Hydrogen contains one valence electron in its valence shell and thus, its valency is one. Therefore, hydrogen resembles alkali metals (group 1 elements) as they also contain one electron in...
Correct option is (D) none
Let Ramu's present age be x years.
\(\therefore\) Ramu's age before 4 years = (x - 4) years
Ramu's age after 12 years = (x + 12) years
\(\therefore\) x+12 = 3(x-4)
\(\Rightarrow\) x+12...
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