Choose the answer which presents the chemical formulas for two substances in ord

Question

Choose the answer which presents the chemical formulas for two substances in order of decreasing melting point (highest melting point first) and gives a solid reason for this order. a) SiO_2 > CO_2 because SIO_2 is a covalent-network solid, and CO_2 is molecular. b) CO > C(diamond) because covalent bonding is stronger than dispersion forces. c)C_6Cl_6 > C_6H_6 due to ionic bonding in C_6Cl_6 not present in C_6H_5. d) Mg5 > BeO doc to larger ions in MgS giving stronger ionic bonding. e) NaCl > Rbl due ionic bonding in NaCI not present in Rbl. Choose the answer which presents the chemical formulas HOCI, NaCI, and CI_2 in order of increasing solubility of the substances with these formulas in water (lowest solubility listed first). a) HOCI

Explanation / Answer

7)

Option a is correct .

The melting point of SiO2 is higher than that of CO2.

This is because  SiO2 exist as a covalent network solid ,it exists in the polymeric form while carbon dioxide exists in the molecular form as discrete molecules.

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