The most common polar and acidic support used in adsorption chromatography is silica. The surface silanol groups present on silica effectively adsorb polar compounds, making it particularly well-suited for basic substances. Alumina, being polar and basic, is also widely used as an adsorbent in adsorption chromatography. Together, these make the pair of adsorbents utilized frequently for such purposes.
Let $ P_n = \alpha^n + \beta^n $, $ n \in \mathbb{N} $. If $ P_{10} = 123,\ P_9 = 76,\ P_8 = 47 $ and $ P_1 = 1 $, then the quadratic equation having roots $ \alpha $ and $ \frac{1}{\beta} $ is:
In the given circuit the sliding contact is pulled outwards such that the electric current in the circuit changes at the rate of 8 A/s. At an instant when R is 12 Ω, the value of the current in the circuit will be A.