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

In which allotropes of carbon does each carbon atom form four bonds with other carbon atoms?

A Graphite
B Graphite and $\mathrm{C}_{60}$
C Diamond
D Diamond and $\mathrm{C}_{60}$

Verified Solution

Answer & Solution

Correct Answer

(C) Diamond

Step-by-step Solution

Detailed explanation

Carbon has an electronic arrangement of 2, 4 . In diamond each carbon shares electrons with four other carbon atom. Forming four single bonds.

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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Match the items given in List-A with those of the items of List-B

	List-A		List-B
(A)	The vertex of the parabola $y^{2} + 4 x - 2 y + 3 = 0$ is	(I)	$(\frac{5}{4}, 1)$
(B)	The vertex of the parabola $x^{2} + 8 x + 12 y + 4 = 0$ is	(II)	$(1, \frac{5}{4})$
(C)	The focus of the parabola $y^{2} - x - 2 y + 2 = 0$ is	(III)	$(\frac{- 1}{2}, 1)$
(D)	The focus of the parabola $x^{2} - 2 x - 8 y - 23 = 0$ is	(IV)	$(1, - 1)$
		(V)	$(- 4, 1)$

The correct match is

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The member of significant figures in 2.0400 is

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