Which of the following represents the equation for Delta H of crystal lattice en

Question

Which of the following represents the equation for Delta H of crystal lattice energy? Br_2 (l) rightarrow Br_2 (g) Br_2 (g) rightarrow 2 Br(g) Br(g) + e- rightarrow Br^- (g) K^+ (g) + Br^- (g) rightarrow KBr(s) K(s) + 1/2 Br_2 (l) rightarrow KBr(s) Which of the following substances is most likely to exist as a solid at room temperature NH_3 KNO_2 NO_2 N_2 O_3 N_2 H_4 The forces of attraction between molecules of CCl_4 (tetrahedral shape) are dipole-dipole interaction London forces hydrogen bond ionic bond Which of the following isoelectronic particles has the smallest radius? F^- Na^+ Al^3+ Ne Mg^2+ 350.0 ml of 2.50 M HCl are added to 400.0 ml of 5.00 M HCl. Assuming that the volumes are additive, the final concentration is 3.65 M 3.83 M 4.17M 4.33M 4.50M It was found that it took 64 seconds for an unknown gas to effuse, whereas N_2 (g) required 48 seconds. What is the molar mass of the unknown gas? 16g/mole 24g/mole 30g/mole 40g/mole 50 g/mole A covalent network crystal has which of the following particles at its lattice points? cations anions atoms ionic compounds electrons The normal boiling point of a liquid is: The only temperature at which there can be equilibrium between the liquid and the gas states. The temperature above which the substance cannot exist as a liquid regardless of the pressure. The temperature at which gas molecules have more kinetic energy than molecules in the liquid. The temperature at which the vapor pressure equals barometric/atmospheric pressure at 760 mm Hg (or 1 atm) none of these

Explanation / Answer

Ans 8 (d)
Crystal lattice energy is defined as the heat of formation for ions of opposite charge in the gas phase to combine into an ionic solid.

For example :-
   AB(s) = A+(g) + B-(g)

Ans 9(b)
KNO2 is ionic but other four are covalent and in general ionic compounds have higher melting point
melting point of KNO2 is 440oC

Ans 10(a) In dipole-dipole interaction the partially negative portion of one of the polar molecules is attracted to the partially positive portion of the second polar molecule.

here dipole-dipole interaction is between C4+ and Cl-

Ans11(c) as all species are isoelectronic(having same no. of electrons) but for Al3+ charge
as we know that no. of protons doesen't change, now the force between outer electrons and nucleus is more in case of Al which in turns suck the electrons more towards nucleus that other species hence smallest radius

please ask rest of the part seperately thanks

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