**1.**

**There are certain rules for determining the number of significant figures. These are stated below:**

a) All non-zero digits are
significant. For example in 285 cm, there are three significant figures and in
0.25 mL, there are two significant figures.

b) Zeros preceding to first non-zero
digit are not significant. Such zero indicates the position of decimal point.
Thus, 0.03 has one significant figure and 0.0052 has two significant figures.

c) Zeros between two non-zero digits
are significant. Thus, 2.005 has four significant figures.

d) Counting numbers of objects, for example, 2 balls or 20 eggs, have infinite significant figures as these are exact numbers and can be represented by writing infinite number of zeros after placing a decimal

i.e.,2 = 2.000000 or 20 = 20.000000

e) In numbers written in scientific
notation, all digits are significant e.g., 4.01×10

^{2}has three significant figures, and 8.256 × 10^{–3}has four significant figures.**Click here to view complete Chemistry Free Study Materials and Notes for NEET Preparation**

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