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Which of the following statements is not correct?

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Important Questions on Solid State

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The melting point of RbBr is 682°C, while that of NaF is 988°C. The principal reason behind melting point of NaF being much higher than that of RbBr is that
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Which of the following crystals have the same general formula?
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Which of the following expression is correct for packing fraction of NaCl, if ions along the face are diagonally removed?
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The radius of Na+ is 95 pm and that of Cl- ion is 181 pm. Predict the coordination number of Na+.
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If the density of an ionic compound (molar mass 58.5 u) is 2.165 kgm-3 and the edge length of the unit cell is 562 pm, then the closest distance between A+ and B- and the rank of unit cell respectively are:
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IMPORTANT
The γ -form of iron has FCC structure (edge length, 386 pm) and β-form has BCC structure (edge length, 290 pm). The ratio of density in γ -form to that in β-form is:
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IMPORTANT
A non-stoichiometric compound, Cu1.8S is formed due to incorporation of Cu2+ ions in the lattice of cuprous sulphide. What is the percentage of Cu2+ ion in the total copper content in the compound?