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Some Basic Concepts Of Chemistry

Question
CBSEENCH11005010
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Define the law of reciprocal proportion. Explain with suitable examples.

Solution

The law of reciprocal proportion (Richtev 1792) states that if two elements A and B combine separately with another element C, then the ratio of respective weights of A and B which combine with a fixed weight of C is the same or simple multiple of the weights in which A and B combine with each other. For example, sodium and chlorine combine with hydrogen to form compounds NaH and HCl respectively.

In NaH:
23 g sodium combines with 1 g hydrogen.
In HCl:
35·5 g chloride combines with 1 g hydrogen.

The ratio of masses of sodium and chlorine which combine with a fixed mass of hydrogen (1 g) is 23 : 35·5
Now sodium and chlorine also combine to form NaCl.
In NaCl:
23g sodium combines with 35·5 chlorine in the ratio 23 : 35·5
This is the same ratio which combines with one part of hydrogen in NaH and HCl.

Some More Questions From Some Basic Concepts of Chemistry Chapter

Define the term significant figures.

What is the number of significant figures in 0.0026?

What is the number of significant figures in 9.984?

Express the Avogadro's number (6·023×1023) upto three significant figures.

What is the result of (5.472 - 1.12) to the appropriate number of signficant figures?

Express 0.0468 in scientific notation.

What does SI units stand for?

What is the relation between temperature in Kelvin (K) and temperature on centigrade scale?

The popular unit of pressure is atmosphere, how is it related to pascal?

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