Question

Show that 12n cannot end with the digit 0 or 1. Which among the following statement(s) is (are) true?
Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i)The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chloride. 1

(i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (iv) only

Answer 1

Answer:

Here, Number 12

n

where nϵN

Now 12

n

=(2

2

×3)

n

Now, for 12

n

to end with 0, it should have 2 as well as 5 in its prime factors. Also to end with 5, of require at least a single multiple of 5 in its prime factors, so 12

n

cannot end with the digit 0 or 5.