) NF , NO 3 3 −     and BF ,H O 3 3 +     (2) NF ,HN 3 3  and NO , BF 3 3 −     (3) NF , H O 3 3 +     and NO , BF 3 3 −     (4) NF , H O 3 3 +     and HN ,BF 3 3  (15.) Number and type of bonds between two carbon atoms in 2 C2 − are : (1) one sigma ( ) and one pi ( ) bond (2) one  and two  bonds (3) one  and one and a half  bond (4) one  bond (16.) In the context of carbon, which of the following is arranged in the correct order of electronegativity : (1) 2 3 sp sp sp   (2) 3 2 sp sp sp   (3) 2 3 sp sp sp   (4) 3 2 sp sp sp   (17.) The shapes of 5 IF and 7 IF are respectively : (1) square pyramidal and pentagonal bipyramidal . (2) octahedral and pyramidal (3) trigonal bipyramidal and linear (4) distorted square planar and distorted octahedral (18.) Carbon atoms in C (CN) 2 4 are :

(1) NH Cl 4 (2) HCN (3) H O2 2 (4) CH4 (30.) Molecular shapes of SF ,CF ,XeF 4 4 4 are : (1) the same with 2, 0 and 1 lone pairs of electrons respectively (2) the same with 1, 1 and 1 lone pairs of electrons respectively (3) different with 0, 1 and 2 lone pairs of electrons respectively (4) different with 1, 0 and 2 lone pairs of electrons respectively (31.) In which of the following only  -bonds are present: (1) N3 − (2) C2 (3) H O3 + (4) NO+ (32.) In *  molecular orbitals : (1) 2 nodal planes are present (2) 1 nodal plane is present (3) No nodal planes is present (4) 3 nodal planes are present (33.) In which of the following hybridisation of central elements is 2 sp and  -bonds are formed by p p   − and p d   − overlaping : (1) SO3 9 (2) 2 HPO3 − (3) ClO2 + (4) All of these (34.) Both BF3 and NF3 are covalent compound. BF3 is non polar compound but NF3 is polar. The reason is : (1) Boron is a solid and nitrogen is a gas in free state (2) Boron is a metalloid while nitrogen is non metal (3) BF3 is planar but NF3 is pyramidal in shape (4) Atomic size of boron is smaller than that of nitrogen (35.) Which of the following species does not follow octate rule : (1) CH4 (2) PCl5 (3) CO2 (4) SiCl4 (36.) Identify the incorrect statement. (1) There are two  and one  bond in N2 . (2) The hybridisation of oxygen in H O2 is 3 sp (3) Solid NaCl is a bad conductor of electricity. (4) NaCl get easily hydrolyes (37.) Which among the following compound does not show hydrogen bonding : (1) Phenol (2) Ethyl alcohol (3) Acetic acid (4) Diethyl ether (38.) In which of the following lattice energy dominates over hydration energy : (1) BeSO4 (2) NaCl (3) KHCO3 (4) BaSO4