The major product [C] of the following reaction sequence will be :

The major product [R] in the following sequence of reactions as :

The shortest wavelength of H atom in the Lyman series is $$\lambda $$₁. The longest wavelength in the Balmar series of He⁺ is :

A 100 mL solution was made by adding 1.43 g of Na₂CO₃.xH₂O. The normality of the solution is 0.1 N. The value of x is _____.

(The atomic mass of Na is 23 g/mol)