TS EAMCET · Chemistry · p Block Elements (Group 13 & 14)

Assertion (A): Graphite is used as a dry lubricant in machines which run at high temperatures Reason (R): The layers of graphite slip one over the other when pressure is applied The correct option among the following is

A (A) is true but (R) is false
B (A) is false but (R) is true
C (A) and (R) are true. (R) is the correct explanation of (A)
D (A) and (R) are true, but (R) is not correct explanation of (A)

Verified Solution

Answer & Solution

Correct Answer

(C) (A) and (R) are true. (R) is the correct explanation of (A)

Step-by-step Solution

Detailed explanation

Graphite is an allo rope of carbon that is soft and slippery due to which it is used as a lubricant. Thus, Assertion (A) is true. The reason for soft nature of graphite is the hexagonal layers of carbon atoms that slip over one another at high pressures. Thus, Reason (R) is true…

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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