9a. Select from the list given (A to E) one substance in each case which matches the description given in parts (i) to (v). (Note: Each substance is used only once in the answer.)
(B) Iron (III) chloride
(i) A compound which is deliquescent.
(ii) A compound which is insoluble in cold water, but soluble in hot water.
(iii) The compound responsible for the brown ring during the brown ring test of nitrate ion.
(iv) A compound whose aqueous solution is neutral in nature.
(v) The compound which is responsible for the green coloration when sulphur dioxide is passed through acidified potassium
dichromate solution.

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Solution

Step 1: Explanation for correct option:
The correct option is (i) A compound which is deliquescent. When exposed to air, a deliquescent salt takes moisture from the air and transforms it into a solution. Salts are the most deliquescent compounds.
The given ${FeCl}_{3}$ salt has a very low melting point. Thus, it readily absorbs moisture from aid and forms hydrated Iron chloride ${FeCl}_{3} . 6 H_{2} O$ .
Step 2: Explanation for incorrect option:
Since it is soluble in water and is not a neutral salt, options (ii) and (iv) are incorrect.
Since it is yellow, options (iii) and (v) are also incorrect.
Final Answer: The correct option is (i) A compound which is deliquescent.

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(i) A non-metal which is a good conductor of electricity

(ii)A covalent compound which behaves like an ionic compound in aqueous solution

(iii) A compound which is insoluble in cold water but soluble in excess of ammonia solution.

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(v) A non-metal which reacts with concentrated nitric acid to form its own acid as one of the product.

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(A) Sulphur (B) Silver chloride (C)Hydrogen chloride (D)Copper (II) sulphate (E) Graphite

(i) A non metal which is good conductor of electricity.

(ii) A covalent compound which behaves like an ionic compound in aqueous solution.

(iii) A compound that is insoluble in cold water but solvable in excess ammonia solution

(iv) A pink metal deposited at cathode during the electrolysis of the solution of this salt.

(v) A non-metal which reacts with concentrated nitric acid to form its own acid as one of the product.

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