BONDING ASSAIGNMENT

CHEMISTRY Dr.Avvari Suresh Q.1 Compare the bond angle– (A) BF3, NF3, PF3, ClF3 Q.2 Bond order of is more than CO Why ? Q.3 Compare the bond length of – (A) N – O (B) C – O (C) C – Mg (D) C – H Q.4 All the angles of BrCl5 are equal but not of PCl5. Expalin. Q.5 SF6 is octahedral but XeF6 is distorted octahedral why ? Q.6 All the bond distances of Al(CH3)3 are not equal ? Q.7 Which process involve the breaking of bond. (A) Boiling of H2S (B) Melting of KCN (C) Melting of SiO2 (D) Boiling of CF4 Q.8 Bond strength order of -H – H, H3C – CH3, F – F bond Q.9 In BF3 – NH3 compound both BF3 /NH3 are in ‘sp3’ hybridization. Explain. Q.10 AgF is soluble in water while AgBr is not. Why ? Q.11 Which of the following has strongest bonds – HF, HCl, HBr, HI Q.12 Arrange N2, O2, F2, Cl2 in increasing order of bond dissociation energy. Q.13 Arrange NO2+, , in order of increasing N – O bond length. Q.14 In ethene all carbon are in sp2 hydradization but angle between H – C – H is smaller (118°) than the angle H – C = C (121°) why ? Q.15 Water molecule can be represent by H9+ O4. What is its structure. Q.16 Which of the following have a bond angle of approximately 90° ? H2O, H2S, NH3, CH4 Q.17 Which among the following has lowest bond length. O2, O2–2, O2–2, O2+Q.18 Why BeF2 is more stable than BF2. Q.19 in I3–1 is 180° although its hybradization sp3d. Q.20 Why repulsion between non bonded orbital is more than the bonded orbitals ? Q.21 The following compounds have been arranged in order of their increasing thermal stability -K2CO3 (I) MgCO3(II) CaCO3(III) BeCO3(IV) Q.22 Which has triangular planer shape -(A) (B) (C) H3+O (D) ClO3–1 Q.23 In which compound all the bond angles are exactly 109°28¢ (A) Chloroform (B) Iodoform (C) Chloro methane (D) Carbon tetrachloride Q.24 Is B2 molecule paramagnetic or diamagnetic. Discuss ? Q.25 Discuss the hybridization and shape of allene. Q.26 Bond energy of I – Cl bond is nearly half the bond energy of H – Cl. Explain. Q.27 All the C – C bonds in compound C2(CN)4 are of equal strength or not. Discuss. Q.28 Which substance would be expected to exibit the greatest surface tension at 25°C. (A) CH3 – O – CH3 (B) C2H5 – OH (C) CH3 – CH – (OH) – CH3 (D) HO – CH2 – CH2 – OH Q.29 Strongest bond is formed by the head on over lapping of – (A) 2s – 2p orbital (B) 2p – 2p orbital (C) 2s – 2s orbital Q.30 Which bond has the highest bond energy – (A) Co-ordinate bond (B) Sigma bond (C) Multiple bond (D) Polar covalent bond Q.31 What is the bond angle of H – B – H in BH4–. Q.32 The process requiring the absorption of energy is – (A) F ® F–1 (B) H ® H–1 (C) Cl ® Cl–1 (D) O ® O–2 Q.33 Heterolytic clearage requires more energy than homolytic cleavage. Q.34 What is the structure of ICl2–1. Q.35 Which pair represents isostructural species -(A) NH4+ and CH3+ (B) NH4+ and NH3 (C) SO42– and BF4 (D) NH2– and BeF2 Q.36 Which is paremagnetic (A) Cl2O6 (B) Cl2O7 (C) Cl2O (D) ClO2 Q.37 Give the electronic configurtion and name of element which is iso electronic with H2O. Q.38 Which can be described as a molecule with residual bonding capacity -(A) N2 (B) CH4 (C) NaCl (D)BeCl2 Q.39 Element silicon does not form a graphite like structure as carbon does. Why ?