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Octet Rule

Law of recipr...

Question

Law of reciprocal proportion can be verified by which of the following compounds?

A

C O_{2}, C H_{4}, H_{2} O

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B

N_{2} O, N_{2} O_{3}, N_{2} O_{5}

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C

N a C l, N a_{2} C O_{3}, N a O H

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D

H_{2} O, H C l, N a C l

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Solution

The correct option is A $C O_{2}, C H_{4}, H_{2} O$
Law of reciprocal proportion can be verified by the compounds $C O_{2}, C H_{4}, H_{2} O$ .
According to the law of reciprocal proportions "If two different elements combine separately with the same weight of a third element, the ratio of the masses in which they do so are either the same or a simple multiple of the mass ratio in which they combine."

Thus, 32 g of oxygen and 4 g of H combine separately with 12 g of C. The ratio of the masses is $32 : 4$ or $8 : 1$ .
Oxygen and H combine in the ratio $8 : 1$ by mass to form water.
Thus, the ratio is a simple multiple.

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Na2CO3+Hcl,_______≥NaCL+NaHCO3. Na2CO3+HcL________≥NaCL+H2o+CO2 why is it written like that ,is this equation both write?

Q. In the above reaction if

A

N H_{4} C l

D

C O_{2}

B

C

respectively are :

+ N a O H \to N a C l + N H_{3} + H_{2} O

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

+ N a C l \to (C) + N H_{4} C l

\to N a_{2} C O_{3} + H_{2} O + (D)

Q. A sample contains a mixture of

N a H C O_{3}

N a_{2} C O_{3}

H C l

15.0

g of the sample yielding

11.0

N a C l

. What percent of the sample is

N a_{2} C O_{3}

?
Reactions are:

N a_{2} C O_{3} + 2 H C l \to 2 N a C l + C O_{2} + H_{2} O

N a H C O_{3} + H C l \to N a C l + C O_{2} + H_{2} O

Molecular weight of

N a C l

N a H C O_{3}

N a_{2} C O_{3}

58.5

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106

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Q. Which choice or choices demonstrate amphoterism?
i.

H C l + H_{2} O \to H_{3} O^{+} + C l^{-}

H_{2} O + N_{3} \to O H^{-} + N H_{4}^{-}

H S^{-} + H C l \to C l^{-} + H_{2} S

H S^{-} + N H_{3} \to N H_{4}^{+} + S^{2 -}

H C l + N a O H \to N a C l + H_{2} O

N a C l + H_{2} O \to H C l + N a O H

Consider the following laws of chemical combination with examples.
I: Law of multiple proportions: N₂O,NO,NO₂
II: Law of reciprocal proportions: H₂O,SO₂,H₂S

Which is correct with examples?

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