Class 11 Chemistry

Chapter 1 – Basic Concepts of Chemistry

Assignment

 

Q.1.       State the number of significant figures in each of the following numbers:

(i) 207.35

(ii) 0.00368

(iii) 653

(iv) 3.653 × 10⁴

(v) 0.378

Q.2.       Express the following in the scientific notation:

(i) 0.0048

(ii) 234,000

(iii) 8008

(iv) 500.0

(v) 6.0012

Q.3.       Calculate the number of significant figures in the following values:

(i) Planck's constant = 6.626 × 10^–34 Js

(ii) Avogadro number= 6.023 × 10²³

(iii) Velocity of light= 3.0 × 10⁸ ms^–1

(iv) Electronic charge = 1.602 × 10^–19 C

Q.4.       Calculate the number of significant figures in the following

(i) 0.0025

(ii) 208

(iii) 5005

(iv) 126,000

(v) 500.0

(vi) 2.0034

Q.5.       Express the following numbers up to four significant figures:

(i) 5.607892

(ii) 32.392800

(iii) 0.007837        

(iv) 1. 78986 × 10³

(v) 60000

 

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