AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties

Identify the correct statements from the following
(i) The atomic radius of $\mathrm{Al}$ is lower than the atomic radius of $\mathrm{Ga}$.
(ii) Boron exists in many allotropic forms.
(iii) The melting point of $\mathrm{Ga}$ is lowest among the group 13 elements.

A i, ii, iii
B ii, iii
C i, ii
D i, iii

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Answer & Solution

Correct Answer

(B) ii, iii

Step-by-step Solution

Detailed explanation

Boron exists in many allotropic forms. (i) $\alpha$-rhombohedral (ii) $\beta$-rhombohedral (iii) $\beta$-tetragonal in many specific condition it will exists in $\alpha$ and $\beta$-tetragonal forms. The melting point of $\mathrm{Ga}$ is lowest in group 13. When we…

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.

Same subject

Match the following.

List - $I$ Reaction		List - $II$ Catalyst
$(A)$	$N_{2} (g) + 3 H_{2} (g) ⟶ 2 {NH}_{3} (g)$	$(I)$	$Ni$
$(B)$	$2 H_{2} (g) + O_{2} (g) ⟶ 2 H_{2} O (l)$	$(II)$	$Pt$
$(C)$	$CO (g) + 3 H_{2} (g) ⟶ {CH}_{4} (g) + H_{2} O (g)$	$(III)$	$ZnO - {Cr}_{2} O_{3}$
$(D)$	$CO (g) + 2 H_{2} (g) ⟶ {CH}_{3} OH (g)$	$(IV)$	$Fe$

The correct answer is:

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Identify the correct statements from the following
(i) The atomic radius of \(\mathrm{Al}\) is lower than the atomic radius of \(\mathrm{Ga}\).
(ii) Boron exists in many allotropic forms.
(iii) The melting point of \(\mathrm{Ga}\) is lowest among the group 13 elements.

Answer & Solution

Step-by-step Solution

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Identify the correct statements from the following(i) The atomic radius of \(\mathrm{Al}\) is lower than the atomic radius of \(\mathrm{Ga}\).(ii) Boron exists in many allotropic forms.(iii) The melting point of \(\mathrm{Ga}\) is lowest among the group 13 elements.

Step-by-step Solution

Identify the correct statements from the following
(i) The atomic radius of \(\mathrm{Al}\) is lower than the atomic radius of \(\mathrm{Ga}\).
(ii) Boron exists in many allotropic forms.
(iii) The melting point of \(\mathrm{Ga}\) is lowest among the group 13 elements.