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0.25 g of an organic compound “A” containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl₂ tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is ____ %. (Nearest integer) (Given: molar mass in g mol⁻¹ H : 1, C : 12, O : 16)

0.25 g of an organic compound A containing carbon hydrogen and oxygen was analysed using the combustion method Q. 0.25

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A chromium complex with a formula CrCl₃·6H₂O has a spin only magnetic moment value of 3.87 BM and its solution conductivity corresponds to 1 : 2 electrolyte. 2.75 g of the complex solution was initially passed through a cation exchanger. The solution obtained after the process was reacted with excess of AgNO₃. The amount of AgCl formed in the above process is ____ g. (Nearest integer) [Given: Molar mass in g mol⁻¹ Cr : 52; Cl : 35.5, Ag : 108, O : 16]

A chromium complex with a formula CrCl3·6H2O has a spin only magnetic moment value of 3.87 BM and its solution

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Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be 1/30 of the molar conductivity of another weak acid HZ with concentration of 0.02 M. If λ°Q⁻ happened to be equal with λ°Z⁻, then the difference of the pKₐ values of the two weak acids (pKₐ(HQ) − pKₐ(HZ)) is ____ (Nearest integer). [Given: degree of dissociation (α) ≪ 1 for both weak acids, λ° : limiting molar conductivity of ions]

Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be 1/30 of the molar conductivity

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