Chemistry · Some Basic Concepts of Chemistry

Consider the following statements regarding significant figures and rules of rounding off: (A) In addition or subtraction, the result cannot have more digits to the right of the decimal point than any of the original numbers. (B) The number \( 4.01 \times 10^2 \) contains three significant figures. (C) If the rightmost digit to be removed is more than 5, the preceding number is decreased by one. (D) For \( 6.35 \), rounding off to two significant figures gives \( 6.4 \). How many of the above statements are correct?

1. Only one
2. Only two
3. Only three
4. All four