TS EAMCET · Chemistry · Solid State

The angle between (100) and (110) planes of FCC lattice is

A \(90^{\circ}\)
B \(0^{\circ}\)
C \(45^{\circ}\)
D \(120^{\circ}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(45^{\circ}\)

Step-by-step Solution

Detailed explanation

Angle between (100) and (110) planes of fcc lattice is \(\cos \phi=\frac{h_1 h_2+k_1 k_2+l_1 l_2}{\sqrt{h_1^2+k_1^2+l_1^2 \sqrt{h_2^2+k_2^2+l_2^2}}}\) \(\cos \phi=\frac{(1 \times 1)+(0 \times 1)+(0 \times 0)}{\sqrt{(1)^2+(0)^2+(0)^2} \sqrt{(1)^2+(1)^2+(0)^2}}\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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