The passage represents a qualitative analysis flow diagram: (I) [Yellow ppt.] (A) [Gives blue colour to the flame] (B) [Brown Gas] (C) [Blue colour liquid] (D) (A) (F) [Black ppt.] (G) [Vapour] + (H)

Question

The passage represents a qualitative analysis flow diagram:
(I) [Yellow ppt.] $\xleftarrow{	ext{K}_2	ext{CrO}_4}$ (A) [Gives blue colour 
to the flame] $\xrightarrow{\Delta}$ (B) [Brown Gas] $\xrightarrow{	ext{Gas 
(H), Very low temp.}}$ (C) [Blue colour liquid] 
$\xrightarrow{	ext{H}_2	ext{O}}$ (D)
(A) $\xrightarrow{	ext{H}_2	ext{S}}$ (F) [Black ppt.] $\xrightarrow{	ext{dil.
HNO}_3}$ (G) [Vapour] + (H) [Gas]
(H) $\xrightarrow{	ext{FeSO}_4 + 	ext{H}_2	ext{SO}_4}$ (E) [Complex compound]

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Identify that aluminum carbide (Al4C3) contains Al3+ and C4- ions. Step 2: On hydrolysis, the C4- ion reacts with protons from water to produce methane (CH4) gas. Step 3: Carbides that yield methane upon hydrolysis are classified as methanides. Thus, Al4C3 is an ionic methanide, corresponding to option (b).

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