Discuss the following: deltatHdegree becomes less negative along the series LiF.

Question

Discuss the following: deltatHdegree becomes less negative along the series LiF. NaF. KF. RbF. and CsF, but more negative along the series LiI, Nai, KI, Rbl. and Csl. Raising the temperature of a sample of a-Fe from 298 K to 1200 K (at one bar pressure) results in a change of coordination number of each Fe atom from 8 to 12. Although a non-metal, graphite is often used as an electrode material. The seminconducting properties of silicon are improved by adding minute amounts of boron The Cr and Ni content of stainless steels used to make knife blades is different from that used in the manufacturing of spoons.

Explanation / Answer

a) Fals:

higher lattice energies associated with higher charges on the ions so LiF, NaF..etc will have high value of enthalphy than LiI, NaI, etc..

b) False

c) True

Graphite is the most commonly used EDM electrode material because of its good machinability

d) True

e) True

The composition of Ni and Cr will change from alloy to alloy based on usage requirement

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