Question

Question 1.27 Convert the following into basic units:

(i) 28.7 pm

(ii) 15.15 pm

(iii) 25365 mg

Class XI Some Basic Concepts of Chemistry Page 24

Answer 1

concept : The basic unit for Length is metre,
for time is second and for mass is kilogram.

(i) 28.7 pm
we know,
1 pm = 10⁻¹² m
so, 28.7 pm = 28.7 × 10⁻¹² m = 2.87 × 10⁻¹¹ m

(ii) 15.15 μs
we know,
1 μs = 10⁻⁶ s
so, 15.15 μs = 15.15 × 10⁻⁶ m = 1.515 × 10⁻⁵ m

(iii) 25365 mg
we know,
1 mg = 10⁻⁶ kg
so, 25365 mg = 25365 × 10⁻⁶ kg
= 2.5365 × 10⁻² g

Answer 2

Answer:

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