Question

please show explanation on all 4

Provide brief answers to the following questions. 1. The melting points of MgO, 2800°C; Cao, 1728°C; Sro, 1635°C; BaO, 1475°C What is the reason behind this trend? 2. Write a balanced reaction for the following a. Silicon tetrachloride with water b. Titanium(IV)chloride with water 3. Write the formulas for the Period 4 main group metal fluorides. Identify the mostly likely type of bonding to occur in each case. 4. When methylammonium chloride is dissolved in deuterium dioxide only half the atoms are replaced with deuterium atoms, why?

Answer 1

SOLN 1

MELTING POINT is the tempreature at which solids get converted to liquid.

For this reason, greater the strength of Metal oxide higher will be heat required to break the bond and greater will be its melting point .

In this case , melting point is directly proportional to ionic character. (Ionic character is proportional to bond strength)

This can be qualitatively predicted by Fajan's rule.

It says that greater is the radius of cation , greater will be the  ionic character

From the above explanation the melting point order is:

MgO > CaO > SrO > BaO

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