SolidsLattice Energy51Choose the best answerIf lattice energy is defined as lattice dissociation enthalpy, a positive lattice-energy value represents:AEnergy released when the lattice formsBEnergy required to separate the ionic crystal into gaseous ionsCEnergy needed to melt the solid onlyDZero energy change Like 0 Discuss 0Share
SolidsPolymorphism52Choose the best answerCalcite and aragonite are different crystalline forms of CaCO₃. This is an example of:APolymorphismBIsomorphismCAnisotropyDTransition only Like 0 Discuss 0Share
MDCAT Chemistry Past Papers 2024Sindh MDCAT Chemistry Past Paper 2024#Molecular Solids#Solids53Choose the best answerDry ice is the example of:AMolecular solidBMetallic solidCCovalent solidDIonic solid Like 0 Discuss 0Share
SolidsProperties of Graphite54Choose the best answerGraphite feels soft and greasy mainly because:AIts covalent bonds are weakBIts layers can slide over one anotherCIt contains mobile ionsDIt has a low melting point Like 0 Discuss 0Share
SolidsDensity of Ice55Choose the best answerIce floats on liquid water because:AIce is heavier than waterBIce has lower density due to its open structureCIce has greater electrical conductivityDIce contains more hydrogen atoms Like 2 Discuss 0Share2