Description : Which of the following molecules has a dipole moment? w) BF3 x) NH3 y) CCL4 z) CH4
Last Answer : ANSWER: B -- NH3
Description : Which of the following terms refers to the number of molecules or ions attached to a central metallic atom? w) coordination number x) connection number y) bonding number z) none of these
Last Answer : ANSWER: W -- COORDINATION NUMBER
Description : Where are the two lone pairs of electrons of the oxygen atom in an alcohol molecule located? (a) in two p orbitals (b) in two sp orbitals (c) in two sp2 orbitals (d) in two sp3 orbitals
Last Answer : in two sp3 orbitals
Description : How many bonding and non-bonding electron pairs are found in the BF3 molecule? A 1 bonding and 3 non-bonding B 2 bonding and 2 non-bonding C 3 bonding and 1 non-bonding D 3 bonding and 0 non-bonding E 4 bonding and 0 non-bonding
Last Answer : D 3 bonding and 0 non-bonding
Description : What two atomic orbitals or hybrid atomic orbitals overlap to form the carbon-carbon σ bond in ethyne? (a) sp3–sp3 (b) sp2–sp2 (c) s–s (d) sp–sp
Last Answer : sp–sp
Description : Compound in which carbons use only sp3 hybrid orbitals for bond formation is (a) CH3CH2CH3 (b) CH3C≡CH (c) CH3CH=CH2 (d) CH2=CH—CH=CH2
Last Answer : CH3CH2CH3
Description : What bond angle is associated with sp3 (read: S - P - hybrid orbitals?
Last Answer : ANSWER: 109.5 DEGREES
Description : Which of the following describes the orientation of bonds in an sp3 hybridized atom? w)triagonal x)linear y)tetrahedral z)planar
Last Answer : ANSWER: Y -- TETRAHEDRAL
Description : sp3 Why is the angle between hybrid orbitals 109 degrees 26 ' ?
Last Answer : : A s orbital and three p orbitals of the conjugate layer overlap and form a sp3 hybrid orbital. The balanced sp3 orbital is directed along the four angles of any regular tetrahedron. And between the orbitals the angle 109 ৮ 26 ' is present and the structure is quadratic.
Description : Which of the following molecules does NOT have a dipole moment of zero? w) BeCl2 x) BF3 y) CO2 z) NH3
Last Answer : ANSWER: Z -- NH3
Description : In which of the following central atom makes use of `sp^(3)` hybrid orbitals
Last Answer : In which of the following central atom makes use of `sp^(3)` hybrid orbitals A. `SO_(2)` B. `SO_(3)` C. `H_(2)S` D. `H_(2)O`
Description : Which of the following species contains three bond pairs and one lone pair around the central atom? (1) PCl3 (2) H2O (3) BF3 (4) NH2
Last Answer : PCl3
Description : 13. Which one of the following pairs is isostructural (i.e. having the same shape and hybridization)? (1) 4 4 [BF and NH ] (2) 3 3 [BCl and BaCl ] (3) 3 3 [NH and NO ] (4) [NF3 and BF3 ] Sol: [1] In both the compounds, central atom i
Last Answer : (1) 4 4 [BF and NH ]
Description : Consider the following gaseous equilibrium: PCl3 + Cl2 = PCl5 + heat. Which of the following changes will shift it to the right: w) lower the temperature x) remove some Cl2 y) increase the volume z) add a catalyst
Last Answer : ANSWER: W -- LOWER THE TEMPERATURE
Description : The structure of an ammonia molecule can best be described as: w) linear x) tetrahedral y) pyramidal z) triagonal planar
Last Answer : ANSWER: Y -- PYRAMIDAL
Description : Pyridine is less basic than trimethylamine because the lone-pair of electrons on N-atom in pyridine resides in (a) sp2 hybrid orbital (b) sp hybrid orbital (c) sp3 hybrid orbital (d) p-orbital
Last Answer : sp2 hybrid orbita
