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  • 1. Mixed Topic - Quiz


    1. If the shortest wavelength of hydrogen atom in Lyman series is x, then longest wavelength in Balmer series of He+ is
    a) $\frac{9x}{5}$
    b) $\frac{36x}{5}$
    c) $\frac{x}{4}$
    d) $\frac{5x}{9}$

    2. The gas liberated on heating a mixture of two salts with NaOH , give a reddish brown presipitate with an alkaline solution of K2HgI4. The aqueous solution of the mixture on treatment with BaCl2 gives a white precipitate which is sparingly soluble in conc. HCl . On heating the mixture with K2Cr2O7 and conc. H2OSO4, red vapours are proced. The aqueous solution of mixture gives a deep blue colouration with potassium ferricyanide solution. Then, identify the radicals in the given mixture.
    a) $NH_{4}^{+}, Fe^{3+}, SO_{4}^{2-}, NO_{2}^{-}$
    b) $CO_{3}^{2-}, Fe^{2+}, SO_{4}^{-}, Cl^{-}$
    c) $NH_{4}^{+}, Fe^{2+} , SO_{4}^{2-}, Cl^{-}$
    d) $NH_{4}^{+}, Ca^{2+}, SO^{2-}_{4}, Cl^{-}$