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Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ? (The Bohr radius is represented by a0).
25 mL of a solution containing HCf and H2S04 required 10 mL of a 1 N NaOH solution for neutralization. 20 mL of the same acid mixture on being treated with an excess of AgNO3 gives 0.1425 g of AgCf. The normality of the HC and the normality of the H2S04 are respectively
If 10 gm of V2O5 is dissolved in acid and is reduced to V2+ by zinc metal, how many mole of I2 could be reduced by the resulting solution if it is further oxidised to VO2+ ions ?
[Assume no change in state of Zn2+ions] (V = 51, 0 = 16, I = 127) :
The percentage of copper in a copper(II) salt can be determined by using a thiosulphate titration. 0.305 gm of a copper(II) salt was dissolved in water and added to, an excess of potassium iodide solution liberating iodine according to the following equation
2Cu2 (aq) + 4I– (aq) 2CuI(s) + I2(aq)
The iodine liberated required 24.5cm3 of a 0.100 mole dm-3 solution of sodium thiosulphate
2S2032- (aq) + I2(aq) → 2I– (aq) + S4062- (aq)
the percentage of copper, by mass in the copper (ll) salt is. [Atomic mass of copper = 63.5]