Description : Triethylamine [(CH3CH2)3N] is a molecule in which the nitrogen atom is __________ hybridized and the CNC bond angle is __________. (a) sp2; >109.5° (b) sp2; 109.5° (d) sp3;
Last Answer : sp3;
Description : The N–H bond in the ammonium ion, NH4+, is formed by the overlap of what two orbitals? (a) sp3–sp3 (b) sp3–sp2 (c) sp2–sp2 (d) sp3–s
Last Answer : sp3–s
Description : What orbitals overlap to create the H–C bond in CH3+? (a) sp3–sp3 (b) sp2–sp3 (c) s–p (d) s–sp2
Last Answer : s–sp2
Description : The nuclei of heavy atoms generally contain: w) more electrons than neutrons x) more protons than electrons y) more neutrons than electrons z) more orbitals than electrons
Last Answer : ANSWER: Y -- MORE NEUTRONS THAN ELECTRONS
Description : Pi bonds are formed by the overlap of: w) unhybridized p orbitals x) sp2 hybridized orbitals y) sp hybridized orbitals z) unhybridized s orbitals
Last Answer : ANSWER: W -- UNHYBRIDIZED P ORBITALS
Description : In the filling of electron orbitals for the elemen sulfur, which has 16 electrons, the number of electrons in the 3p orbitals is: w) 3 x) 4 y) 6 z) 0
Last Answer : ANSWER: X -- 4
Description : Which of the following molecules has a permanent electric dipole moment? w) H2O x) Cl2 y) CH4 z) N2
Last Answer : ANSWER: W -- H2O
Description : Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6
Last Answer : ANSWER: Y -- NaCl
Description : Which of the following four compounds would have t most ionic bond? w) CH4 x) LiF y) CsF z) N2
Last Answer : ANSWER: Y -- CsF
Description : Which of the following compounds has the lowest boiling points? w) CH4 x) CCl4 y) PH3 z) PCl3
Last Answer : ANSWER: W -- CH4
Description : Which of the following compounds has the highest boiling point? w) CH4 x) CCL4 y) HI z) IF5
Last Answer : ANSWER: Z -- IF5
Description : Which of the following terms refers to the energy released when an electron is added to a neutral atom? w) electrovalence x) electron affinity y) electroconductance z) none of these
Last Answer : ANSWER: X -- ELECTRON AFFINITY
Description : Point group D3h belong to the molecule a. BF3 b. NH3 c. CHCl3 d. CH3
Last Answer : a. BF3
Description : The boiling points of the halogens increase going from F2 to I2. What type of intermolecular forces are responsible for this trend? w) permanent dipole x) hydrogen bonding y) ion-ion attraction z) London dispersion forces
Last Answer : ANSWER: Z -- LONDON DISPERSION FORCES
Description : In which of the following compounds is the bonding most covalent? w) NaCl x) F2 y) MgS z) Fe3C
Last Answer : ANSWER: X -- F2
Description : In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a hybrid layer by chemically reacting the intertubular dentin. 3. a hydrophilic ... a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4
Last Answer : b. 1,4
Description : Which of the following terms denotes the polar molecules or negative ions clustered about a central positive ion? w) ligands x) isomers y) complex ions z) dipoles
Last Answer : ANSWER: W -- LIGAND
Description : The species in which the cantral atom uses `sp^(2)` hybrid orbital in its bonding is:
Last Answer : The species in which the cantral atom uses `sp^(2)` hybrid orbital in its bonding is: A. `PH_(3)` B. `NH_(3)` C. `CH_(3)^(+)` D. `SbH_(3)`
Description : Are all the five bonds in PCl5 molecule equivalent ?
Last Answer : Ans – PCl5 has a trigonal bipyramidal structure and the three equatorial p-cl bonds are equivalent . while trhe two axial bonds are different and longer than equatorial bonds.
