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  4. The significant figures in 1.0024, 1.240 and 0.0020 are respectively:

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Q. The significant figures in $1.0024,\, 1.240$ and $0.0020$ are respectively:

JIPMERJIPMER 2004Some Basic Concepts of Chemistry

Solution:

In $1.0024$, all figures are significant. In $1.240$,the significant figures are four (zero tells about precision). Zero before a number are not significant, hence $0.0020$ has only two significant numbers ( 2 and 0 after 2).