TS EAMCET Chemical Bonding and Molecular Structure — practice questions
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Practice TS EAMCET Chemical Bonding and Molecular Structure in the app →What is the shape of a molecule whose central atom is $sp^3$ hybridised and has no lone pairs (e.g. $\mathrm{C
What is the hybridisation of the central P atArrange the bond angles of $\mathrm{H_2O}$, $\mathrm{NH_3}$ and $\mathrm{CH_4}$ in decreasing order.Which of the following molecules has a **non-zero** dipole moment?Using molecular orbital theory, the bond order of the $\mathrm{O_2}$ molecule is:According to the octet rule, atoms achieve stability by attaining an outer shell configuration of:The number of valence electrons in the Lewis dot symbol of nitrogen is:In the Lewis structure of CO₃²⁻, the total number of valence electrons to be accounted for is:For the NH₄⁺ ion, the total valence electrons available for writing the Lewis structure is:In a Lewis structure, the formal charge on an atom is calculated as:Which of the following compounds is an example of *incomplete* octet of the central atom?Which of the following is most likely to have the greatest covalent character (Fajans' rules)?Among H–H, F–F, Cl–Cl, Br–Br, I–I, the bond length is shortest for:The average O–H bond enthalpy in water is calculated from the two stepwise dissociation values (502 and 427 kJAmong the following, which molecule has zero net dipole moment?One Debye unit (1 D) is equivalent to:According to VSEPR theory, the order of repulsion between electron pairs is:The shape of a molecule of type AB₄ (no lone pair on A), e.g., CH₄, is:The shape of SF₄ is:The shape of ClF₃ is:XeF₄ adopts which geometry?Which of the following overlaps is positive (gives bonding)?A sigma (σ) bond is formed by:In sp hybridisation, each hybrid orbital has the following s and p character:In BeCl₂ (gaseous), the central Be is sp-hybridised. The molecular geometry and Cl–Be–Cl bond angle are:The hybridisation of the central atom and shape of NH₃ are:Hybridisation of the central atom in PCl₅ is:The hybridisation of S in SF₆ is:The hybridisation of each carbon in ethyne (C₂H₂) is:According to MO theory, the bond order in a molecule is:The paramagnetism of O₂ is explained by MO theory because the molecule has:The bond order in N₂, O₂ and O₂²⁻ (peroxide) are respectively:A hydrogen bond is formed when an H atom is covalently bonded to:Which of the following is an example of *intramolecular* hydrogen bonding?Isoelectronic species N₂, CO and NO⁺ all have a bond order of:An ELECTROVALENT (ionic) bond is formed when:A COVALENT bond is formed by:The octet rule states atoms tend to:VSEPR stands for:The shape of methane (CH₄) is:Water (H₂O) molecular shape is:Bond order in N₂ molecule is:Dipole moment of CO₂ is:In NH₃, hybridization of N is:BF₃ has shape:In SF₆, central S has hybridization:The order of bond strength: single < double < triple. Bond LENGTHS go in:Bond angle in NH₃ compared to H₂O:Molecule with linear shape (besides CO₂):Number of σ and π bonds in C₂H₄ (ethene):Bond order from MOT (molecular orbital theory):Among NaCl, HCl, H₂O — order of bond polarity:Lattice energy of an ionic crystal depends on:Hybridization in PCl₅ (gaseous phosphorus pentachloride):XeF₄ has shape:In benzene C₆H₆, each C is:Number of π bonds in HCN:Among HF, HCl, HBr, HI: order of bond ENTHALPY (strength):Effective nuclear charge (Z_eff) felt by an electron in 2p orbital of nitrogen, given Z = 7, screening constanAmong NaCl, NaBr, NaI: order of melting points:According to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = Atoms that combine to gain eight valence electrons are following which rule?Which scientist introduced the term covalent bond?Formal charge compares free-atom valence electrons with what?Among possible Lewis structures, which one is usually lowest in energy?Which molecule has more than eight electrons around its central atom?The van der Waals radius is half the distance between which atoms?Which ion has the same bond order as the F2 molecule?Which species is isoelectronic with N2 and shares its bond order of 3?How are the two oxygen-oxygen bond lengths in ozone best described?How does a resonance hybrid's energy compare with its canonical forms?Which statement about a molecule showing resonance is correct?What is the O-C-O bond angle in the carbonate ion?In which molecule is the shared electron pair attracted equally by both atoms?Dipole moment is the product of which two quantities?In the chemist's crossed-arrow dipole symbol, where does the arrowhead sit?VSEPR theory is also named after which two chemists?In which year did Gillespie and Nyholm refine the VSEPR idea into a theory?What molecular geometry does xenon tetrafluoride, XeF4, have?Why is the H-O-H angle in water smaller than the tetrahedral 109.5°?In AXE notation, ammonia, NH3, is which type of molecule?Iodine heptafluoride, IF7, has which base geometry?Which geometry do the five bonding pairs of PCl5 adopt?Molecular Li2O is linear, not bent, mainly because its bonds are what?What bond angle does the nitronium ion, NO₂⁺, have?Who developed hybridisation theory in 1931 to explain methane?What percentage s character does each sp3 hybrid orbital have?In ethylene, the carbon-carbon pi bond comes from which overlap?How many pi bonds join the two carbon atoms in ethyne, C2H2?A molecule whose molecular orbitals are all doubly occupied is what?In MO theory, bond order is half the difference between which counts?Why does a stable He2 molecule not exist?Which homonuclear diatomic molecule does MO theory predict cannot exist?In the C2 molecule, what makes up the double bond?O2 has 10 bonding and 6 antibonding electrons. What is its bond order?How many unpaired electrons does an O2 molecule have?Hydrogen bonding is strongest when hydrogen is bonded to which atoms?Which common cation in ionic compounds is not derived from a metal?The octet rule applies mainly to elements of which period?Which is a known drawback of the octet theory of bonding?Which molecule breaks the octet rule by having an odd number of electrons?Which two chemists developed the VSEPR theory in 1957?In VSEPR theory, valence electron pairs around an atomHow does VSEPR theory count a double bond on the central atom?What is the steric number of a central atom?Sulfur in SF4 has four ligands and one lone pair. What is its steric number?Why is the H–O–H angle in water 104.5° and not 109.5°?In VSEPR theory, which repulsion is the strongest?NH3 has three bond pairs and one lone pair. Its electron pairs are arranged