Description : The action of concentrated sulfuric acid on sugar best described as: w) catalysis x) oxidation y) reduction z) dehydration
Last Answer : ANSWER: Z -- DEHYDRATION
Description : In which of the folowing molecules, vacant orbitals do not participate in bonding :-
Last Answer : In which of the folowing molecules, vacant orbitals do not participate in bonding :- A. `B_(2)H_(6)` B. `Al_(2) ... H_(3)N.BF_(3)]` D. `Si_(2)H_(6)`
Description : The angle between the bonding orbitals of a molecules `AX_(3)` with zero dipole moment is
Last Answer : The angle between the bonding orbitals of a molecules `AX_(3)` with zero dipole moment is A. `120^(º)` B. `109^(º)` C. `104^(º)` D. `180^(º)`
Description : Which of the following statements about benzene is correct? (a) All of the carbon atoms are sp3 hybridized. (b) It has no delocalized electrons. (c) The carbon-carbon bond length is longer than that of ethane. (d) It is a planar molecule.
Last Answer : It is a planar molecule.
Description : The ‘N’ atom in pyridine is (a) sp3 hybridized (b) sp2 hybridized (c) sp hybridized (d) cannot be predicted
Last Answer : sp2 hybridized
Description : What is the hybridization of the carbon atom in CH3NH2? (a) 3sp3 (b) sp (c) sp2 (d) sp3
Last Answer : sp3
Description : What is the hybridization of the nitrogen atom in CH3NH2? (a) sp (b) sp2 (c) sp3 (d) s-sp3
Description : The carbon atom of a carbonyl group is (a) sp hybridized (b) sp2 hybridized (c) sp3 hybridized (d) None of these
Description : What is the hybridization of the oxygen atom in CH3CH2OH? (a) sp (b) 4sp3 (c) sp2 (d) sp3
Description : Which of the following is not correct concerning substitution and elimination reactions of alkyl halides? (a) The electrophile replaces the leaving group. (b) Compounds containing electron-donating groups bonded to an ... replaced by another atom or group in substitution reactions. (d) (a) and (b)
Last Answer : (a) and (b)
Description : Compare the following complexes’ with respect to structural shapes of units, magnetic behaviour and hybrid orbitals involved in units : (i) [Ni(CN)4]2- (ii) [NiCl4]2- (iii) [CoF6]3- [At. Nos. : Ni = 28; Co = 27] -Chemistry
Last Answer : (i) [Ni(CN)4]2- Shape : Octahedral outer orbital complex Hybridisation : sp3d2 Magnetic behaviour : Paramagnetic (4 unpaired electrons)
Description : Compare the following complexes with respect to structural shapes of units, magnetic behaviour and hybrid orbitals involved in units : [Co(NH3)6]+3, [Cr(NH3)6]3+, Ni(CO)4 (At. nos. : Co = 27, Cr = 24, Ni = 28) -Chemistry
Last Answer : (i) [Co(NH3)6]+3 → Octahedral shape, d2sp3 hybridisation, diamagnetic Formation of [Co(NH2)6]+3 → oxidation state of Co is +3.
Description : Compare the following complexes with respect to their shape, magnetic behaviour and the hybrid orbitals involved : (i) [CoF4]2- (ii) [Cr(H2O)2(C2O4)2]– (iii) [Ni(CO)4] (Atomic number : Co = 27, Cr = 24, Ni = 28) -Chemistry
Last Answer : (i) [COF4]2_ : Tetrafluorido cobalt (III) ion Coordination number = 4 Shape = Tetrahedral Hybridisation = sp3 Important Questions for Class 12 Chemistry Chapter 9 Coordination Compounds Class 12 Important Questions 7
Description : For the complex [Fe(en)2Cl2], Cl, (en = ethylene diamine), identify (i) the oxidation number of iron, (ii) the hybrid orbitals and the shape of the complex, (iii) the magnetic behaviour of the complex, (iv) ... an optical isomer also, and (vi) name of the complex. (At. no. of Fe = 26) \ -Chemistry
Last Answer : i) [Fe(en)2Cl2] Cl or x + 0 + 2 (-1) + (-1) = 0 x + (- 3) = 0 or x = + 3 ∴ Oxidation number of iron, x = + 3 (ii) The complex has two bidentate ligands and two ... )2Cl2] Cl, only cis-isomer shows optical isomerism. (vi) Name of complex: Dichloridobis (ethane-1, 2- diamine) Iron (III) chloride
Description : The bond angles associated with the hybrid orbitals of a carbon involved in a triple bond is (a) 180° (b) 120° (c) 109° (d) 45
Last Answer : 180