SATHEE: Some Basic Concepts Of Chemistry Question 253

Some Basic Concepts Of Chemistry Question 253

Question: 100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ?x? is (molecular wt. of $C u S O_{4} .5 H_{2} O$ is 250)

Options:

A) 5.0 g

B) 1.25 g

C) 2.5 g

D) 4 g

Show Answer

Answer:

Correct Answer: C

Solution:

$\overset{+ 2}{C u S O_{4}}, + 2 K I \to K_{2} S O_{4} + \overset{+ 2,}{C u I_{2}},$ ; $2 \overset{+ 2,}{C u I_{2}}, \to \overset{+ 1,}{C u I_{2}}, + I_{2}$

$I_{2} + 2 N a_{2} S_{2} O_{3} \to 2 N a I + N a_{2} S_{4} O_{6}$

Eq. wt. Of $C u S O_{4} .5 H_{2} O = M o l . wt . = 250$

100 ml of 0.1 N hypo º 100 ml of 0.1 N $C u S O_{4} .5 H_{2} O$

$= \frac{250 \times 0.1 \times 100}{100} = 2.5, g m$

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Some Basic Concepts Of Chemistry Question 253

Question: 100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ?x? is (molecular wt. of CuSO4.5H2O is 250)

Options:

Answer:

Solution:

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Question: 100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ?x? is (molecular wt. of $C u S O_{4} .5 H_{2} O$ is 250)