Some Basic Concepts of Chemistry

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Question
CBSEENCH11004886

Define the term significant figures.

Solution

Significant figures are meaningful digits which are known with certainty. 

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Question
CBSEENCH11004887

What is the number of significant figures in 0.0026?

Solution

Two

Question
CBSEENCH11004888

What is the number of significant figures in 9.984?

Solution

Four

Question
CBSEENCH11004889

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

Solution

6·02×1023.