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A red liquid (A) when treated with sodiu...

A red liquid (A) when treated with sodium carbonate gives a mixture of two sails (B) and (C) in the solution In which (C) contains oxygen. The mixture then on acidification with sulphuric acid and distillation produces the red liquid (A) again.
Which of the following statement is false for salt (B)?

A

Its solution in water gives pale yellow precipitate with silver nitrate solution.

B

Its solution in water gives white precipitate with lead nitrate solution

C

Its acidified solution (with conc. `H_(2)SO_(4)`) liberates a coloured gas which produces orange red spots on starch paper

D

None

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem step by step, we will analyze the information provided and deduce the correct answer. ### Step 1: Identify the Red Liquid (A) The red liquid (A) mentioned in the question is bromine water (Br2 in water). This is a common reagent that appears red-brown in color. **Hint:** Think about common red liquids in chemistry and their properties. ### Step 2: Reaction with Sodium Carbonate When bromine water (A) reacts with sodium carbonate (Na2CO3), it produces two salts: sodium bromide (NaBr) and sodium bromate (NaBrO3). The reaction also releases carbon dioxide (CO2) gas. **Hint:** Consider the products formed when halogens react with carbonates. ### Step 3: Identify the Salts (B) and (C) In this reaction: - Salt (B) is sodium bromide (NaBr). - Salt (C) is sodium bromate (NaBrO3), which contains oxygen. **Hint:** Look for the compounds that are formed from the reaction of bromine with sodium carbonate. ### Step 4: Acidification and Distillation When the mixture of salts (B and C) is treated with dilute sulfuric acid (H2SO4), it leads to the liberation of bromine gas (Br2) again, which is the red liquid (A). The balanced reaction shows that sodium sulfate (Na2SO4) is also formed. **Hint:** Understand the process of acidification and how it can regenerate the original compound. ### Step 5: Analyze Statements About Salt (B) Now, we need to evaluate the statements given about salt (B), which is sodium bromide (NaBr): 1. **Statement 1:** Its solution in water gives a pale yellow precipitate with silver nitrate (AgNO3). - This is true because NaBr reacts with AgNO3 to form AgBr, which is a pale yellow precipitate. 2. **Statement 2:** Its solution in water gives a white precipitate with lead nitrate (Pb(NO3)2). - This is also true as NaBr reacts with Pb(NO3)2 to form PbBr2, which is a white precipitate. 3. **Statement 3:** Its acidified solution with concentrated H2SO4 liberates a colored gas that produces an orange-red spot on starch paper. - This is true because the reaction produces bromine gas, which is brownish-orange and can produce a color change on starch paper. 4. **Statement 4:** None of the statements are false. - Since all previous statements are true, this statement is also true. **Hint:** Carefully evaluate each statement against known chemical reactions and properties. ### Conclusion Since all statements regarding salt (B) are true, the correct answer to the question is that none of the statements are false. **Final Answer:** None of the statements are false about salt (B).
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