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Comprehension Iodine is an impor†an t subs†an ce needed by the body of a human being. We consume it in the form of salt, which has very very samll % con†an t of I_2. Iodine has various industrial application also. The following process has been used to obtain iodine from oil field brines in California: NaI+AgNO_3=AgI+NaNO_3 AgI+Fe=Fe+Ag FeI_2+Cl_2=FeCl_3+I_2 Q. If 381 kg of iodine is produced per hour,40kg then mass of AgNO_3 required per hour will be: (A) 170kg (B) 340kg (C) 255kg (D) 510kg Q. If above reaction is carried out by taking 150kg of NaI and 85kg of AgNO_3,then number of moles of iodine formed is: (A) 0.5 (B) 500 (C) 250 (D) 0.25

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2 N a I O_{3} + 5 N a H S O_{3} \to 2 N a H S O_{4} + 2 N a_{2} S O_{4} + H_{2} O + I_{2}

if the given reaction is used for the preparation of iodine gas then how much

N a H S O_{3}

is required to produce

381

I_{2}

Q. An iodised salt contain 0.5% of

N a I

. A person consumes

3 g

of salt everyday. The number of iodide ions going into his body everyday is:

[Atomic wt. of Iodine = 127]

Q. Tincture of iodine has antiseptic properties. This solution is made by dissolving :
(a) iodine in potassium iodide
(b) iodine in acetone
(c) iodine in water
(d) iodine in alcohol

Q. Question 4
Tincture of iodine has antiseptic properties. This solution is made by dissolving

(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol

Q. Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

(a) What could X be ?
(b) What could Y be ?
(c) Name the process Z.
(d) Which process would you use to recover both the components X and Y from tincture of iodine ?
(e) Which process can be used to recover only components Y from tincture of iodine ?

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