The number of covalent bonds in a molecule of ethane (C₂H₆) is: MCQ with Answer and Explanation

Explanation:
Single superphosphate (SSP) is a phosphorus fertilizer, a mixture of monocalcium phosphate and gypsum, produced by treating rock phosphate with sulfuric acid: Ca₃(PO₄)₂ + 2H₂SO₄ → Ca(H₂PO₄)₂ + 2CaSO₄. Urea and ammonium nitrate are nitrogenous fertilizers. Potassium chloride is a potash fertilizer. Phosphorus promotes root development and flowering.

Explanation:
Ideal gas equation: PV = nRT is obtained by combining Boyle's law (PV = constant at T,n), Charles' law (V ∝ T at P,n), and Avogadro's law (V ∝ n at P,T). Graham's law deals with diffusion, Dalton's with partial pressures. The constant R is the universal gas constant. For 1 mole, PV = RT. Real gases deviate at high pressure and low temperature.

Explanation:
pH = -log[H⁺] = -log(10⁻⁹) = 9. The solution is basic (pOH = 5). pH>7 indicates basic nature. Pure water has [H⁺] = 10⁻⁷.