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Standard XII

Chemistry

Preparations and Uses of Sodium Bicarbonate and Common Salt

Which of the ...

Question

Which of the following is known as fusion mixture?

mixture of

N a_{2} C O_{3} + N a H C O_{3}

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N a_{2} C O_{3} + 10 H_{2} O

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mixture of

K_{2} C O_{3} + N a_{2} C O_{3}

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N a H C O_{3}

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Solution

The correct option is B mixture of $K_{2} C O_{3} + N a_{2} C O_{3}$
A fusion mixture consists of a sodium salt and a potassium salt. Generally, mixture of potassium carbonate and sodium carbonate is used. It is called a fusion mixture because it is fused with a sample of organic compound to test for various groups.
Hence option C having both sodium carbonate and potassium carbonate is the correct answer.

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Similar questions

Q. A mixture of

N a H C O_{3}

and

N a_{2} C O_{3}

weighed .0235 g. The dissolved mixture was reacted with excess of

8 a (O H)_{2}

to form

2.1028 g B a C O_{3}

, by the following reactions:

N a_{2} C O_{3} + B a (O H)_{2} \to B a C O_{3} + 2 N a O H

N a H C O_{3} + B a (O H)_{2} \to B a C O_{3} + N a O H + H_{2} O

What was the percentage of

N a H C O_{3}

in the original mixture ?

4g of a mixture of Na₂CO₃and NaHCO₃ on heating liberates 448 mL of CO₂ at STP. The percentage of Na₂CO₃ in the mixture is?

Q. A

2.0

g sample containing

{N a}_{2} C O_{3}

and

N a H C O_{3}

loses

0.248

g when heated to

300

^{o} C

, the temperature at which

N a H C O_{3}

decomposes to

{N a}_{2} C O_{3}, C O_{2}

and

H_{2} O

. The

%

{N a}_{2} C O_{3}

in the mixture is (as the nearest integer):

Q. A 2.00 g. of sample containing

N a_{2} C O_{3}

and

N a H C O_{3}

loses 0.248 g when heated to

300^{o} C

, the temperature at which

N a H C O_{3}

decomposes .Find % composition of

N a_{2} C O_{3}

in the mixture ?

Q. A 2 g sample containing

N a_{2} C O_{3}

and

N a H C O_{3}

loses 0.62 g when heated to

300^{o} C,

the temperature at which

N a H C O_{3}

decomposes to

N a_{2} C O_{3}, C O_{2}

and

H_{2} O .

What is the percentage of

N a_{2} C O_{3}

in the given mixture.

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