30. For the reaction: 2x Y 3z 2XZ YZ identify the limiting reactant when 3 moles

Question

30. For the reaction: 2x Y 3z 2XZ YZ identify the limiting reactant when 3 moles of X, 2 moles of Y and 5 moles of Z are allowed to react. (B) Y (c) z (D) all three react completely 31. Which principle correctly explains the relative sizes of these species? (A) The species are isoelectronic and thus must have the (B) Negative ions are smaller than neutral atoms, which (C) The heavier the species, the larger its size, because same size. in turn are smaller than positive ions. heavier species contain a larger number of electrons and thus require more space. (D) These species are isoelectronic, thus their size decreases as the number of protons increases due to 32· The substances CO2 and BaC, form different numbers of species when in solution. Which best explains this phenomenon? (A) CO, is polar and BaCl, is non-polar. (B) CO2 is non-polar and BaCl, is polar. (C) CO, is covalent and BaCl, is ionic (D) CO, is ionic and BaCl, is covalent. 33. According to valence bond theory, methane (CH). ammonia (NH), and water (H20) all involve the same type of orbitals in bonding. Which best describes why these molecules have different bond angles? (A) The central atom has a different number of valence electrons. (B) These molecules have different numbers of lone electron pairs (C) These molecules have different electronegativities for the central atom. (D) These molecules can form a different number of hydrogen bonds.

Explanation / Answer

30 A as moles of y and z remains unreacted

31 D as proton attract electron towards nucleus

32 C

33 D

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