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Chapter 10: Problem 93

On reaction with dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\), an inorganic. salt ( \(\Lambda\) ) gives a gas which gives a milky precipitate on passing through lime water. The salt is (a) \(\mathrm{NaNO}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{HCOONa}\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}\)

Short Answer

Expert verified
The salt is \( \mathrm{Na}_{2} \mathrm{CO}_{3} \).

Step by step solution

01

Analyze the Reaction

Identify the type of gas produced when each salt is reacted with dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \). A carbonate or bicarbonate salt like \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) or \( \mathrm{HCOONa} \) typically releases \( \mathrm{CO}_{2} \) gas upon reaction with acids.
02

Check the Lime Water Reaction

The gas that turns lime water (\( \mathrm{Ca(OH)_2} \)) milky is carbon dioxide (\( \mathrm{CO}_{2} \)), due to the formation of calcium carbonate (\( \mathrm{CaCO_3} \)).
03

Determine Consistency with Options

Check each option for which can produce \( \mathrm{CO}_{2} \): - (a) \( \mathrm{NaNO}_{3} \) does not produce \( \mathrm{CO}_{2} \) with \( \mathrm{H}_{2} \mathrm{SO}_{4} \).- (b) \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) produces \( \mathrm{CO}_{2} \).- (c) \( \mathrm{HCOONa} \) can produce \( \mathrm{CO}_{2} \), but typically produces carbon monoxide, requiring further analysis.- (d) \( \mathrm{Na}_{2} \mathrm{SO}_{3} \) does not produce \( \mathrm{CO}_{2} \).
04

Confirm Result

Given that \( \mathrm{CO}_{2} \) is the gas making lime water milky, and the options include \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) and \( \mathrm{HCOONa} \), but \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) is the more straightforward source for \( \mathrm{CO}_{2} \) with this reaction, we select it.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Acid-Base Reactions
Acid-base reactions are fundamental in inorganic chemistry. They occur when an acid reacts with a base, resulting in the neutralization of the acid and formation of a salt and water. In these reactions, the acid donates a proton (H\(^+\)) to the base. A classic example is the reaction between sulfuric acid, \ }

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Most popular questions from this chapter

On reaction with \(\mathrm{H}_{2} \mathrm{~S}\) gas, the solution of a salt in dilute HCl gives a black precipitate. The salt is/are (a) Nickel salt (b) Copper salt (c) Calcium salt (d) Lead salt

When a mixture containing phosphate is heated with conc, \(\mathrm{HNO}_{3}\) and ammonium molybdate solution, a cannery yellow precipitate is formed. The formula of the yellow precipitate is (a) \(\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} 12 \mathrm{MoO}_{4}\) (b) \(\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4} 12 \mathrm{MoO}_{3}\) (c) \(\left(\mathrm{N} 1 \mathrm{l}_{4}\right)_{3} \mathrm{PO}_{4}\left(\mathrm{NII}_{4}\right)_{2} \mathrm{MoO}_{4}\) (d) (NH I \()_{3} \mathrm{PO}_{1}\)

Sulpturic acid is not used for the preparation of original solution in the analysis of basic radicals berause: (a) It is a strong reducing agent. (b) It decomposes marty of the tanions. (c) If forms insoluble sulpharcs wirh some of the basic radicals. (d) Ir is a srtong oxitlizing agcnr.

The aqueous solution of mixture gives white precipitate with dil. HCl which disolves in excess of dil. I ICl. Ir confirms (a) \(7 \mathrm{nSO}_{4}+\mathrm{NaOII}\) (b) \(\mathrm{BaCl}_{2}+\mathrm{NaOII}\) (c) \(\mathrm{AgNO}_{3}, \mathrm{NaOH}\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{NaOH}\)

Which onc of rhe following srarcment is corrccr? a) Ferric ions give a decp grecn prccipitate on adding potassium ferrocyanide solution. b) From a mixed precipitate of \(A g(1\) and \(\Lambda g I,\), ammonia solution dissolves only \(\Lambda_{\mathrm{g}} \mathrm{Cl}\). c) Manganese salts give a violet borax bead resr in rhe reducing flame. (d) On boiling a solurion having \(\mathrm{K}^{\prime}, \mathrm{Ca}^{2}\) and \(\mathrm{HCO}_{3}^{-}\) ions we ger a precipitate of \(\mathrm{K}_{2} \mathrm{Ca}(\mathrm{CO})_{3}\)
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