Uncategorized 4. Chemical bonding and Structure – MCQ September 5, 2020September 5, 2020 Shveta 0 Comments chemical bonding and structure, ibdp chemistry What is the formula for the compound formed by calcium and nitrogen? CaNCa2NCa2N3Ca3N22. Element X is in group 2, and element Y in group 7, of the periodic table. Which ions will be present in the compound formed when X and Y react together? X+ and Y–X 2+ and Y– X+ and Y2–X2– and Y+3. Based on electronegativity values, which bond is the most polar?B―CC―ON―OO―F4. Which substance is most soluble in water (in mol dm–3) at 298 K? CH3CH3CH3OCH3CH3CH2OHCH3CH2CH2CH2OH5. Which molecule is linear?SO2CO2H2SCl2O 6. According to VSEPR theory, repulsion between electron pairs in a valence shell decreases in the orderlone pair-lone pair > lone pair-bond pair > bond pair-bond pair.bond pair-bond pair > lone pair-bond pair > lone pair-lone pair.lone pair-lone pair > bond pair-bond pair > bond pair-lone pair.bond pair-bond pair > lone pair-lone pair > lone pair-bond pair.7. What type of solid materials are typically hard, have high melting points and poor electrical conductivities? I. Ionic II. Metallic III. Covalent-networkI and II onlyI and III only II and III onlyI, II and III8. What is the formula of the compound formed when aluminium reacts with oxygen?Al3O2Al2O3AlO2AlO39. Which compound has the highest boiling point? CH3CH2CH3CH3CH2OHCH3OCH3CH3CHO10. How many electrons are used in the carbon-carbon bond in C2H2?46101211. Which statement is true for compounds containing only covalent bonds?They are held together by electrostatic forces of attraction between oppositely charged ions.They are made up of metal elements only.They are made up of a metal from the far left of the periodic table and a non-metal from the far right of the periodic table.They are made up of non-metal elements only.12. Which combination of DHvaporization and boiling point is the result of strong intermolecular forces? ABCD13. What is the shape of the CO32– ion and the approximate O–C–O bond angle?Linear, 180° Trigonal planar, 90°Trigonal planar, 120°Pyramidal, 109°14. The compounds listed have very similar molar masses. Which has the strongest intermolecular forces?CH3CHOCH3CH2OHCH3CH2FCH3CH2CH315. In the molecules N2H4, N2H2, and N2, the nitrogen atoms are linked by single, double and triple bonds, respectively. When these molecules are arranged in increasing order of the lengths of their nitrogen to nitrogen bonds (shortest bond first) which order is correct?N2H4, N2, N2H2N2H4, N2H2, N2N2H2, N2, N2H4N2, N2H2, N2H416. What is the formula for an ionic compound formed between an element, X, from group 2 and an element, Y, from group 6?XYX2YXY2X2Y617. When C2H4, C2H2 and C2H6 are arranged in order of increasing C–C bond length, what is the correct order?C2H6, C2H2, C2H4C2H4, C2H2, C2H6 C2H2, C2H4, C2H6C2H4, C2H6, C2H218. Which species has a trigonal planar shape?CO3 2–SO3 2–NF3PCl319. Which compound contains both ionic and covalent bonds?MgCl2HClH2CONH4Cl20. Which compound has the least covalent character? SiO2Na2OMgCl2CsF21. What are responsible for the high electrical conductivity of metals?Delocalised positive ionsDelocalised valence electronsDelocalised atomsDelocalised negative ions22. Which molecule is polar?CO2PF3CH4BF323. What intermolecular forces are present in gaseous hydrogen?Hydrogen bondsCovalent bondsDipole-dipole attractions Van der Waals’ forces24. Which is a correct description of metallic bonding?Positively charged metal ions are attracted to negatively charged ions.Negatively charged metal ions are attracted to positively charged metal ions.Positively charged metal ions are attracted to delocalised electrons.Negatively charged metal ions are attracted to delocalised electrons.25. In which substance is hydrogen bonding present?CH4CH2F2CH3CHOCH3OH26. Which molecule has the smallest bond angle?CO2NH3CH4C2H427. Which substance is most similar in shape to NH3?GaI3BF3FeCl3 PBr3 28. Which fluoride is the most ionic?NaFCsFMgF2BaF2 29. What is the valence shell electron pair repulsion (VSEPR) theory used to predict?The energy levels in an atomThe shapes or geometry of molecules and ionsThe electronegativities of elementsThe type of bonding in compounds30. Which statement is true for most ionic compounds?They contain elements of similar electronegativity.They conduct electricity in the solid state.They are coloured.They have high melting and boiling points.31. When the following bond types are listed in decreasing order of strength (strongest first), what is the correct order? covalent > hydrogen > van der Waals’covalent > van der Waals’ > hydrogenhydrogen > covalent > van der Waals’van der Waals’ > hydrogen > covalent32. Which substance has the lowest electrical conductivity?Cu(s)Hg(l) H2(g)LiOH(aq) 33. What happens when sodium and oxygen combine together? Each sodium atom gains one electron.Each sodium atom loses one electron.Each oxygen atom gains one electron.Each oxygen atom loses one electron.34. Which statement is correct about two elements whose atoms form a covalent bond with each other?The elements are metals.The elements are non-metals.The elements have very low electronegativity values.The elements have very different electronegativity values.35. Why is the boiling point of PH3 lower than that of NH3?PH3 is non-polar whereas NH3 is polar.PH3 is not hydrogen bonded whereas NH3 is hydrogen bonded.Van der Waals’ forces are weaker in PH3 than in NH3.The molar mass of PH3 is greater than that of NH3.
