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Standard XII

Chemistry

Werner's Coordination Theory

A student add...

Question

A student added $2 m L$ of $0.1 M C a C l_{2}$ to $2 m L$ of $0.1 M N a_{2} C O_{3}$ in a test tube. He observed a white precipitate form.What was the identity of the precipitate?

C a C l_{2}

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N a_{2} C O_{3}

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N a C l

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C a C O_{3}

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Solution

The correct option is D $C a C O_{3}$
Here $C a C l_{2}$ react with $N a_{2} C O_{3}$ to give white ppt of $C a C O_{3}$ and $N a C l$
$C a C l_{2} + N a_{2} C O_{3} \to C a C o_{3} + 2 N a C l$

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A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:

Q. A sample of a mixture of

C a C l_{2}

and

N a_{2} C O_{3}

weighing

4.22

g was treated to precipitate all the

C a

C a C O_{3}

. This

C a C O_{3}

is heated and quantitatively converted into

0.959

g of

C a O

. Calculate the percentage of

C a C l_{2}

in the mixture.

(Atomic mass of

C a = 40, O = 16, C = 12

and

C l = 35.5 g / m o l e)

21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

C a C l_{2}

, the weight of precipitate of

C a C O_{3}

10.0 g

. Which of the following statements is/are correct ?

Q. A sample of mixture of

C a C l_{2}

and

N a C l

weighing

5.55

g was treated to precipitate all the

C a

C a C O_{3}

which was then heated and quantitatively converted to

1.68

g of

C a O

. The mass percentage of

C a C l_{2}

in the mixture is;

21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

C a C l_{2}

, the weight of precipitate of

C a C O_{3}

10.0 g

. Which of the following statements is/are correct ?

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A student added 2 mL of 0.1 M CaCl2 to 2 mL of 0.1 M Na2CO3 in a test tube. He observed a white precipitate form.What was the identity of the precipitate?

The correct option is D CaCO3Here CaCl2 react with Na2CO3 to give white ppt of CaCO3 and NaClCaCl2+Na2CO3→CaCo3+2NaCl

A student added $2 m L$ of $0.1 M C a C l_{2}$ to $2 m L$ of $0.1 M N a_{2} C O_{3}$ in a test tube. He observed a white precipitate form.What was the identity of the precipitate?

The correct option is D $C a C O_{3}$
Here $C a C l_{2}$ react with $N a_{2} C O_{3}$ to give white ppt of $C a C O_{3}$ and $N a C l$
$C a C l_{2} + N a_{2} C O_{3} \to C a C o_{3} + 2 N a C l$