This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the solutions to the chemistry quiz questions: 2. Which molecule has a central atom with no lone pairs? A) NH_3: Nitrogen has one lone pair. B) H_2O: Oxygen has two lone pairs. C) CH_4: Carbon has no lone pairs. D) SO_2: Sulfur has one lone pair. The correct option is C. C 23. Resonance in nitrate ion (NO_3^-) results in: The nitrate ion has one double bond and two single bonds that are delocalized through resonance, resulting in three equivalent bonds. The correct option is B. B 24. Molecular geometry of CH_4 is: Methane (CH_4) has a central carbon atom bonded to four hydrogen atoms with no lone pairs, leading to a tetrahedral geometry. The correct option is A. A 25. Molecular geometry of NH_3 is: Ammonia (NH_3) has a central nitrogen atom bonded to three hydrogen atoms and one lone pair, resulting in a trigonal pyramidal geometry. The correct option is B. B 26. Electron geometry around O in H_2O is: Water (H_2O) has a central oxygen atom with two bonding pairs and two lone pairs, giving it a tetrahedral electron geometry. The correct option is D. D 27. Molecular geometry of CO_2 is: Carbon dioxide (CO_2) has a central carbon atom double-bonded to two oxygen atoms with no lone pairs, resulting in a linear geometry. The correct option is A. A 28. Electron geometry around B in BF_3 is: Boron trifluoride (BF_3) has a central boron atom bonded to three fluorine atoms with no lone pairs, giving it a trigonal planar electron geometry. The correct option is A. A 29. Molecular geometry of PF_5 is: Phosphorus pentafluoride (PF_5) has a central phosphorus atom bonded to five fluorine atoms with no lone pairs, resulting in a trigonal bipyramidal geometry. The correct option is A. A 30. Which molecule is nonpolar? CO_2 is linear, and its polar C=O bonds cancel out due to symmetry, making the molecule nonpolar. The correct option is C. C 31. Which molecule is polar? SO_2 has a bent geometry with polar S-O bonds and a lone pair on sulfur, resulting in a net dipole moment, making it polar. The correct option is C. C 32. SO_2 geometry is: Sulfur dioxide (SO_2) has a central sulfur atom with two bonding pairs and one lone pair, resulting in a bent molecular geometry. The correct option is B. B 33. HCN polarity is: Hydrogen cyanide (HCN) has a linear structure with a highly polar C≡N bond and a slightly polar C-H bond. The dipoles do not cancel, making it polar. The correct option is B. B 34. CH_3OH polarity is: Methanol (CH_3OH) contains polar C-O and O-H bonds and has an asymmetric structure, resulting in a net dipole moment, making it polar. The correct option is B. B 35. Which molecule has delocalized electrons? Ozone (O_3) exhibits resonance, which means it has delocalized electrons. The correct option is B. B 36. Which molecule is trigonal pyramidal? Ammonia (NH_3) has a central nitrogen atom with three bonding pairs and one lone pair, giving it a trigonal pyramidal geometry. The correct option is B. B 37. Which molecule is linear? Carbon dioxide (CO_2) has a linear molecular geometry. The correct option is B. B 38. Which molecule is nonpolar due to symmetry? Carbon tetrachloride (CCl_4) has a tetrahedral geometry. Although the C-Cl bonds are polar, the symmetrical arrangement causes the bond dipoles to