MHT CET · Chemistry · s Block Elements

Which among the following sets of compounds is used as raw material for the preparation of sodium carbonate by Solvay process?

A $N a O H, H C l, C O_{2}$
B $N H_{4} C l, H_{2} O, N a C l$
C $N a C l, N H_{3}, C a {(O H)}_{2}$
D $N a C l, C a C O_{3}, H_{2} S O_{4}$

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Answer & Solution

Correct Answer

(C) $N a C l, N H_{3}, C a {(O H)}_{2}$

Step-by-step Solution

Detailed explanation

Solvay’s process of manufacturing of sodium carbonate:
$2\text{NaCl} + \text{CaCO} _3+ \text{CO} _2+ \text{H} _2 \text{O}\rightarrow 2 \text{NaHCO} _3$ $+ \text{ CaCl} _2$
$2 \text{NaHCO} _3 \xrightarrow{\Delta} \text{Na} _2 \text{CO} _3+ \text{H} _2 \text{O} + \text{CO} _2$

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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Match the embryonal cell in column I with -their origin given in column II and choose the correct options given below.

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a.	Suspensor initial	i.	Large basal cell of the 2-celled pro-embryo
b.	Embryonal initial	ii.	First cell of the suspensor towards micropylar end.
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d.	Hypophysis	iv.	Small terminal cell 2-celled of pro-embryo

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